Entries |
Document | Title | Date |
20080198069 | Fast Reacquisition of a GPS Signal - Upon reception of four GPS signals from GPS satellites and determining four pseudo ranges, along with ephemeris data previously stored in the GPS receiver, the location of the GPS receiver and real time clock time error is determined. The GPS receiver is in possession of four pseudo ranges and determines four unknown coordinate values (x, y, x, and time) identifying the location of the GPS receiver and real time clock error. The process of solving for four pseudo range formulas simultaneously with each pseudo range formula having an unknown “x”, “y”, “z”, and time coordinates of the GPS receiver, results in identification of the coordinates and time of the GPS receiver. In a similar process, the GPS receiver receiving four GPS signals from four GPS satellites is able to determine four pseudo ranges. Using the four pseudo ranges, four pseudo range equations unknown values for “x”, “y”, “z” and time can be solved for simultaneously. The resulting values are then used to verify that the calculated positions of the GPS satellites are within 0.5 ms of the previous solution. If the GPS satellites are within 0.5 ms range of the prior solution then the real time clock error is estimated. Thus, using ephemeris data, the location of the GPS receiver is determined in a fraction of the time it takes to acquire the GPS satellites using conventional approaches. | 08-21-2008 |
20080198070 | METHODS AND SYSTEMS FOR TEMPERATURE RELATED FREQUENCY DRIFT COMPENSATION - Systems and methods are provided that compensate for frequency drift due to temperature variation without the need for a temperature sensor. In one embodiment, a navigation receiver with an integrated communication device receives a base station reference signal, which is used to periodically calibrate a local oscillator frequency. In another embodiment, the calibrated local oscillator frequency drives a counter that is used to provide code phase estimation at the start of satellite signal acquisition. To provide temperature compensation in one embodiment, the calibrated local frequency is used to drive one or more counters at different calibration rates (i.e., different time intervals between calibrations). Count values from these counters are used to determine compensation for frequency drift due to temperature variation based on predicted frequency drift variation patterns between calibrations. This temperature compensation does not require a temperature sensor and further improves the accuracy of the code phase estimation. | 08-21-2008 |
20080204315 | System and Method For Monitoring and Surveying Movements of the Terrain, Large Infrastructures and Civil Building Works In General, Based Upon the Signals Transmitted by the Gps Navigation Satellite System - A measurement system for applications of monitoring and surveying based upon the signals transmitted by a GPS system includes a plurality of measurement stations equipped with at least one GPS receiver, one or more base stations for reception and processing of the measurements made by the plurality of measurement stations, and a network of communication between the stations. The GPS receiver is a receiver that works on a single carrier. The measurement stations are split into triangular sub-networks in which each vertex of a triangle contains a station. The base station is configured for calculating lengths of the baselines that join the measurement stations by means of the double differences, and the base station is configured for executing calculation of the solution in real time. | 08-28-2008 |
20080204316 | MEASUREMENT FAULT DETECTION - The present invention discloses a method and an apparatus for improving measurement fault detection in a sequential measurement processing estimator, and is particularly applied to Global Positioning Receivers. | 08-28-2008 |
20080211715 | GLOBAL POSITIONING SYSTEM USING BROADBAND NOISE REDUCTION - The present invention is directed to a global positioning system (GPS) having improved signal-to-noise ratio for reducing the required signal level for which GPS may be implemented in electronic devices or cell phones. The acquisition function of the GPS receiver is improved by inserting new signal processing for broadband noise reduction that allows subsequent improved estimation of critical time shift and frequency shift parameters needed for GPS acquisition at lower received signal levels. The decoding of the navigation bits from the satellite transmissions is improved to provide ephemeris data needed for computing navigation solutions at lower received signal levels, by examining the output of the same new signal processing for broadband noise reduction for spikes in the power of the output time series that correspond to navigation bit flips. | 09-04-2008 |
20080218410 | Always-on satellite positioning receiver - A method to establish a position of a device receiving an input signal containing data from a plurality of satellites is disclosed. The method generally includes the steps of (A) calculating (i) an estimated position of the device and (ii) an estimated velocity vector of the device, (B) calculating a plurality of estimated locations of a plurality of pseudo-random code sequences in the input signal based on (i) the estimated position and (ii) the estimated velocity vector and (C) generating the position in an output signal based on the pseudo-random code sequences. | 09-11-2008 |
20080224926 | Acquisition and Encoding of GPS Codes - A method for acquiring Global Positioning System (GPS) code includes describing GPS code as a Low Density Parity Check (LDPC) code, and decoding the LDPC code to achieve acquisition by directly solving for the correct code phase. | 09-18-2008 |
20080224927 | DIVERSITY MODULE BETWEEN GPS ANTENNAS, WITH RECEIVER PROTECTION AND INTEGRATED ALARM SIGNAL - The present Invention is about the Diversity Module Between GPS Antennas, with Receiver Protection and Integrated Alarm Signal ( | 09-18-2008 |
20080231508 | TIME-TO-FIRST-FIX FOR POSITION DETERMINATION - An improved time-to-first-fix (TTFF) for GPS systems is provided through a comparison of the time-of-week (TOW) to the sub-frame identification (ID). In one embodiment, this comparison comprises dividing the TOW to form a ratio and performing a modulus operation on the ratio to form a remainder, which is then incremented. If the incremented remainder equals the sub-frame ID, the TOW is assumed to be valid, thereby providing a time of transmission. The time of transmission may then be used to calculate pseudoranges and determine a receiver's location. | 09-25-2008 |
20080231509 | Gps Positioning Method and Gps Position Device - In the present invention, a conditional probability distribution function of received signal which is conditioned with a received signal amplitude (a), a pseudo range (p) and a navigation bit (b | 09-25-2008 |
20080231510 | Method of Determining a Gps Position Fix a Gps Receiver for the Same - A method of determining a GPS position fix comprising the steps of: (i) sampling received GPS signals and storing those samples; (ii) conducting preliminary processing of those GPS signal samples to determine the likelihood of being able to obtain a position fix during later, final processing of those GPS signal samples; and (iii) after step (ii), conducting final processing of those GPS signal samples to obtain a position fix. | 09-25-2008 |
20080238769 | GEOFENCING AND ROUTE ADHERENCE IN GLOBAL POSITIONING SYSTEM WITH SIGNALS FROM FEWER THAN THREE SATELLITES - When a global positioning system receiver receives signals from too few satellites to determine its position unambiguously, the receiver determines a solution surface as a set of possible locations determined from the signals received from the satellites. It then determines a minimum possible distance from a base location to that solution surface. If the base location is a geofence anchor, the receiver can determine whether a geofence crossing event has happened. If the base location is on a route, the receiver can determine whether it is following the route. A receiver with an ordinary clock can do so with signals from two satellites; a receiver with an extremely accurate clock can do so with a signal from one satellite. | 10-02-2008 |
20080246659 | Memory reduction in GNSS receiver - Radiolocalization receiver with a massively parallel array of correlators, comprising a data compression module ( | 10-09-2008 |
20080258969 | SYSTEM AND METHOD FOR COMPENSATING FOR TEMPERATURE EFFECTS ON GPS TRANSPONDERS - A GPS transponder system incorporating a phase error monitoring and compensation subsystem. The phase error monitoring and compensation subsystem includes a demodulator subsystem that demodulates modulated carrier signals being output from each one of a pair of GPS transponders to obtain the navigation codes being generated by each of the transponders from their respective carrier signals. The navigation codes obtained from the modulated carrier signals are compared to separate navigation codes that are generated by a navigation data unit (NDU) of the system and supplied over a thermally stable signal transmission line. The signal transmission line has a known, fixed delay and is not affected by temperature changes that affect the modulated carrier signals. A phase comparator subsystem uses the comparison to generate needed error correction signals that are applied via phase shifters to each of the transponders. The error correction signals modify the modulated carrier signals to remove the influence caused by temperature variations that the transponders experience during operation. | 10-23-2008 |
20080272961 | Determination of a relative position of a satellite signal receiver - For enhancing the quality of a relative positioning, a filter is adjusted depending on information on a movement of a satellite signal receiver. A position of the satellite signal receiver is determined relative to a reference station using the filter, wherein measurements on satellite signals received by the satellite signal receiver and measurements on satellite signals provided for the reference station are used as input to the filter. The measurements for the reference station may be received in messages which are assembled and provided for transmission and which may include in addition an indication of a current movement of the reference station. | 11-06-2008 |
20080297410 | Satellite receiver detachably combined to blue tooth handset - A satellite receiver detachably combined to a blue tooth handset comprises a blue tooth satellite receiver module including a blue tooth module, a central processing unit, satellite receiver module, a GPS satellite antenna, and a power control module; the satellite receiver module being coupled to the GPS satellite antenna for receiving signals and then decoding the signals; the decoded signals being transferred to the central processing unit to be processed and then sent digital data to the blue tooth module; a blue tooth handset including a blue tooth module, an auto-dialing transmission software unit, and a mobile phone module; the signals from the blue tooth module being received by the blue tooth module of the handset; then the signals received by the blue tooth module being transferred to the auto-dialing transmission software unit; and then the mobile phone module actuating a dialing mechanism for transferring message to a receiving end. | 12-04-2008 |
20080297411 | System and Method for GPS Signal Acquisition - A method for acquiring a GPS signal includes receiving a GPS signal portion over a coarse acquisition (C/A) frame period. The received GPS signal portion is stored and correlated to each of a plurality of versions of a reference coarse acquisition code to obtain a respective plurality of autocorrelation values. A peak value is selected among the autocorrelation values, the peak value corresponding to a version of the reference coarse acquisition code which is most aligned with the received GPS signal. | 12-04-2008 |
20080303714 | Compact single-aperture antenna and navigation system - An exemplary radio-based navigation system uses a single-aperture multimode direction-finding antenna capable of determining platform position, velocity, attitude, and time while simultaneously providing protection against narrowband and broadband sources of interference. Global Navigation Satellite System (GNSS)-signals such as those from the Global Positioning System (GPS) provide protection against jammers while simultaneously providing attitude measurements with a compact single-aperture multimode antenna (e.g., a small two-arm spiral with improved angle-of-arrival performance over the entire hemisphere enhanced through the use of a conductive vertical extension of the antenna ground plane about the antenna perimeter and/or conductive posts placed evenly around the antenna perimeter). The multimode spiral may be treated as an array of cylindrically symmetric antenna elements. GPS receiver correlation architecture also may be modified for attitude determination by increasing the requisite number of input signals from one to at least two while minimizing the required number of correlators and mixers. | 12-11-2008 |
20080316095 | COHERENT INTEGRATION ENHANCEMENT METHOD, POSITIONING METHOD, STORAGE MEDIUM, COHERENT INTEGRATION ENHANCEMENT CIRCUIT, POSITIONING CIRCUIT, AND ELECTRONIC INSTRUMENT - Integrated correlation values (I and Q integrated correlation values) between each of I and Q signals obtained from a received signal and a code replica are calculated by a coherent integration process performed by a correlation process circuit section | 12-25-2008 |
20080316096 | Method of Cross-Correlation and Continuous Wave Interference Suppression for GPS Signal and Associated GPS Receiver - A method for processing weak indoor signals in presence of cross-correlation or continuous wave interference and associated GPS receiver are provided. The method comprises providing a two-dimensional delay-Doppler accumulated power pattern comprising a plurality of accumulated powers corresponding to frequency and time; for a predetermined frequency, determining a partial average power value of accumulated powers of the two-dimensional delay-Doppler accumulated power pattern over a plurality of time points; and subtracting the partial average power value from the accumulated powers to generate a modified delay-Doppler accumulated power pattern with suppressed interference effect. | 12-25-2008 |
20090002228 | PORTABLE TERMINAL - According to one embodiment, a portable terminal includes: a display unit that displays a present location of the portable terminal; a GPS receiver that calculates theoretical precision data determined theoretically by geometric arrangement of plural GPS satellites on the basis of location information of the GPS satellites, and performs a positioning process by which positioning data for indicating the present location of the portable terminal is calculated using arrival time of the radio wave; and a control unit that repeats the positioning process performed by the GPS receiver plural times to calculate a cumulative average of the positioning data, and calculates a difference between the cumulative average of the theoretical precision data and the cumulative average of the positioning data to display a cumulative average of the positioning data, when the difference equal to or less than a predetermined value successively continues predetermined number of times, as the present location of the portable terminal. | 01-01-2009 |
20090002229 | ANTENNA ELEMENT AND ANTENNA UNIT CAPABLE OF RECEIVING TWO KINDS OF RADIO WAVES - An antenna element includes a dielectric board, a first antenna radiation electrode formed on a top surface of the dielectric board at an outer region, a second antenna radiation electrode formed on the top surface of the dielectric board at a central portion, a ground electrode formed on a bottom surface of the dielectric board, a feeding pattern formed on the side surface of the dielectric board for feeding to the first antenna radiation electrode by electromagnetic coupling, and a feeding pin having an end connected to the second antenna radiation electrode. A combination of the first antenna radiation electrode, the ground electrode, and the feeding pattern serves as a first antenna portion for receiving a first radio wave. A combination of the second antenna radiation electrode, the ground electrode, and the feeding pin serves as a second antenna portion for receiving a second radio wave. | 01-01-2009 |
20090002230 | PSEUDOLITE-BASED PRECISE POSITIONING SYSTEM WITH SYNCHRONISED PSEUDOLITES - Pseudolite-based precise positioning system with synchronised pseudolites that can compute the position of a mobile station with slave pseudolites synchronised to master pseudolite is provided. Therefore pseudolite-based precise positioning system according to present invention does not need correction information of a reference station. A pseudolite-based precise positioning system for computing the position of a mobile station without correction information of a reference station, the pseudolite-based precise positioning system includes: master pseudolite with reference clock of the positioning system; at least one slave pseudolite having digitally controlled numerical controlled oscillator means; mobile station computing the position of itself based on the clock-synchronised signal from the master pseudolite and the slave pseudolite without correction information of a reference station; and clock synchronisation loop filter means having the digitally controlled numerical controlled oscillator means synchronise the clock of the slave pseudolite to the clock of the master pseudolite by transmitting synchronisation information U | 01-01-2009 |
20090021427 | RECEIVER AND RELATED METHOD FOR SYNCHRONIZING DATA SEGMENTS BY COMPARING REFERENCE TIME DATA AND TIME INFORMATION CARRIED BY DATA SEGMENTS - A method for synchronizing data segments transmitted by a Global Navigation Satellite System (GNSS) signal is disclosed. Each of the data segments has a plurality of data units including a data unit, which contains a plurality of bit positions defined for carrying time information. The method comprises: identifying a specific data unit from a specific data segment; and comparing a reference time data with a plurality of bits of the specific data unit at the bit positions to synchronize the data segments in the GNSS signal. | 01-22-2009 |
20090021428 | Signal Processor and Signal Processing Method - Signal processor for a GNSS receiver, in particular a GPS receiver, characterized by the use of un-refreshed volatile dynamic memory as a storage element for real-time digital data. The invention takes advantage from the facts that many memory units are used to store real-time data and are constantly overwritten at a rate which can conveniently shorter than a mean retention time of a DRAM cell. Moreover several memories are used to store noise-dominated data which are then statistically analyzed in a way can tolerate a small rate of retention errors. Thus the automatic refresh circuitry can be disposed of without adverse effect. | 01-22-2009 |
20090027264 | Gnss Signal Processing Methods and Apparatus - Methods and apparatus for processing of data from a network of GNSS reference stations are presented. An ionosphere-free, federated geometry filter is employed so that computation time increases only linearly with the increase in number of reference stations, significantly reducing processing time as compared to a centralized filter approach. | 01-29-2009 |
20090033554 | Time Adjustment Device, Timekeeping Device with a Time Adjustment Device, and a Time Adjustment Method - A time adjustment device has a satellite signal reception unit that receives satellite signals transmitted segmented into segments from a positioning information satellite; a time information acquisition unit that acquires time information from the satellite signal; a segment identifier acquisition unit that acquires a segment identifier for the segment containing the time information; a corresponding identifier calculation unit that calculates a corresponding segment identifier that corresponds to the segment identifier based on the time information; and a segment identifier evaluation unit that determines if the segment identifier is correct based on the segment identifier and the corresponding segment identifier. | 02-05-2009 |
20090040103 | Control and features for satellite positioning system receivers - Control and feature systems for processing signals from a satellite positioning system include an expert system receiver manager; a joint detection, carrier centering and bit sync acquisition subsystem; peak detection; a multi-dimensional measurement interpolation subsystem; a subsystem for mode switching between a navigational signal; and power control module for a receiver. | 02-12-2009 |
20090058722 | REGIONAL SATELLITE POSITIONING SUPPLEMENTARY SYSTEM - Systems and methods for a navigation satellite of a satellite positioning supplementary system are provided in which a unit generates a navigation signal with a signal strength being dimensioned in such a way that it is still possible to receive signals of other satellite navigation systems. | 03-05-2009 |
20090066572 | POSITIONING APPARATUS - A positioning apparatus and a point positioning method which estimated with high accuracy with only one linear regression equation is provided. The positioning apparatus ( | 03-12-2009 |
20090066573 | RADIO SIGNAL-BASED POSITIONING DEVICE AND METHOD - A radio signal-based positioning device includes a receiver that receives a plurality of radio-transmitted positioning signals, a frequency determiner that determines a frequency of each of the plurality of positioning signals, a send time determiner that determines a send time of each of the plurality of positioning signals, and an evaluation unit that determines a position location from the determined frequencies and send times of the plurality of positioning signals. | 03-12-2009 |
20090066574 | ARRANGEMENTS FOR SATELLITE-BASED NAVIGATION AND METHODS THEREFOR - Various systems, methods and devices are implemented for processing received signals. Consistent with one such embodiment, a method is implemented for use in a signal-communication receiver having a carrier-tracking loop and a processor for operating adaptive algorithms. The method involves interpreting a received signal using space time adaptive processing (STAP). A convergence speed of the adaptive algorithms is set based on a noise bandwidth of a phase-locked loop (PLL) in the carrier-tracking loop. A carrier-phase de-rotation constraint is implemented into weight parameters of the STAP to preserve spatial and temporal degrees of freedom in the STAP. | 03-12-2009 |
20090066575 | Positioning apparatus and positioning method - A positioning apparatus includes: a position computing part configured to receive signals from a plurality of radio transmitters to compute a position of the positioning apparatus; a reception status determining part configured to determine a reception state of the signals from the plurality of the radio transmitters; and an intermittent drive setting part configured to set a time interval for receiving signals by the position computing part according to the reception state determined by the reception status determining part. | 03-12-2009 |
20090073037 | GPS PROCESSING ARRANGEMENT - A software GPS processing arrangement comprising a FIFO buffer for receiving a stream of the GPS signal samples, a memory, a DMA controller for transferring the GPS signal samples from the FIFO buffer to the memory, a CPU running GPS signal processing software configured to retrieve the GPS signal samples from the memory and process them to obtain a position fix, and a counter operating independently of the DMA controller and the CPU for keeping count of the number of streamed GPS signal samples. | 03-19-2009 |
20090073038 | POSITIONING DEVICE, POSITIONING CONTROL METHOD, AND RECORDING MEDIUM - A positioning device includes a phase calculation section which performs a correlation process of a specific positioning base code replica and a positioning base code from a specific transmission source to calculate a present phase of the positioning base code, an estimated phase calculation section which calculates an estimated phase when estimating the present phase based on the phase used for preceding positioning, a Doppler shift of a frequency of a radio wave carrying the positioning base code, and an elapsed time from the preceding positioning, a phase difference evaluation section which determines whether or not a phase difference between the calculated present phase and the estimated phase is within a phase difference allowable range specified in advance, and a positioning section which locates a present position using the phase within the phase difference allowable range. | 03-19-2009 |
20090073039 | Satellite Ephemeris Error - A method of compensating for or correcting satellite ephemeris error involves measuring time difference of arrival (TDOA) and frequency difference of arrival (FDOA) for signal replicas received via two satellites ( | 03-19-2009 |
20090079626 | POSITIONING APPARATUS AND POSITIONING APPARATUS CONTROL METHOD - The positioning apparatus and position apparatus control method are able to efficiently receive useful signals without special circuitry. Positioning apparatus | 03-26-2009 |
20090079627 | High Sensitivity GPS Receiver - A high sensitivity GPS receiver includes an acquisition engine and a tracking engine. The acquisition engine processes GPS satellite data at data rate that is substantially equal to twice the coarse acquisition (CA) code chip rate. This data rate advantageously enables the acquisition engine to process GPS satellite data with relatively less hardware area than traditional GPS acquisition approaches. In one embodiment, the high efficiency acquisition engine may be over-clocked, thereby allowing different phases of a CA code to be correlated quickly. The tracking engine can advantageously processes GPS satellite data at a data rate that does not have an integer relationship to the CA code chip rate. | 03-26-2009 |
20090091495 | GPS RECEIVER RAIM WITH SLAVED PRECISION CLOCK - A method and a system for providing a substituted timing signal for a missing satellite ephemeris in execution of a RAIM algorithm includes deriving a plurality of position, velocity, and time solutions from a GPS navigation system. The position, velocity and time solutions are derived from a plurality of satellite ephemerides. An atomic clock provides an atomic clock signal. The atomic clock signal is compared to the derived time solutions to arrive at a correction factor. The atomic clock signal is adjusted according to the correction factor to develop an adjusted atomic clock signal. The adjusted atomic clock signal is substituted for a missing satellite ephemeris to execute the RAIM algorithm. | 04-09-2009 |
20090091496 | GNSS RECEIVER AND EXTERNAL STORAGE DEVICE SYSTEM AND GNSS DATA PROCESSING METHOD - A GNSS system includes a receiver connected to an external mass storage device. Applications for the system, including GNSS data processing methods are also disclosed. The external storage device can comprise a flash (thumb) drive, which can be connected to the receiver via a USB interconnection. | 04-09-2009 |
20090096668 | SIGNAL ACQUISITION/TRACKING METHOD AND CORRELATOR FOR THE SAME - A Doppler frequency searching method and correlator are disclosed. In the present invention, before Doppler frequency removal, a received signal is converted into digital form and the spreading code is removed. Then the signal is down-sampled to have a low sampling rate, which can be determined according to the maximum Doppler frequency to be searched. The Doppler frequency searching is done by stages. Each stage is in charge of a portion of the Doppler frequency to be removed. The sampling rate can be further reduced in each stage. Each stage can have a plurality of Doppler frequency removal units sharing the portion of Doppler frequency that the stage is to remove. Power consumption is reduced since Doppler frequency removal is executed with low sampling rate. | 04-16-2009 |
20090096669 | MULTIPATH MITIGATION USING SENSORS - Systems, methods and devices for multipath mitigation are presented. Specifically, embodiments of the invention can advantageously use sensor input to mitigate the effect of multipath signals received at a receiver. The use of physical sensors in navigation systems is deemed particularly advantageous. | 04-16-2009 |
20090096670 | POSITIONING METHOD, PROGRAM, POSITIONING DEVICE, AND ELECTRONIC APPARATUS - A positioning method includes: capturing a satellite signal from a positioning satellite; predicting a state vector including a position of a positioning device and a velocity of the positioning device based on the satellite signal; predicting a first distance-equivalent value indicating a distance between the positioning satellite and the positioning device; measuring a second distance-equivalent value indicating a distance between the positioning satellite and the positioning device; calculating an observed value indicating a difference between the first distance-equivalent value and the second distance-equivalent value; setting a measurement error for the positioning satellite based on a signal strength of the satellite signal; changing the measurement error based on a capture data indicating a data of capturing of the satellite signal; and correcting the state vector using the observed value, and the changed measurement error. | 04-16-2009 |
20090096671 | POSITIONING METHOD, PROGRAM, POSITIONING DEVICE, AND ELECTRONIC APPARATUS - A positioning method includes: determining a receiving environment of a satellite signal from a positioning satellite; predicting a state vector including a position of a positioning device and a velocity of the positioning device based on the satellite signal; predicting a first distance-equivalent value indicating a distance between the positioning satellite and the positioning device; measuring a second distance-equivalent value indicating a distance between the positioning satellite and the positioning device; calculating an observed value indicating a difference between the first distance-equivalent value and the second distance-equivalent value; setting a first measurement error for the positioning satellite based on a signal strength of the satellite signal; setting a suitability condition of the observed value based on the receiving environment; setting a second measurement error larger than the first measurement error when the observed value is not suitable by the suitability condition; and correcting the state vector using the observed value and the second measurement error. | 04-16-2009 |
20090096672 | POSITION DETERMINATION METHOD, POSITIONING DEVICE, AND ELECTRONIC INSTRUMENT - A position determination method includes: performing a positioning process that calculates a located position by performing positioning calculations using satellite signals; determining whether or not a convergence condition is satisfied based on current and preceding positioning results when the positioning process is performed, the convergence condition being specified as a condition for determining whether or not the positioning results of the repeated positioning processes have converged; and determining the located position calculated by the current positioning process to be an output position when the convergence condition is satisfied. | 04-16-2009 |
20090102714 | GNSS post positioning with selected precision - A computer apparatus for post positioning with a selected precision. The apparatus includes a GNSS post processor to post process reference GNSS carrier phases from a reference system and rover GNSS carrier phases from a rover receiver to compute a secure position for the rover receiver not available to a user. The apparatus includes a vector offset generator to use the selected precision to compute a dither level for offset vectors to degrade an intrinsic precision of the secure position to provide a user-available position for the rover receiver at the selected precision. | 04-23-2009 |
20090109090 | POSITION DETERMINATION WITH REFERENCE DATA OUTAGE - Position determination at a rover station on the basis of positioning signals from a plurality of positioning satellites. During normal operation a position of the rover station is determined on the basis of the positioning signal from the positioning satellites and reference data received via a separate connection from a reference station. Upon detecting an outage of the reference data from the reference station, error data at least including satellite clock drifts is obtained from error data transmitter and applied in the determination process in order to eliminate positioning errors introduced by satellite clock drifts that cannot be compensated on the basis of the reference data due to the outage. | 04-30-2009 |
20090109091 | GLOBAL NAVIGATION SATELLITE SYSTEM RECEIVER AND METHOD OF OPERATION - A system and method of operating a Global Navigation Satellite System (GNSS) receiver is disclosed, by receiving a plurality of navigation signals, operating the receiver in a first mode and operating the receiver in a second mode, each of the first navigation signals is a signal transmitted from a respective space vehicle and includes a respective sequence of navigation messages, each navigation message includes data indicative of at least a position of the respective space vehicle. | 04-30-2009 |
20090115658 | DISTRIBUTED RADIO FREQUENCY RANGING SIGNAL RECEIVER FOR NAVIGATION OR POSITION DETERMINATION - In a local positioning system, a receiver is adapted for receiving signals from a land-based transmitter. The receiver includes an analog decorrelator for decorrelating the transmitted spread spectrum signals. A down converter connected with an antenna may be spaced away from other portions of the receiver. The down converter down converts received ranging signals and provides them to the remotely spaced receiver portions. A signal line connecting the down converter to the receiver may be operable to transmit any two or more of a reference signal provided to the down converter, the down converted intermediate frequency signals provided to the receiver, and power provided to the down converter. The receiver may be positioned adjacent to or as part of a land-based transmitter. By determining positions of two or more antennas, the location of the associated transmitter is determined. | 05-07-2009 |
20090115659 | Receiver device for satellite positioning system - A receiver device has a plurality of signal reception processing circuits, which processes GPS positioning signals of different carrier wave frequencies received by an antenna. In the receiver device, the positioning signals are converted into intermediate frequency signals in a first stage, which includes phase shifters, mixers and complex filters. The receiver device further has dividers of frequency-dividing ratios, which are set variably in accordance with the carrier wave frequencies in the respective signal reception processing circuits. By changing the frequency-dividing ratios, the receiver device can be adapted to receive other positioning signals. | 05-07-2009 |
20090121932 | MULTI-ANTENNA GNSS POSITIONING METHOD AND SYSTEM - A multi-antenna GNSS system and method provide earth-referenced GNSS heading and position solutions. The system and method compensate for partial blocking of the antennas by using a known attitude or orientation of the structure, which can be determined by an orientation device or with GNSS measurements. Multiple receiver units can optionally be provided and can share a common clock signal for processing multiple GNSS signals in unison. The system can optionally be installed on fixed or slow-moving structures, such as dams and marine vessels, and on mobile structures such as terrestrial vehicles and aircraft. | 05-14-2009 |
20090128406 | METHOD AND APPARATUS FOR NAVIGATION SYSTEMS - The invention relates to navigation systems and elements. A network element (M) includes a controlling element (M. | 05-21-2009 |
20090128407 | Systems and Methods for Detecting GPS Measurement Errors - Systems and methods for detecting global positioning system (GPS) measurement errors are provided. In this regard, a representative system, among others, includes a navigation device that is configured to receive GPS signals from signal sources, the navigation device being configured to calculate pseudoranges (PRs) and delta ranges (DRs) based on the received GPS signals, the navigation device including a consistency check algorithm that is configured to: determine mismatches between the respective calculated PRs and DRs, and indicate that an error exists in the respective calculated PRs and DRs based on their mismatch and mismatch accumulations. This algorithm can be independent of navigation state and is capable of detecting slow-changing errors. | 05-21-2009 |
20090135060 | GPS System Utilizing Multiple Antennas - A GPS Mobile Unit is described. The GPS Mobile Unit may include at least two antennas, at least two GPS receivers, and a position solution module in signal communication with the at least two GPS receivers. | 05-28-2009 |
20090140919 | POSITION/TIME DETECTING APPARATUS AND TIMEPIECE INCLUDING THE APPARATUS - The number of GPS satellites from which radio waves are received and the intensities of radio waves received from the GPS satellites are acquired. In a first state in which radio waves of a first signal intensity are received from four GPS satellites in a first predetermined time, orbit/time information are acquired from the respective GPS satellites. The time information indicates a radio-wave emission GMT clock time at the satellite when the radio waves were emitted from the satellite. In a second state in which radio waves of a second signal intensity lower than the first intensity are received from one or more GPS satellites within a second time longer than the first predetermined time, the time information is acquired from the respective GPS satellites. In the first state, a current time and a current position of the GPS timepiece is calculated based on the time/orbit information. In the second state, a current time is calculated based on the time information. | 06-04-2009 |
20090146880 | METHOD AND APPARTUS FOR REDUCING INTERFERENCE IN A WIRELESS DEVICE - A method of reducing interference in a GPS-equipped wireless device having a transmitter, the method comprising: acquiring a GPS signal containing GPS data; decoding the GPS data; determining whether the GPS data is valid; when the GPS data is not valid due to the interference, determining a transmit power level of the transmitter; and when the transmit power is not zero, reducing the transmit power level by one step. | 06-11-2009 |
20090153396 | System and Method for Using GPS Interferometry to Determine Atmospheric Conditions - A method and system for determining a bending angle and/or the presence of atmospheric ducting. An array of antennas is used in order to form an interferometer. The interferometer receives signals from GPS satellites and uses the index of infraction in order to determine a bending angle of the GPS signals and/or the presence of atmospheric ducting. | 06-18-2009 |
20090153397 | GNSS SATELLITE SIGNAL INTERFERENCE HANDLING METHOD AND CORRELATOR IMPLEMENTING THE SAME - A GNSS satellite signal handling method is disclosed. For a specific Doppler bin, when a peak is found, it is checked if the specific Doppler bin is polluted with interference by detection. If the detection result indicates that the specific Doppler bin is polluted with interference, a threshold, which is used to determine whether the actual signal peak is found or not, is then raised to a higher level, so as to increase the searching reliability. To detect interference, it is determined whether the specific Doppler bin is polluted by comparing a statistical value of correlation results of a plurality of code chip hypotheses with a reference or by checking if there are plural peaks existing in the power spectrum. | 06-18-2009 |
20090153398 | METHOD AND APPARATUS FOR CALIBRATING A GLOBAL POSITIONING SYSTEM OSCILLATOR | 06-18-2009 |
20090153399 | METHOD AND APPARATUS FOR PROCESSING SATELLITE POSITIONING SYSTEM SIGNALS - Method and apparatus for processing a satellite positioning system (SPS) signal is described. In one example, a timing reference related to a SPS time of day is obtained from a wireless communication signal received by a mobile receiver. A bias in a local clock of the mobile receiver with respect to a frame timing of a repeating code broadcast by the satellite is compensated for in response to the timing reference. An expected code delay window is obtained for the SPS signal at the mobile receiver. The SPS signal is correlated with a reference code within the expected code delay window. In another example, an expected code delay window is obtained at the mobile receiver. The mobile receiver selects a sampling resolution in response to a size of the expected code delay window. The SPS signal is sampled at the selected sampling resolution and then correlated with a reference code. | 06-18-2009 |
20090160704 | NAVIGATION RECEIVER - The subject matter disclosed herein relates to a system and method for processing navigation signals received from multiple global navigation satellite systems (GNSS′). In a particular implementation, signals received from multiple GNSS′ may be processed in a single receiver channel. | 06-25-2009 |
20090160705 | TimeKeeping Device and Satellite Signal Reception Method for a Timekeeping Device - A timekeeping device has a reception unit that captures a positioning information satellite and receives satellite signals transmitted from the captured positioning information satellite, a time information generating unit that generates time information based on the satellite signal received by the reception unit, a time display unit that displays time information, and a reception control unit that controls the reception unit. The reception control unit includes a satellite capture control unit that controls the reception unit to run the positioning information satellite capture process, a signal condition detection unit that detects the signal condition of the captured positioning information satellite, a decoding control unit that controls the reception unit to apply a decoding process to the satellite signal transmitted from the captured positioning information satellite, and a reception channel setting unit that sets the reception unit to a single satellite mode or a multi-channel mode based on the signal condition detected by the signal condition detection unit, and the reception unit sets the number of positioning information satellites that can be simultaneously captured and decoded to 1 when set to the single satellite mode, and sets the number of positioning information satellites that can be simultaneously captured and decoded to more than 1 when set to the multi-channel mode. | 06-25-2009 |
20090167601 | GPS Baseband Architecture - A GPS baseband architecture provides flexibility and power consumption and chip area usage advantages. The GPS baseband architecture includes a first stage having a preamplifier coupled to a low noise amplifier, which is coupled to a mixer. A PLL provides the mixer with a frequency to convert a signal to a higher intermediate (IF) frequency. The output of the mixer is fed to a poly-phase filter. The output of the poly-phase filter is fed to a programmable gain amplifier (PGA), whose output is fed to an analog-to-digital converter (ADC) to produce an output GPS signal. A saturation bit of the ADC is used to control the PGA through a digital amplifier gain control (AGC) circuit. | 07-02-2009 |
20090167602 | SIGNAL ACQUIRING METHOD OF GPS RECEIVER AND DIGITAL CAMERA THEREOF - A signal acquiring method of a GPS receiver and a digital camera thereof, suitable for accelerating a signal acquiring speed of the GPS receiver, are described. The signal acquiring method includes the following steps receiving a plurality of satellite signals; performing a discrete cosine transform (DCT) demodulation procedure, so as to parse a receiving time base of the satellite signals; next, transforming the satellite signals into a code information and a navigation frequency according to the receiving time base of the satellite signals; then, performing a correlation correction procedure to acquire a navigation information from the satellite signals according to the code information and the navigation frequency; which thus accelerates the processing speed on the signal acquiring flow through calculation characteristics of the DCT. | 07-02-2009 |
20090167603 | POSITIONING METHOD, COMPUTER PROGRAM, POSITIONING DEVICE, AND ELECTRONIC APPARATUS - A positioning method in a positioning device that calculates a location of the positioning device by executing Kalman filtering includes, acquiring a satellite signal from a positioning satellite; predicting a state vector including a velocity component of the positioning device, and error covariance of the state vector; correcting the velocity component using a difference between a measured value and a predicted value of the reception signal frequency from the positioning satellite; determining accuracy of the corrected velocity component based on the error covariance; setting a velocity condition based on the determined accuracy; judging a moving state of the positioning device by comparing the corrected velocity component and the velocity condition; and calculating the location by executing the Kalman filtering with a filter characteristic changed according to the judged moving state. | 07-02-2009 |
20090174600 | SYSTEM AND METHOD FOR DETERMINING THE GEOGRAPHIC LOCATION OF A DEVICE - A method and apparatus for estimating a location of a device. For each of a plurality of locations of a device, a set of positional data is determined from signals received from a plurality of satellites. The positional data is filtered and compared with data from a road network database. This comparison may be a function of a distance from at least one point defined by a set of the filtered positional data to a road in the road network database and an angle between a line representing a best fit for plural points defined by corresponding plural sets of the filtered positional data to a line defined by a road in the road network database. | 07-09-2009 |
20090184873 | POSITIONING METHOD, PROGRAM THEREOF, AND POSITIONING DEVICE - A positioning method includes (a) adding cumulatively each of an I component and a Q component of a received signal of a positioning signal per polarity, the positioning signal being spread-modulated with a spread code reversed in polarity by a navigation data, (b) calculating sum of squares of the results of the cumulative addition in step (a), (c) executing correlation calculation of the sum of squares calculated in step (b) with a replica code of the spread code, and (d) executing predetermined positioning calculation based on the result of the correlation calculation in step (c) to perform positioning of the present location. | 07-23-2009 |
20090189808 | GNSS DATA/PILOT CORRELATOR AND CODE GENERATOR THEREOF - A correlator for a GNSS receiver and a code generator used in the correlator as well as a correlation method are disclosed. In the GNSS, each satellite transmits a data signal and a pilot signal. The correlator is adaptable for executing correlation to the data signal, the pilot signal and various combinations thereof, such as non-coherent and coherent combinations. The code generator generates primary ranging codes of the data and pilot signals as well as various combinations thereof, such as sum or difference of the primary ranging codes of the data and pilot signals. By using the various codes, the correlator is adaptable and flexible for different correlation requirements. | 07-30-2009 |
20090189809 | Satellite Signal Reception Device And Control Method For A Satellite Signal Reception Device - A satellite signal reception device has a reception unit that receives a satellite signal transmitted from a positioning information satellite, a reception state display device for displaying the satellite signal reception state, a reception state evaluation unit that determines the reception condition of the satellite signal received by the reception unit, and a display controller that controls the reception state display device to display the reception condition determined by the reception state evaluation unit. The reception state evaluation unit determining the level of the reception condition based on the number of positioning information satellites from which satellite signals are received and the signal level of each received signal, and the display controller displaying the reception level output by the reception state evaluation unit on the reception state display device. | 07-30-2009 |
20090195450 | GNSS RECEIVER AND METHOD FOR GNSS MEMORY CODE GENERATION - The invention provides a Global Navigation Satellite System (GNSS) receiver. In one embodiment, the GNSS receiver comprises a memory, a buffer, a correlator, and a selector. The memory stores a memory code and outputs a portion of the memory code as a first code segment. The buffer comprises a plurality of component buffers and stores the first code segment into one of the component buffers in order. The selector selects a portion of the first code segments stored in the buffer as a second code segment output to the correlator according to the code phase selection signal, wherein the data length of the second code segment is equal to a correlation data length of the correlator. The correlator calculates a correlation between a received GNSS signal with the correlation data length and the second code segment. | 08-06-2009 |
20090201202 | RECEIVER FOR RADIO POSITIONING SIGNALS - A GPS or Galileo receiver for radio positioning signals wherein at least a part of the computing of position related data based on radio signals received from a plurality of space vehicles is carried out by a processor ( | 08-13-2009 |
20090201203 | ANTENNA ALIGNMENT AND MONITORING SYSTEM AND METHOD USING GNSS - An antenna alignment and monitoring system is provided for telecom antennas and includes a pair of global navigation satellite system (GNSS) antennas mounted on a printed circuit board (PCB) for installation in a telecom antenna enclosure. Multiple telecom antennas are configured in an antenna array for mounting on a transmission tower or other elevated structure. A common GNSS receiver cycles among the GNSS antenna pairs for initially aligning and subsequently monitoring the azimuth alignment of the telecom antennas relative to a reference azimuth using GNSS triangulation. | 08-13-2009 |
20090207075 | Sample decimation in a GNSS receiver - Embodiments of the present invention recite a method and system for processing Global Navigation Satellite System (GNSS) signals. In one embodiment, at least one wide-band Radio Frequency (R/F) filter of a signal processing pathway is utilized to pass a plurality of signals from a plurality of satellite navigation systems as a combined signal set. The plurality of signals of the plurality of satellite navigation systems is split based upon the respective frequency of each of the plurality of signals to facilitate reducing the clock rate used to subsequently process each of the plurality of signals. | 08-20-2009 |
20090213005 | SYSTEMS AND METHODS FOR A HIGH-PRECISION TIME OF ARRIVAL ULTRA-WIDEBAND POSITIONING SYSTEM - Systems and methods for a high-precision time of arrival ultra-wideband positioning system are provided. In one embodiment, a method for generating precision localizer messages for an ultra-wideband time-of-arrival positioning system is provided. The method comprises receiving a signal from an atomically accurate reference, generating a timing signal based on the atomically accurate reference signal, correcting a system time based on the timing signal when an error is detected, and transmitting an ultra-wideband signal having a localization message based on the system time. | 08-27-2009 |
20090213006 | GNSS RECEIVER WITH REDUCED STORAGE REQUIREMENTS - A Global Navigation Satellite System (GNSS) receiver provided according to an aspect of the present invention contains a buffer to store less than a number of samples spanning a code period of a received GNSS signal, with the samples being used by a correlator and a processor to perform various searches in the receiver. Due to the use of such smaller memory space in the buffer, the overall size of receivers may be reduced. According to another aspect of the present invention, the amount of storage provided for storing local code and carrier samples (used during correlation) is also reduced by dynamically generating the local code and carrier sample as required for generating partial correlation results. | 08-27-2009 |
20090219201 | GNSS RECEIVER WITH ENHANCED ACCURACY USING TWO SIGNAL CARRIERS - A satellite positioning receiver is disclosed having at least one receive channel. Each receive channel is intended to perform a combined processing of a first S | 09-03-2009 |
20090219202 | Satellite Time Determination for SPS Receiver - Methods and apparatus for improving position location performance, especially in weak coverage areas, are described herein. A SPS receiver is able to solve for position location in situations where at least two satellite signals can be received but only one time stamp can be successfully demodulated. The receiver can utilize the successfully decoded time reference to determine a time associated with bit edge transitions for signals from that satellite. The receiver utilizes the bit edge transition with the known time to set the time for at least one bit edge transition for signals from other satellites for which the time stamp is not demodulated. The receiver sets the time hypothesis to bit edge transitions occurring within a predetermined window including the bit edge transition with the known time. A position can be determined based on the time hypothesis. The time hypothesis and window placement can be modified following invalid position solutions. | 09-03-2009 |
20090219203 | METHOD AND APPARATUS FOR COMBINING MEASUREMENTS AND DETERMINING CLOCK OFFSETS BETWEEN DIFFERENT GLOBAL NAVIGATION SATELLITE SYSTEMS - Method and apparatus for processing satellite signals from a first satellite navigation system and a second satellite navigation system is described. In one example, at least one first pseudorange between a satellite signal receiver and at least one satellite of the first satellite navigation system is measured. At least one second pseudorange between the satellite signal receiver and at least one satellite of the second satellite navigation system is measured. A first difference between a first time reference frame of the first satellite navigation system and a time reference and a second difference between a second time reference frame of the second satellite navigation system and the time reference are obtained. The at least one first pseudorange and the at least one second pseudorange are combined using the first and second differences in time references. | 09-03-2009 |
20090219204 | DUAL MODE SATELLITE SIGNAL RECEIVER AND METHOD THEREOF - A dual mode satellite signal receiver capable of supporting at least two global navigation satellite systems and a satellite signal receiving method are provided. The dual mode satellite signal receiver comprises a frequency synthesizer for generating a local oscillator signal based on a reference frequency; a mixer for mixing the local oscillator signal with a satellite signal and outputting the mixed signal as a signal of an intermediate frequency band; a first filter for filtering the signal output from the mixer to reject an image signal and output only an actual signal; a second filter for filtering the actual signal to output only a predetermined bandwidth according to a positioning mode; and an amplifier for amplifying the second filter output signal to a predetermined level and outputting the amplified signal. | 09-03-2009 |
20090237301 | TERMINAL DEVICE, METHOD OF CONTROLLING TERMINAL DEVICE, AND RECORDING MEDIUM - A terminal device searches for a satellite signal by performing a correlation process over a predetermined first accumulation time within a predetermined frequency range in units of search frequencies at specific intervals. When the terminal device has failed in searching for the satellite signal, the terminal device searches for the satellite signal by performing the correlation process over a predetermined second accumulation time longer than the first accumulation time at the search frequency and frequencies differing from the search frequency by a specific frequency which is less than the interval of the search frequencies and specified based on a drift of a reference oscillator of the terminal device within the second accumulation time. The terminal device determines a search result of the satellite signal based on a search result at the search frequency and search results at the frequencies differing from the search frequency by the specific frequency. | 09-24-2009 |
20090243927 | Method for estimating hidden channel parameters of a GNSS navigation signal received in a multipath environment - For the reduction of the multipath error of received GNSS navigation signals, a sequential Bayesian estimation is used, with a movement model forming the basis of the estimation, which model is designed especially for dynamic channel scenarios and takes into account the speeds of change and the variable life cycles of the path. The estimator is implemented as a recursive Bayesian filter for a combined determination of positions and suppression of multipaths. The binding of the delay of the direct path is taken into consideration via position and clock parameters. Application with GNSS satellite navigation receivers, e.g. GPS and Galileo. | 10-01-2009 |
20090243928 | INFORMATION PROCESSING APPARATUS, POSITION ESTIMATING METHOD, PROGRAM, ARTIFICIAL SATELLITE SYSTEM - There is provided an information processing apparatus arranged with a satellite position estimating section for estimating a position of an artificial satellite at an arbitrary time by substituting the arbitrary time to an estimate equation of the position of the artificial satellite represented by a sum of one, or two or more periodic functional arguments. | 10-01-2009 |
20090256744 | CIRCUIT FOR EXCLUSION ZONE COMPLIANCE - A circuit for exclusion zone compliance is recited. In one embodiment, the circuit comprises a satellite navigation signal reception component configured for receiving at least one signal from at least one Global Navigation Satellite System satellite and a navigation data deriving component configured for deriving position data and a clock time from the at least one signal. The circuit further comprises a non-volatile memory component configured for storing an encrypted data set describing the boundaries of an exclusion zone and a data blocking component configured for controlling the accessing of the encrypted data set. The circuit further comprises a data control component configured for blocking the output of a signal from the circuit in response an indication selected from the group consisting of: an indication that the circuit is located within an exclusion zone and an indication that output of said signal is not permitted based upon said clock time. | 10-15-2009 |
20090256745 | System and/or Method for Obtaining a Time Reference for a Received SPS Signal - The subject matter disclosed herein relates to a system and method for obtaining time references for signals received from transmitters in a satellite and/or terrestrial navigation system. | 10-15-2009 |
20090262017 | SYSTEMS AND METHODS FOR FAST GNSS SIGNALS ACQUISITION - Systems and methods for acquiring global navigation satellite system (GNSS) signals. An incoming signal is multiplied with a time shifted spreading code replica and converted to zero (or very low) nominal frequency. The converted signal is filtered and downsampled by a large scale. A signal power metric and frequency offset are then determined. This is performed over multiple slices. Fast acquisition is achieved by parallel concatenation of numerous slices. | 10-22-2009 |
20090262018 | High Accuracy Satellite Receiving Controller and Associated Method - A high accuracy satellite signal receiving controller and associated method is provided. The high accuracy satellite signal receiving controller includes a frequency synthesizer, and an analog-to-digital converter (ADC), a Global Positioning System (GPS) receiving module and a control unit. The frequency synthesizer, coupled to an external non-temperature-compensated crystal oscillator (non-TXCO), generates an oscillating frequency signal to the GPS receiving module. The ADC converts an analog temperature signal into a digital temperature signal. The control unit, coupled to the ADC, adaptively updates temperature/frequency offset data. | 10-22-2009 |
20090262019 | PSEUDORANGE CALCULATION METHOD, POSITION CALCULATION METHOD, COMPUTER-READABLE RECORDING MEDIUM, AND POSITION CALCULATION DEVICE - A pseudorange calculation method for calculating a pseudorange in a position calculation device includes: passing a received signal received from a satellite for position calculation through a first filter; passing the received signal through a second filter having a different phase characteristic from that of the first filter; calculating a first pseudorange on the basis of a signal acquired by passing through the first filter; calculating a second pseudorange on the basis of a signal acquired by passing through the second filter; and calculating a third pseudorange to be used for position calculation, on the basis of the first pseudorange and the second pseudorange. | 10-22-2009 |
20090262020 | POSITIONING DEVICE, ELECTRONIC INSTRUMENT, AND STORAGE MEDIUM STORING PROGRAM - Signals output from two filters included in a filter section | 10-22-2009 |
20090262021 | POSITIONING DEVICE, POSITIONING CONTROL METHOD, POSITIONING CONTROL PROGRAM, AND COMPUTER-READABLE RECORDING MEDIUM HAVING POSITIONING CONTROL PROGRAM RECORDED THEREON - A positioning device comprising: a peak frequency determination section which determines a peak frequency which is a reception frequency corresponding to a maximum correlation value of a specific positioning base code replica and a positioning base code carried on a radio wave from a specific transmission source; a reference frequency calculation section which calculates a low frequency which is a frequency lower than the peak frequency and a high frequency which is a frequency higher than the peak frequency; a reference correlation value calculation section which calculates the correlation value corresponding to the low frequency and the correlation value corresponding to the high frequency; a corrected peak frequency calculation section which calculates a corrected peak frequency based on the correlation value corresponding to the peak frequency, the peak frequency, the correlation value corresponding to the low frequency, the low frequency, the correlation value corresponding to the high frequency, and the high frequency; and a radio wave reception section which receives the radio wave using the corrected peak frequency. | 10-22-2009 |
20090267834 | Event location determination - A method of determining a location of an event of interest by processing signals from a satellite positioning system. The method comprises receiving recorded blocks of data samples of a satellite broadcast including blocks recorded at the approximate location of the event of interest, each block including one or more timestamps generated within a first portable device at which the samples were recorded; receiving a time of occurrence of the event recorded independently of the samples; comparing the timestamps and the time of occurrence to identify at least one block corresponding to the event; and processing the data samples of the identified at least one block to derive position information approximating the location of the event. | 10-29-2009 |
20090273513 | METHOD OF DYNAMICALLY OPTIMIZING THE UPDATE RATE OF GPS OUTPUT DATA - A method of dynamically optimizing the update rate of GPS output data has acts of setting relationships between different moving speeds and different update rates; sensing a current moving speed of a GPS receiver; determining a update rate corresponding to the current moving speed of the GPS receiver; and outputting GPS position and velocity data according to the determined update rate. Since the update rate is variable in view of moving speed, a moving map showing GPS information remains a smooth display. | 11-05-2009 |
20090273514 | ADAPTIVE COHERENT INTEGRATION TIME - A mobile receiver having a coherent integration time that can be adaptively lengthened and shortened. The coherent integration time is based on determining whether information is already known regarding a received satellite signal. Thus, when information, such as, ephemeris, satellite clock, time, almanac, and/or other information, is known, the coherent integration time can be set to a longer time and when information is not known, the information can be set at a shorter time frame. | 11-05-2009 |
20090273515 | METHOD FOR AUTONOMOUS DETERMINATION OF PROTECTION LEVELS FOR GNSS POSITIONING BASED ON NAVIGATION RESIDUALS AND AN ISOTROPIC CONFIDENCE RATIO - Method for the computation of horizontal and vertical protection levels, HPL VPL, that bound up to a given confidence level 1-α the horizontal and vertical components, respectively, of the position estimation error δ of a least squares-based GNSS navigation solution, wherein the HPL and VPL are computed as follows: | 11-05-2009 |
20090278738 | GPS POWER SAVINGS USING LOW POWER SENSORS - A position location system, apparatus, and method are disclosed. A wireless device includes a satellite positioning system (SPS) receiver and position location processor. The SPS receiver detects the availability of positioning signals and the position location processor determines an initial position of the wireless device based upon the positioning signals. A controller generates power saving events when the positioning signals are detected as being available. The controller determines the timing and duration of the power saving events. During a power saving event, the SPS receiver is deactivated and/or processing of the positioning signals is suspended to reduce power consumption of the wireless device. The initial position is updated based upon relative positioning information from one or more sensors during the power saving event. The controller activates the SPS receiver and resumes processing of the positioning signals following the power saving event. | 11-12-2009 |
20090278739 | GPS Signal Data Converter for Providing GPS Signals to a Plurality of Connection Ports - A global positioning system (GPS) signal data converter device includes a plurality of output ports configured to connect with and transmit GPS information to devices connected with the output ports, and a processor configured to receive GPS information in a first format, convert the GPS information from the first format into a second format, and to transmit the GPS information to at least two output ports in the first and second formats. | 11-12-2009 |
20090284414 | POSITIONING METHOD, PROGRAM THEREOF, AND POSITIONING DEVICE - A positioning method includes: executing a first correlation accumulation process on a received signal, a positioning signal spread-modulated with a spread code, and a replica code of the spread code while shifting a phase of the replica code in a first phase search range, setting a second phase search range narrower than the first range based on an accumulated correlation value at a first timing in the first correlation accumulation process, executing a second correlation accumulation process on the received signal and the replica code while shifting the phase of the replica code in the second phase search range, determining appropriateness of the second phase search range based on the accumulated correlation value at the first timing and an accumulated correlation value at a second timing in the first correlation accumulation process, and positioning using a result of the second correlation accumulation process, if the second phase search range is determined appropriate. | 11-19-2009 |
20090289845 | MULTIPLE-MODE LOCATION DETERMINING METHODS AND SYSTEMS - Methods, apparatuses and/or systems are provided for selectively initiating a first mode location determination process using a location determining device if an item is not substantially stationary, and selectively initiating at least a second mode location determination process using the location determining device if the item is substantially stationary. | 11-26-2009 |
20090289846 | Method of processing a digital signal derived from an analog input signal of a GNSS receiver, a GNSS receiver base band circuit for carrying out the method and a GNSS receiver - An acquisition unit of a GNSS receiver base band circuit comprises an integrator ( | 11-26-2009 |
20090289847 | METHOD OF RECEPTION AND RECEIVER FOR A RADIO NAVIGATION SIGNAL MODULATED BY A CBOC SPREAD WAVE FORM - To receive a radio navigation signal modulated by a composite wave form, the composite wave form comprising a linear combination with real coefficients of a component BOC(n | 11-26-2009 |
20090295631 | APPARATUS AND METHOD FOR CROSS-CORRELATION SPUR MITIGATION - An apparatus and method for cross-correlation spur mitigation comprising choosing from a plurality of peak measurements, a first peak measurement with a first carrier-to-noise density estimate and a first Doppler offset measurement, and a second peak measurement with a second carrier-to-noise density estimate and a second Doppler offset measurement to form a pair; calculating a carrier-to-noise density difference based on the first carrier-to-noise density estimate and the second carrier-to-noise density estimate; calculating a Doppler difference based on the first Doppler offset measurement and the second Doppler offset measurement; comparing the carrier-to-noise density difference to a carrier-to-noise density threshold; and comparing the Doppler difference to at least one Doppler threshold. | 12-03-2009 |
20090295632 | Methods and Apparatuses for Processing Satellite Positioning System Signals - Methods and apparatus are provided for use in devices adapted to receive signals from at least one satellite positioning system (SPS). As part of at least one search for a transmission from a space vehicle (SV) associated with the SPS, the methods and apparatuses may correlate a code associated with the SV with a received signal to establish a plurality of correlation values, sample at least a portion of the correlation values during the search, and selectively transitioning the search early or prematurely based, at least in part, on at least one of the sampled correlation values. | 12-03-2009 |
20090303123 | Hybrid GPS Receiving Method and Associated Apparatus - A hybrid Global Positioning System (GPS) receiving method, and associated GPS receiving apparatus is provided. The GPS receiving apparatus includes an RF front-end circuit, a correlation circuit, an acquisition engine and a bidirectional interface control unit. The RF front-end receiving circuit receives a satellite signal and converts the same into a baseband signal. The acquisition engine, coupled to the correlation circuit, determines reception power of the GPS satellite signal. The interface control unit, coupled to the acquisition engine, provides a low-speed interface for transmitting GPS intermediate data that includes a code bin, a frequency bin, navigation data, a local system time and a GPS time. The interface control unit includes a memory interface unit for coupling to a memory. | 12-10-2009 |
20090309791 | SYNC DETECTION DEVICE AND METHOD FOR GNSS - A sync detection device and method for a GNSS receiver. In modernized GNSS, each satellite transmits a data signal and a pilot signal. Correlations are performed between a data symbol stream converted from the data signal with possible hypotheses to find a leading edge of a frame of the data signal (i.e. frame sync detection) and between a pilot symbol stream converted from the pilot signal with possible hypotheses to find a leading edge of a code sequence of the pilot signal (i.e. pilot sync detection). The possible hypotheses for the frame sync detection are selected according to a result of pilot sync detection when pilot sync is done. Frame sync can be efficiently achieved since a range of the selected possible hypotheses is quite limited. | 12-17-2009 |
20090309792 | GPS RECEIVER APPARATUS AND INFORMATION ACQUISITION METHOD THEREOF - The first reception operation is started in response to an acquisition request. Power supply to a RF unit and a demodulator is stopped after synchronization with the GPS signal is established. Based on information acquired from a sub-frame in the GPS signal, a time point to start the second reception operation is determined. Elapsed time is counted using a counter clock synchronized with transmission timing of the navigation message, while a reception frequency of the satellite, a PRN code unique to the satellite, and a frequency and a phase of the PRN code are retained. When the elapsed time arrives at the time point, the power supply to the RF unit and the demodulator is restarted. | 12-17-2009 |
20090315770 | METHOD AND APPARATUS FOR PROCESSING SATELLITE SIGNALS AT A SATELLITE POSITIONING SYSTEM RECEIVER - Method and apparatus for processing satellite signals in an SPS receiver is described. In one example, the satellite signals are correlated against pseudorandom reference codes to produce correlation results. A determination is made whether the SPS receiver is in a motion condition or a stationary condition. The correlation results are coherently integrated in accordance with a coherent integration period. The coherent integration period is a value that depends upon the motion condition of the SPS receiver. | 12-24-2009 |
20090315771 | METHOD AND SYSTEM FOR CLOCK SYNCHRONIZATION IN A GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS) RECEIVER - Aspects of a method and system for clock synchronization in a GNSS receiver are provided. In this regard, generation of a clock signal in a GNSS receiver may be disabled during a first time interval and enabled during a second time interval, wherein a counter utilized to generate the clock signal may be initialized to a known value during the first time interval via a reset signal synchronized to a reference signal. The reference signal may be generated by a temperature compensated crystal oscillator. Additionally, a counter may be incremented on each active edge of the reference signal that occurs during the first time interval and the value stored in the timer may be utilized to correct time in the GNSS receiver after the first time interval. In this regard, the value stored in the timer may be added to the time at which the first interval began. | 12-24-2009 |
20090322602 | INTEGRATED POSITIONING SOLUTION FOR GLOBAL NAVIGATION SATELLITE SYSTEMS - The invention includes a process for one's own global navigation satellite system and at least one other global navigation satellite system including the following: Receiving ranging signals and navigation messages or ranging signals only from the at least one other global navigation satellite system, and processing the received ranging signals and navigation messages in a similar way as the ranging signals and navigation messages of the owned global navigation satellite system. | 12-31-2009 |
20090322603 | Method and system for locating a geographical position using broadcast frequency modulation signals - A method and system for locating and positioning using broadcast frequency modulation (FM) signals, is provided. One implementation involves receiving FM stereo signals from three FM stations at one or more receivers, each stereo signal including a modulated 19 KHz FM pilot tone; and determining a geographical position at each receiver based on the phase difference of the demodulated pilot tones in the received FM signals. | 12-31-2009 |
20090322604 | Method and Apparatus for Mitigating the Effects of Cross Correlation in a GPS Receiver - A positioning system receiver that mitigates cross correlation of received signals from positioning system satellite vehicles by generating the strong satellite vehicle signal and subtracting it from the received signal before correlation while eliminating the need for cross correlation signature without changing the C/A code. | 12-31-2009 |
20090322605 | Methods And Apparatuses For Use With Mode-Switchable Navigation Radio - Methods and apparatuses are provided for use with mode switchable navigation radios and the like. The methods and apparatuses may be implemented to selectively switch between certain operating modes based, at least in part, a mode-switching test that takes into consideration one or more non-timed test conditions to determine if mode-switching may be enabled. | 12-31-2009 |
20090322606 | Method and Apparatus for Real Time Clock (RTC) Brownout Detection - A method and apparatus for real time clock brownout detection. A low power real time clock (RTC) operates continuously to keep time in a global positioning system (GPS) receiver while some receiver components are powered down. In various embodiments, a brownout detector circuit detects a loss of RTC clock cycles. If a loss of RTC clock cycles exceeds a predetermined threshold such that the RTC is not reliable for GPS navigation, an RTC status signal so indicates. | 12-31-2009 |
20100007554 | GNSS broadcast of future navigation data for anti-jamming - A system and a method wherein future navigation data is broadcast on one channel and current navigation data is broadcast on another channel. By instituting minor changes in message structure, anti-jamming capability can be enhanced. In accordance with one method, future navigation data is distributed by satellites to receivers for tracking of a conventional channel. In accordance with another method, part of the future navigation data (i.e., ephemeris and clock data) is distributed by satellites to receivers for use with a dataless channel. | 01-14-2010 |
20100007555 | Compact single-aperture antenna and direction-finding navigation system - An exemplary radio-based navigation system uses a small multimode direction-finding antenna and a direction-finding receiver capable of determining platform position, velocity, attitude, and time while simultaneously providing protection against narrowband and broadband sources of interference. Global Navigation Satellite System (GNSS) signals such as those from the Global Positioning System (GPS) provide attitude measurements with a compact multimode direction-finding antenna (e.g., a small two-arm spiral with improved angle-of-arrival performance over the entire hemisphere enhanced through the use of a conductive vertical extension of the antenna ground plane about the antenna perimeter and/or conductive posts placed evenly around the antenna perimeter) which provides simultaneous protection against jammers. The multimode spiral may be treated as an array of rotationally-symmetric antenna elements. The GPS receiver architecture also may be modified for direction-finding and thereby attitude determination by increasing the requisite number of input signals from one to at least two while minimizing the required number of correlators and mixers. | 01-14-2010 |
20100019970 | Signal processing techniques for improving the sensitivity of GPS receivers - A system for measuring the pseudo range from a first GPS sensor to a designated navigational satellite, for use in a satellite positioning system (SPS) is comprised of first and second GPS sensors for receiving and recording first and second portions of the signal transmitted by the designated navigational satellite, the recordings referred to as the first and second datagrams; and means for transmitting the first and second datagrams to a datagram processing facility wherein the pseudo range from the first GPS sensor to the designated navigational satellite is extracted. The datagram processing facility for extracting the pseudo range is further comprised of a pseudo range engine for extracting a pseudo range from a datagram originating with said first GPS sensor, the location of which is to be determined, the extraction accomplished with the aid of a perfect reference; and a perfect reference engine for generating a perfect reference from a datagram originating with a second GPS sensor designated for the express purpose of perfect reference generation. The perfect reference reduces the minimum number of satellites required to fix a position from four to three, and further enables the pseudo range engine to recombine multi-path GPS signals. | 01-28-2010 |
20100033373 | METHODS AND APPARATUS FOR OBTAINING ACCURATE GNSS TIME IN A GNSS RECEIVER - A method for obtaining GNSS time in a GNSS receiver includes: deriving a relationship between a first clock signal and the received GNSS time; latching a second clock signal and the first clock signal at a first latching point to obtain a clock value A | 02-11-2010 |
20100039321 | METHOD AND SYSTEM FOR CALIBRATING GROUP DELAY ERRORS IN A COMBINED GPS AND GLONASS RECEIVER - Aspects of a method and system for calibrating group delay errors in a combined GPS and GLONASS receiver are provided. The combined GPS and GLONASS receiver may be enabled to receive both GPS signals and GLONASS signals. GPS based navigation information may be calculated based on the received GPS signals. Group delay errors resulted by the received GLONASS signals may be calibrated based on the GPS based navigation information. Respective GLONASS signals may be estimated in responsive to the GPS based navigation information. Corresponding clock information associated with the estimated GLONASS signals may be transferred from the clock information of the GPS based navigation information. A calibration signal may be generated by comparing the estimated GLONASS signals with the received GLONASS signals. The calibration signal may be processed by an error state Kalman filter and may be used to offset the group delay errors in the combined GPS and GLONASS receiver. | 02-18-2010 |
20100039322 | Signal Acquisition Systems With Applications Of General Clocks - A global positioning system (GPS) system includes a clock module for providing multiple counter values at multiple time points. The GPS system also includes a system module coupled to the clock module. The system module is capable of obtaining a time value for each time point according to a set of signals from a signal source. The system module is further capable of calculating a set of parameters based on the counter values and the time value for each time point, and determining an estimated time value based on the parameters and a present counter value from the clock module. | 02-18-2010 |
20100045522 | ANTENNA COMBINATION TECHNIQUE FOR MULTI-FREQUENCY RECEPTION - A set of receiver antennas, of which at least one of the receiver antennas has the capability of receiving frequencies that another receiver antenna from the set is incapable of receiving, is used for determining position and orientation in a navigation system. | 02-25-2010 |
20100045523 | METHODS AND APPARATUS FOR COMPENSATING A CLOCK BIAS IN A GNSS RECEIVER - A method for compensating a clock bias in a Global Navigation Satellite System (GNSS) receiver includes deriving at least one clock drift value comprising a first clock drift value corresponding to a first time point, and calculating the clock bias according to the at least one clock drift value and at least one interval within the time period between the first time point and a specific time point after the first time point. An apparatus for compensating a clock bias in a GNSS receiver is also provided. | 02-25-2010 |
20100045524 | GLOBAL POSITIONING SYSTEM LOG WITH LOW POWER CONSUMPTION - A global positioning system (GPS) log with low power consumption has an antenna, a GPS module, a power control module, a main control module, a power adjusting unit and a memory. The main control module is connected to the GPS module and the power control module to retrieve the computing results of the GPS module and controls the power control module to periodically provide power to the GPS module according to a predetermined and variable power providing period. The power adjusting unit is connected to the main control module, analyzes the computing results of the GPS module and assists the main control module to adjust the power providing period. Since the main control module automatically adjusts the power providing period, the GPS log does not deplete unnecessary power on the GPS module. Therefore, the power consumption of the GPS log is reduced and the GPS operates longer. | 02-25-2010 |
20100045525 | SYSTEM AND METHOD FOR DETECTING A FALLING STATE OF AN ELECTRONIC DEVICE - A system and method for detecting a falling state of an electronic device include setting a time interval to collect position information of the electronic device and one or more alarm means, activating a global position system to locate a position of the electronic device, and acquiring position information of the electronic device at each time interval. The system and method further include calculating an acceleration of the electronic device, and activating one or more of the alarm means if the calculated acceleration is larger or equal to the acceleration of gravity. | 02-25-2010 |
20100052984 | SYSTEMS AND METHODS FOR CONTROLLING A SATELLITE NAVIGATION RECEIVER - A satellite navigation receiver includes a processing unit, a clock generator, and a power management interface. The processing unit is operable for locating the satellite navigation receiver according to multiple satellite signals. The clock generator coupled to the processing unit is operable for providing a reference clock to the processing unit. The power management interface coupled to the processing unit and the clock generator is operable for switching the satellite navigation receiver in multiple operation states. The operation states include a sleep state in which the processing unit is powered off and the clock generator is powered on. | 03-04-2010 |
20100060518 | METHOD AND APPARATUS FOR AUTONOMOUS, IN-RECEIVER PREDICTION OF GNSS EPHEMERIDES - Methods and apparatus for autonomous in-receiver prediction of orbit and clock states of Global Navigation Satellite Systems (GNSS) are described. Only the GNSS broadcast message is used, without need for periodic externally-communicated information. Earth orientation information is extracted from the GNSS broadcast ephemeris. With the accurate estimation of the Earth orientation parameters it is possible to propagate the best-fit GNSS orbits forward in time in an inertial reference frame. Using the estimated Earth orientation parameters, the predicted orbits are then transformed into Earth-Centered-Earth-Fixed (ECEF) coordinates to be used to assist the GNSS receiver in the acquision of the signals. GNSS satellite clock states are also extracted from the broadcast ephemeris and a parametrized model of clock behavior is fit to that data. The estimated modeled clocks are then propagated forward in time to enable, together with the predicted orbits, quicker GNSS signal acquision. | 03-11-2010 |
20100066607 | METHOD AND APPARATUS FOR PROCESSING SATELLITE SIGNALS AT A SATELLITE POSITIONING SYSTEM RECEIVER - Method and apparatus for processing satellite signals in an SPS receiver is described. In one example, the satellite signals are correlated against pseudorandom reference codes to produce correlation results. A determination is made whether the SPS receiver is in a motion condition or a stationary condition. The correlation results are coherently integrated in accordance with a coherent integration period. The coherent integration period is a value that depends upon the motion condition of the SPS receiver. | 03-18-2010 |
20100073230 | CALCULATING NAVIGATION SYSTEM TIME IN A SATELLITE NAVIGATION SYSTEM - A satellite navigation system receiver that includes a counter and a controlling unit is described. The counter may be driven by a reference clock signal having a reference clock frequency. The controlling unit can calculate a correction value indicative of a corrected reference clock frequency by comparing an increment of the counter values during a time period with an increment of the navigation system times during the time period. The controlling unit can generate a calculated navigation system time according to the correction value. | 03-25-2010 |
20100079339 | METHOD AND APPARATUS FOR FAST TRACKING POSITION BY USING GLOBAL POSITIONING SYSTEM - A fast position tracking method and apparatus, the fast position tracking method including the operations of receiving a satellite signal from a plurality of satellites; demodulating satellite data received from a predetermined satellite from among the plurality of satellites by using a pseudo random noise code and a carrier which correspond to the satellite signal; estimating information about satellite data which is at a current time and which is from among the demodulated satellite data according to a real-time clock (RTC) counter; and determining a position. | 04-01-2010 |
20100079340 | METHOD AND DEVICE METHOD FOR DETECTING FREQUENCY JUMPS OF A NAVIGATION SATELLITE'S MASTER CLOCK - A method for detecting frequency jumps of a navigation satellite's master clock, comprising the steps of i) monitoring the master clock signal that is generated by a master clock onboard of the satellite for a frequency jump, and ii) signaling a detected frequency jump of the master clock signal, | 04-01-2010 |
20100085250 | METHOD FOR PROCESSING COMBINED NAVIGATION SIGNALS - The subject matter disclosed herein relates to a system and method for processing multiple navigation signal components received from multiple global navigation satellite systems (GNSS′). In a particular implementation, a code phase in a first navigation signal component may be detected based, at least in part, on information in a second navigation signal component. | 04-08-2010 |
20100085251 | POSITIONING RECEIVER - A positioning receiver in which the circuit configuration of the receiving system corresponding to a plurality of positioning systems can be simplified and the current consumption and circuit size of which can be reduced. A positioning receiver ( | 04-08-2010 |
20100085252 | METHOD FOR PROCESSING RADIONAVIGATION SIGNALS - The satellites of a constellation of satellites each transmit, on distinct frequencies, a first and a second radionavigation signal, respectively. Each station of a reference network from which a satellite is visible performs non-differentiated measurements of code and phase for each of the two signals originating from the satellite and deduces therefrom a raw value of the widelane ambiguity. An internal delay of the satellite and a whole value of the widelane ambiguity are determined, in the network, on the basis of this raw value. The method comprises the steps: -receiving the first and second radionavigation signals at the level of the reference receiver; -performing, with the aid of the reference receiver and for each of the first and second signals received, a non-differentiated measurement of code and a non-differentiated measurement of phase; -calculating the raw value of the widelane ambiguity on the basis of the non-differentiated measurements of code and phase; and -fixing the internal delay of the satellite and the whole value of the widelane ambiguity on the basis of the raw value for the reference receiver. | 04-08-2010 |
20100090894 | Method and System for Processing Positioning Signals Based on Predetermined Message Data Segment - A method and system for determining a geolocation of an object includes collecting a positioning signal including a predetermined message data segment. A time of arrival of the predetermined message data segment may be determined in the positioning signal. Information based on the time of arrival may be provided for determination of a geolocation of an object. The time of arrival of the predetermined message data segment may be determined based on a time search for the predetermined message data segment in the positioning signal. | 04-15-2010 |
20100103038 | POWER SAVING METHOD ADAPTABLE IN GNSS DEVICE - A method and system for navigation are provided to locate a GNSS device. The GNSS device comprises a RF front end receiving satellite signals of a plurality of satellites, and a GNSS device comprising a plurality of correlation channels each performing a correlation process to generate a correlation result from satellite signals corresponding to a satellite, a memory device for storage of the correlation results, and a processor performing acquisition and tracking based on the correlation results. | 04-29-2010 |
20100103039 | METHOD AND APPARATUS FOR COMBINING MEASUREMENTS AND DETERMINING CLOCK OFFSETS BETWEEN DIFFERENT SATELLITE POSITIONING SYSTEMS - Method and apparatus for processing satellite signals from a first satellite navigation system and a second satellite navigation system is described. In one example, at least one first pseudorange between a satellite signal receiver and at least one satellite of the first satellite navigation system is measured. At least one second pseudorange between the satellite signal receiver and at least one satellite of the second satellite navigation system is measured. A difference between a first time reference frame of the first satellite navigation system and a second time reference frame of the second satellite navigation system is obtained. The at least one first pseudorange and the at least one second pseudorange are combined using the difference in time references. | 04-29-2010 |
20100109947 | SYSTEM AND METHOD FOR POSITIONING A GPS DEVICE - A system and a method for determining the correct position for a GPS device from a predefined set of alternatives are provided. Based on the known positions of the visible GPS satellites and of the predefined alternative locations, the system determines theoretical distances between each satellite and each location and/or differences thereof These distances are related to the distance measured between the GPS device antenna and each GPS satellite in order to choose the location from among the predefined location alternatives. Also disclosed are a system and a method for identification of predefined container slots on a freight yard. | 05-06-2010 |
20100117899 | METHOD TO SECURE GNSS BASED LOCATIONS IN A DEVICE HAVING GNSS RECEIVER - A method to detect at a GNSS receiver whether the received GNSS signals and navigation messages are the product of an attack. If there is evidence, as provided by the method described here, that the received signals and messages originate from adversarial devices, then receiver equipped with an instantiation of the method notifies the user or the computing platform that integrates the GNSS receiver that the calculated via the GNSS functionality position and time correction are not trustworthy. In other words, our method enables any GNSS receiver, for example, GPS, GLONAS, or Galileo, or any other GNSS system, to detect if the received navigation messages are the legitimate ones (from the satellites) or not (e.g., from attacker devices that generate fake messages that overwrite the legitimate messages). Based on this detection, neither the user and nor any application running in the computing platform is misled to utilize erroneous position information. | 05-13-2010 |
20100123623 | Method for adjusting a measurement cycle in a satellite positioning system signal receiver - A method for adjusting a measurement cycle in a satellite signal receiver is described. The method includes adjusting a measurement cycle in a satellite signal receiver by computing a position state comprising at least one of a velocity and a heading of the satellite signal receiver, detecting a change in the position state, and automatically adjusting a frequency of said measurement cycle in response to the change in the position state. | 05-20-2010 |
20100134354 | Method and Apparatus for a GPS Receiver Capable or Reception of GPS Signals and Binary Offset Carrier Signals - A system and method capable of mitigating the migration from the current GPS system to the Galileo system and allow a single satellite system positioning receiver to process both GPS signals and Galileo signals. | 06-03-2010 |
20100141519 | METHOD AND SYSTEM FOR A SINGLE RF FRONT-END FOR GPS, GALILEO, AND GLONASS - A wireless receiver receives satellite signals from a plurality of different satellite systems comprising GPS, GLONASS, and GALILEO. A single analog RF front-end is used to process the received satellite signals. The single analog RF front-end uses a single fix-valued analog frequency generated internally for simultaneously receiving the satellite signals comprising signals from a GPS frequency band, a GLONASS frequency band, and/or a GALILEO frequency band. The received satellite signals are separated into single frequency band signals within the GPS frequency band, the GLONASS frequency band, and/or the GALILEO band. Particular satellite channels associated with the single frequency band signals are determined based on corresponding satellite channel frequencies and satellite channel codes. The single analog RF front-end filters the received satellite signals to generate an upper sideband signal comprising signals within the GLONASS bands and a lower sideband signal comprising signals within the GPS bands and/or the GALILEO bands. | 06-10-2010 |
20100141520 | METHOD FOR THE ACQUISITION OF SIGNALS OF A GLOBAL NAVIGATION SATELLITE SYSTEM - A method of acquisition of a received signal received from a global navigation satellite system, includes: obtaining a snapshot of the received signal; correlating the snapshot with a locally-generated signal, wherein the correlating includes: trying a phase delay value indicative of a hypothesized phase delay of the locally-generated signal with respect to the snapshot; and obtaining a partition of the snapshot and the locally-generated signal into corresponding pluralities of blocks, and calculating partial correlation integrals for each block of the plurality of blocks. The corresponding pluralities of blocks each include a first block having a time duration related to the phase delay value. | 06-10-2010 |
20100149033 | METHOD AND SYSTEM FOR POWER MANAGEMENT FOR A FREQUENCY SYNTHESIZER IN A GNSS RECEIVER CHIP - A frequency synthesizer in a GNSS receiver chip enables duty cycling operation of the frequency synthesizer. The frequency synthesizer is cycled on to generate required clock signals for the GNSS receiver chip, and cycled off during a measurement duty cycle comprising measurement available intervals and measurement unavailable intervals. A reference clock inputted to the frequency synthesizer is on during the measurement duty-cycle. During the measurement available intervals, the frequency synthesizer is cycled on to generate the required clock based on the reference clock. During the measurement unavailable intervals, the frequency synthesizer is cycled off and clock timing is maintained based on the reference clock. A number of elapsed clock cycles of the reference clock is captured for a measurement unavailable interval and transferred to a clock offset. The GNSS receiver chip processes signals received using the required clock and the clock offset in a following measurement available interval. | 06-17-2010 |
20100149034 | METHOD FOR CALCULATING CURRENT POSITION COORDINATE AND METHOD FOR CALCULATING PSEUDO RANGE - A method for calculating current position coordinate and a method for calculating a pseudo range are applied to a global positioning system (GPS) receiver. A position coordinate of the GPS receiver at the positioning time point is calculated through an average pseudo range between the GPS receiver and each satellite at a positioning time point. With regard to calculating the average pseudo range between the GPS receiver and each satellite, for each satellite, original pseudo ranges are obtained through calculating a pseudo range between the satellite and the GPS receiver at each millisecond (ms) in a time range including the positioning time point, and then the average pseudo range between the satellite and the GPS receiver at the positioning time point is obtained through calculating an average value of the obtained original pseudo ranges between the GPS receiver and the satellite. | 06-17-2010 |
20100149035 | SATELLITE RADIOLOCALIZATION RECEIVER - The invention uses information gathered from a barometric pressure sensor, connected to a GNSS receiver, to choose an optimal acquisition strategy. In an example, the device of the invention includes a pressure sensor, which is sampled at low rate during power off phases, to store a pressure profile, and a processor programmed to detect the signature of a pressurized-cabin airliner. In this way the GPS receiver can determine if the unit has been flown during an inactivity period, and estimate the duration of the flight. The advantage lies in improving the user experience by shortening the Time to First Fix after air travel. | 06-17-2010 |
20100156716 | METHOD FOR OBTAINING PRECISE TRACKING FREQUENCY OF GPS SIGNAL - A method for obtaining a precise tracking frequency of a global positioning system (GPS) signal is described, which includes the following steps. A plurality of data from a satellite is continuously received. Each data has a tracking frequency. A plurality of phase differences of the received data is calculated. A phase difference average of the obtained phase differences is calculated. A frequency difference is calculated by the calculated phase difference average and a constant frequency parameter. A new tracking frequency is calculated by the frequency difference and a tracking frequency of the last data among the plurality of received data. A next data is received by the calculated new tracking frequency. A new tracking frequency is obtained by repeatedly calculating the average phase differences of the plurality of data received from the satellite and a constant frequency parameter, so as to obtain the most precise tracking frequency. | 06-24-2010 |
20100156717 | METHOD FOR OBTAINING CORRECT PHASE INVERSION POINTS IN SIGNAL OF GPS - A method for obtaining correct phase inversion points in a signal of global positioning system (GPS) includes the following steps. A satellite signal from one of a plurality of satellites is received continuously. A plurality of phase inversion points in the received satellite signal is interpreted. Each time difference between each two adjacent phase inversion points among the plurality of phase inversion points is calculated. It is determined whether each of the time differences is an integral multiple of 20 milliseconds. A data is retrieved every 20 milliseconds from the satellite signal by using a first phase inversion point in the plurality of phase inversion points as a starting point when each of the time differences is an integral multiple of 20 milliseconds. By finding out a plurality of correct phase inversion points in the satellite signal, the positioning speed is increased, and thus a positioning time required is reduced. | 06-24-2010 |
20100156718 | METHOD FOR CALCULATING CURRENT POSITION COORDINATE - A method for calculating current position coordinate is applied to a global positioning system (GPS) receiver. When positioning at a current time point, the GPS receiver directly calculates a code delay and a carrier frequency of each satellite and position coordinate of the GPS receiver at a current positioning time point by utilizing an ephemeris data of each satellite and position coordinate of the GPS receiver at a last positioning time point, thereby greatly lowering an operation amount, so as to reduce the power consumption. | 06-24-2010 |
20100156719 | Power Control Device for a Signal with Optimized Input Dynamics - A signal power control device comprises two amplification channels. A first amplification channel comprises a first transconductance amplifier and a second amplification channel comprises an attenuator mounted in series with a second transconductance amplifier. Gain adjustment means allow the respective gains of the first and the second amplifier to be controlled independently, according to laws, ensuring optimum output dynamics across the entire gain range of the power control device. | 06-24-2010 |
20100164793 | SATELLITE INFORMATION OPERATION METHOD OF GPS DEVICE - A satellite information operation method of a GPS device includes following steps. An antenna module is provided, so as to receive a satellite signal. A signal processing circuit is provided, so as to perform an analog-to-digital conversion on the satellite signal and obtain a plurality of first digital data. A memory with a comparison table stored therein is provided, and the comparison table records corresponding relations between a plurality of second digital data and a plurality of return values. A CPU is provided, which groups the first digital data in sequence by using a bit number of any second digital data in the comparison table, obtains each of the second digital data consistent with each group of first digital data through comparison, and looks up a corresponding return value according to each of the second digital data obtained through comparison to continue the operation according to the obtained return value. | 07-01-2010 |
20100164794 | METHOD FOR OBTAINING PRECISE INTERMEDIATE FREQUENCY OF GLOBAL POSITIONING SYSTEM (GPS) - A method for obtaining a precise intermediate frequency for a global positioning system (GPS) is applied in a GPS receiver having a radio frequency (RF) module. Using a satellite signal received by the RF module, ephemeris data of a satellite is completely obtained, and present coordinate of the GPS receiver is calculated. First coordinate of the satellite at first time point and second coordinate of the satellite at second time point are calculated using the ephemeris data. Then, traveling speed of the satellite and projection value of the traveling speed on position vector from the first coordinate to the present coordinate are calculated using the first time point, the first coordinate, the second time point, and the second coordinate. Finally, the precise intermediate frequency is calculated using the signal frequency, a carrier frequency of the satellite, the projection value, and velocity of light. | 07-01-2010 |
20100164795 | ELECTRONIC DEVICE FOR DECODING NAVIGATION DATA BY USING PHASE ANGLE VARIATION AND METHOD THEREOF - An electronic device for decoding a navigation data by using a phase angle variation and a method thereof are described, which includes the following steps. A phase angle difference between the first phase angle of the first navigation data and the second phase angle of the second navigation data from a satellite signal is calculated. When the phase angle difference is greater than 90 degrees, the first navigation data and the second navigation data are determined to have opposite signs. The second navigation data according to the first navigation data and the result is determined. Therefore, each data is interpreted through directly comparing whether the phase angle difference with the previous data is greater than 90 degrees or not, so that the correct rate in decoding the navigation data is increased. | 07-01-2010 |
20100164796 | METHOD FOR TRACKING SATELLITE SIGNAL BY GPS - A method for tracking a satellite signal by a GPS includes the following steps. Data is continuously received from one of satellites by using tracking frequencies updated one by one based on an average phase difference of received data. Phase inversion points in the plurality of received data are interpreted. A time difference between each two adjacent phase inversion points among the phase inversion points is calculated. It is determined whether each time difference is an integral multiple of 20 ms. When each time difference is an integral multiple of 20 ms, 1-bit data is retrieved for every 20 ms from the satellite signal by taking a first phase inversion point among the plurality of phase inversion points as a starting point. Thus, a positioning speed is increased and a required positioning time is reduced by finding out a precise tracking frequency and a correct phase inversion point. | 07-01-2010 |
20100164797 | METHOD FOR TRACKING SATELLITES WITH MULTIPLE-FREQUENCIES - A method for tracking satellite with multiple-frequencies includes setting a first tracking frequency, tracking a satellite with the first tracking frequency to obtain a first tracking result at a first time point, estimating a second tracking frequency at a second time point according to the first tracking result at the first time point, adjusting the second tracking frequency in a predetermined range to obtain preparatory frequencies, tracking the satellite with the preparatory frequencies to obtain second tracking results, and reviewing strength of received signal of each second tracking result to select the strongest one, and setting the preparatory frequency used to obtain the strongest received signal as a determined tracking frequency to be used to form the communication between a global positioning system (GPS) device and the satellite, repeating the above steps, thereby maintaining the communication with a best tracking frequency between the GPS device and the satellite. | 07-01-2010 |
20100171658 | PROCESSING OF SATELLITE POSITIONING SYSTEM SIGNALS - A method of processing signals from a satellite positioning system, comprises receiving ( | 07-08-2010 |
20100171659 | POSITION ENGINE (PE) FEEDBACK TO IMPROVE GNSS RECEIVER PERFORMANCE - Embodiments of the invention provide a method for making information in the position engine (PE) available to the measurement engine (ME). With the right information the ME can reduce its power consumption, and improve its performance. Other circuits, devices, systems, methods of operation and processes of manufacture are also disclosed. | 07-08-2010 |
20100176990 | Position Determination Based on Hybrid Pseudorange Solution Data - Embodiments provided herein recite methods and systems for position determination based on hybrid pseudorange solution data. In one embodiment, navigation satellite system (NSS) pseudorange data is received for high yield pseudoranges. In addition, NSS pseudorange data is received for high accuracy pseudoranges. The high accuracy pseudoranges and selected ones of the high yield pseudoranges utilized by a hybrid PVT processor to determine a hybrid NSS-based location solution. | 07-15-2010 |
20100176991 | GNSS SUPERBAND ASIC WITH SIMULTANEOUS MULTI-FREQUENCY DOWN CONVERSION - A multi-frequency down converter includes first and second signal paths. A common local oscillator/synthesizer drives both of the signal paths. Exemplary applications include GNSS systems operating across superbands. The down converter is adapted for use in a GNSS receiver system. | 07-15-2010 |
20100194635 | METHOD AND APPARATUS FOR SOFTWARE GPS RECEIVER - A receiver architecture for processing spread spectrum signals. The receiver has an RF front end to receive and down convert a broadcast signal to an intermediate frequency carrier. The IF signal is digitized and provided to a processor (which may be a software-driven DSP, an ASIC or other embodiment) for processing. A given IF carrier is removed and the signal is low pass filtered. The signal is provided to a number of channels, each, for example, correspond to a unique transmitter. On each channel the sample rate is reduced to a predetermined fixed rate with timing mismatch compensated. The Doppler frequency shift, as estimated for the channel, is removed succeedingly. A locally generated copy of the spreading code used by the transmitter is applied to the carrier and Doppler removed signal at the predetermined fixed sample rate. The de-spread signal is used to provide estimates of the Doppler shift and for subsequent sample selection. Pseudo-range and delta pseudo-range estimates from each channel are used to estimate, for example, the receiver's position. | 08-05-2010 |
20100194636 | GPS SIGNAL TRANSMITTER AND SIGNAL TRANSMISSION METHOD THEREOF - A GPS signal transmitter configured with a reduced number of components and achieving low cost, space saving, and low power is provided. A GPS signal transmitter of the present invention includes: a crystal oscillator; a carrier wave generator that outputs a first carrier wave and a second carrier wave whose phase is inverted to the phase of the first carrier wave, using a clock output by the crystal oscillator; a microcomputer that is driven with the clock output by the crystal oscillator and outputs a control signal based on a C/A code which is a pseudo random code; a switch that switches over between the first carrier wave and the second carrier wave according to the control signal from the microcomputer and generates a modulation wave; and an antenna that transmits the modulation wave by radio. | 08-05-2010 |
20100194637 | POSITIONING DEVICE, METHOD OF CONTROLLING POSITIONING DEVICE, AND RECORDING MEDIUM HAVING PROGRAM FOR CONTROLLING POSITIONING DEVICE RECORDED THEREON - A positioning device 20 receives a satellite signal from a satellite positioning system (SPS) satellite and locates a present position, the positioning device 20 including an azimuth calculation section which calculates an azimuth of the SPS satellite corresponding to the received satellite signal, and a reception environment determination section which determines a reception environment including a multipath environment based on the azimuths of the SPS satellites calculated by the azimuth calculation section. | 08-05-2010 |
20100207813 | FREQUENCY VARIATION DETERMINING METHOD, AND SATELLITE POSITIONING SYSTEM UTILIZING THE METHOD - A frequency variation determining method determines a frequency variation of a target signal of a chip. The method comprises: (a) determining an operation state according to a plurality of chip state parameters; and (b) determining the frequency variation of the target signal according to the operation state. | 08-19-2010 |
20100207814 | Global positioning system receiver and satellite clock correcting method thereof - Disclosed is a global positioning system receiver which comprises a satellite signal receiving part constructed and arranged to extract navigation data from a satellite signal received from at least one satellite; a decoder constructed and arranged to decode the navigation data; a satellite location determining part constructed and arranged to determine a location of the at least one satellite according to the decoded navigation data; and a satellite clock correcting part constructed and arranged to calculate a velocity of the at least one satellite and to correct a satellite clock based on at least one of the calculated satellite velocity and the location of the at least one satellite. | 08-19-2010 |
20100214165 | Satellite Signal Reception Device, and Control Method for a Satellite Signal Reception Device - A satellite signal reception device has a reception unit that receives a satellite signal transmitted from a positioning information satellite, and a reception control component that controls the reception unit to execute a reception process. The reception control component includes a satellite signal search component that searches for the satellite signal by means of the reception unit, a reception mode selection component that selects either a time mode or a positioning mode according to the number of satellites from which a satellite signal was captured by the satellite signal search component, a positioning process component that executes a positioning process of receiving the satellite signals and acquiring positioning information by means of the reception unit when the reception mode selection component selects the positioning mode, and a timekeeping process component that executes a timekeeping process of receiving the satellite signals and acquiring time information by means of the reception unit when the reception mode selection component selects the time mode. | 08-26-2010 |
20100220004 | METHOD AND SYSTEM FOR GNSS ASSISTANCE DATA OR LTO DATA DOWNLOAD OVER A BROADCAST BAND - A combined GNSS and FM receiver receives FM signals comprising satellite navigation data from an AGNSS server. Associated navigation information such as a position fix is determined based on the received satellite navigation data. The received satellite navigation data are GNSS assistance data or LTO data. The AGNSS server generates the satellite navigation data by acquiring GNSS data from a satellite reference network. The acquired GNSS data comprise, for example, GPS data, GLONASS data and/or GALILEO data. The generated satellite navigation data are broadcasted as FM signals through RDS and/or RBDS to the combined GNSS and FM receiver. The combined GNSS and FM receiver receives updated satellite navigation data in subsequent FM signals, periodically or aperiodically, and updates associated navigation information, accordingly. The combined GNSS and FM receiver decodes the received FM radio signals for the updated satellite navigation data generated at the AGNSS server before being transmitted. | 09-02-2010 |
20100220005 | METHOD AND SYSTEM FOR A LOCATION-BASED BROKER SERVICE (LBS) CLIENT BROKER - A GNSS enabled handset receives signals from different resources comprising GNSS satellites and/or from a wireless network. The GNSS enabled handset acquires location information comprising various positioning resource data comprising GPS data and/or WiFi data from the received signals. The GNSS enabled handset calculates a plurality of possible position fixes based on the acquired location information using various positioning approaches. A current position fix associated with the GNSS enabled handset is determined based on the plurality of calculated possible position fixes via running a location-based service (“LBS”) client on the GNSS enabled handset. The LBS client determines the plurality of possible position fixes using various positioning approaches in a particular or determined order. Confidence levels for each of the calculated plurality of possible positions are determined and used to refine the current position fix. The refined current position fix is used for a location-based service from a LBS application server. | 09-02-2010 |
20100220006 | GLOBAL POSITIONING SYSTEMS BASED DISCIPLINED REFERENCE CLOCK - A disciplined reference clock generating a frequency accurate clock signal based on a reference pulse generated by a global positioning system is provided. Clock circuitry and processes are also provided to ensure frequency locking and signal validity of the generated clock signal. | 09-02-2010 |