| Entries |
| Document | Title | Date |
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| 20080252518 | METHOD AND APPARATUS FOR DETERMINING LOCATION USING A HYBRID SOLUTION - A method and device for location determination includes receiving at least one signal from a first transmitter and receiving at least one signal from a second signal transmitter. The first transmitter transmits a first type of signal and the second transmitter transmits a second type of signal different from the first type of signal. Location determination further includes assessing a signal quality of the signals received from at least one of the first signal transmitter and second signal transmitter and determining a location of a device using the received first and second type of signals at least from both the first signal transmitter and from the second signal transmitter. | 10-16-2008 |
| 20080284643 | Post-mission high accuracy position and orientation system - A method of generating post-mission position and orientation data comprises generating position and orientation data representing positions and orientations of a mobile platform, based on global navigation satellite system (GNSS) data and inertial navigation system (INS) data acquired during a data acquisition period by the mobile platform, using a network real-time kinematic (RTK) subsystem to generate correction data associated with the data acquisition period, and correcting the position and orientation data based on the correction data. The RTK subsystem may implement a virtual reference station (VRS) technique to generate the correction data. | 11-20-2008 |
| 20080316091 | Accuracy Assessment in Assisted Gps Positioning - Reliable and efficient search windows are provided by allowing the adaptation of the code search window to be dependent on inaccuracy measures of relations between a cellular frame time and a satellite reference time. This inaccuracy is calculated in a positioning node ( | 12-25-2008 |
| 20090091493 | METHOD FOR CORRECTING IONOSPHERE ERROR, AND SYSTEM AND METHOD FOR DETERMINING PRECISION ORBIT USING THE SAME - Provided is a method of correcting an ionosphere error, a system of a precise orbit determination using the same and a method thereof. The method includes the steps of: a) determining a time of a highest elevation angle of a GPS satellite per one pass of each GPS satellite received at a LEO satellite or a receiver on a ground; b) determining a minimum total electron content found from an ionosphere model of the determined time per one pass of each GPS satellite; c) determining a total electron content directly calculated from the LEO satellite or a single frequency GPS data; d) determining an ionosphere error value of a single frequency GPS data by combining the minimum total electron content and the directly calculated total electron content; and e) correcting pseudorange data or carrier phase data based on the determined ionosphere error value. | 04-09-2009 |
| 20090115655 | Managed traverse system and method to acquire accurate survey data in absence of precise GPS data - A method and system obtains precise survey-grade position data of target points in zones where precise GPS data cannot be obtained, due to natural or man-made objects such as foliage and buildings. The system comprises a GPS receiver mounted on a survey pole, with an inertial measurement unit (IMU) and an electronic distance meter (EDM) also mounted on the pole. The system and method obtains GPS data when outside the zone and uses the IMU inside the zone to traverse to a target point, using the EDM to obtain data reduce accumulated errors which occur with the IMU. | 05-07-2009 |
| 20090128403 | SATELLITE-BASED POSITIONING SYSTEM IMPROVEMENT - A method, device and system for determining a receiver location using weak signal satellite transmissions. The invention involves a sequence of exchanges between an aiding source and a receiver that serve to provide aiding information to the receiver so that the receiver's location may be determined in the presence of weak satellite transmissions. With the aiding information, the novel receiver detects, acquires and tracks weak satellite signals and computes position solutions from calculated pseudo ranges despite the inability to extract time synchronization date f, 'n the weak satellite signals. The invention includes as features, methods and apparatus for the calibration of a local oscillator, the cancellation of cross correlations, a Doppler location scheme, an ensemble averaging scheme, the calculation of almanac aiding from a table of orbit coefficients, absolute time determination, and a modified search engine. | 05-21-2009 |
| 20090135054 | System for standard positioning service and precise positioning service cooperative operation - A system for standard positioning service (SPS) and precise positioning service (PPS) cooperative operation is disclosed. In one embodiment, a PPS receiver is utilized to process a PPS data portion of a positioning signal. In addition, an SPS receiver is utilized to process an SPS data portion of the positioning signal. Furthermore, the PPS receiver and the SPS receiver are communicatively coupled such that the PPS data portion from the PPS receiver is cross-validated with the SPS data portion from the SPS receiver thereby corroborating the accuracy of the positioning signal. | 05-28-2009 |
| 20090135055 | METHOD AND APPARATUS FOR IMPROVING INTEGRITY COMMUNICATION IN A SATELLITE NAVIGATION SYSTEM - In a method of improving the integrity communication in a satellite navigation system which comprises a space segment having multiple satellites which emit navigation signals for the reception and evaluation by use systems for position determination, and a ground segment having several observation stations which monitor the satellites, an error budget for different observation stations or groups of observations stations is transmitted with the navigation signal of a satellite. The navigation signal is received and an error budget contained therein is evaluated by computing a scalar value from the error budget. The scalar value indicates the precision of the error estimate for the generation of the navigation signal. | 05-28-2009 |
| 20090140914 | GNSS post positioning with elongated dither sequence - 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 random process generator to generate a sequence of offset vectors to dither the secure position according to a computed dither level to provide the selected precision for a user-available position for the rover receiver. | 06-04-2009 |
| 20090146873 | NAVIGATION SYSTEM WITH APPARATUS FOR DETECTING ACCURACY FAILURES - A navigation system for a vehicle having a receiver operable to receive a plurality of signals from a plurality of transmitters includes a processor and a memory device. The memory device has stored thereon machine-readable instructions that, when executed by the processor, enable the processor to determine a set of error estimates corresponding to pseudo-range measurements derived from the plurality of signals, determine an error covariance matrix for a main navigation solution using ionospheric-delay data, and, using a parity space technique, determine at least one protection level value based on the error covariance matrix. | 06-11-2009 |
| 20090174597 | Global Positioning System Accuracy Enhancement - Methods and systems enhance the accuracy of the global positioning system (GPS) using a low earth orbiting (LEO) satellite constellation. According to embodiments described herein, GPS data is received from GPS satellites at a GPS control segment and is used to create GPS correction data to be utilized by user equipment to correct errors within the GPS data. The GPS correction data is transmitted from the GPS control segment to a LEO ground segment, where it is uplinked to the LEO satellite constellation. To account for bandwidth constraints and minimize any performance degradation of the LEO satellites, the GPS correction data is broadcast to earth on a subset of the total number of available spot beams. The subset of spot beams is selected in part according to satellite angular velocity, bandwidth constraints, and message latency estimates. | 07-09-2009 |
| 20090189804 | SATELLITE DIFFERENTIAL POSITIONING RECEIVER USING MULTIPLE BASE-ROVER ANTENNAS - A rover processor determines position of a rover based upon the interaction between multiple antennas located at the rover and multiple antennas located at a base. The rover antennas may include a rover master antenna having a phase center located at the centroid of the antennas patterns of at least two auxiliary rover antennas. The rover processor may determine the position of the rover master antenna based upon the relative positions of at least two rover antennas (e.g., the rover master antenna and at least one rover auxiliary antenna, or at least two rover auxiliary antennas) with respect to at least two antennas of a base transceiver. | 07-30-2009 |
| 20090195448 | Position Computation in a Positioning System Using Synchronization Time Bias - In general, this disclosure is directed to techniques for computing a positioning solution for a mobile unit based on signals received from the satellite navigation system and the wireless communication system. The techniques allow for, and resolve, a synchronization bias that constrains a system time for the satellite navigation system and a system time for the wireless communication system relative to each other. The mobile unit may utilize the defined constraint to compute a position solution in environments where additional independent measurements would otherwise be required. The mobile unit may incorporate Receiver Autonomous Integrity Monitoring (RAIM) functionality to validate the position and time solutions derived from each of received signals. According to the techniques described herein, the mobile unit may be able to utilize the defined synchronization bias to apply RAIM or similar techniques in environments where such techniques would otherwise be indeterminate. | 08-06-2009 |
| 20090201197 | METHODS OF OPTIMIZING THE LOCATION OF AN AIRCRAFT ON THE GROUND AND IN THE TAKE-OFF AND LANDING PHASES - The present invention relates to the field of methods and systems for optimizing the locating of an aircraft in airports and, more particularly, in the take-off and landing phases, and notably in the air-ground and ground-air transition phases. The method of optimizing the locating of an aircraft during the take-off or landing phase comprising a transition step ( | 08-13-2009 |
| 20090251364 | Method and system of a mobile subscriber estimating position - A method and apparatus of a mobile subscriber (MS) estimating position are disclosed. One method includes the MS receiving at least one satellite transmitted signal with a first receiver, and estimating a time of arrival of the at least one satellite transmitted signal. The MS additionally receives at least one terrestrial base station signal with a second receiver, and estimates a time of arrival of the at least one terrestrial base station signal. The MS estimates its position based on the estimated time of arrival of the at least one satellite transmitted signal and the estimated time of arrival of the at least one terrestrial base station signal. | 10-08-2009 |
| 20090278735 | FREQUENCY AIDING METHOD AND SYSTEM FOR NAVIGATION SATELLITE RECEIVER WITH CRYSTAL OSCILLATOR FREQUENCY HYSTERESIS - A method and apparatus for estimating oscillator signal variation due to temperature and for providing an estimated frequency to a GPS receiver in order to assist the GPS receiver to acquire the signals quickly is disclosed. A temperature sensor is closely thermally coupled with the crystal oscillator in the GPS receiver and during GPS tracking mode, when the error in the oscillator signal is known with precision, outer bounds of TCXO frequency at given temperatures are maintained, which may correspond to rising and falling temperature conditions. During acquisition mode, an estimated frequency value is provided to the GPS receiver based on a determined average of these bounds. Optionally, an uncertainty factor associated with the frequency estimated may also be provided. The two bounds take into account the hysteresis effects of the oscillator signal drift due to temperature so that a more accurate initial frequency estimate can be provided to the GPS receiver, thus reducing its average time to first fix. | 11-12-2009 |
| 20090289841 | POSITIONING APPARATUS - A positioning apparatus includes a correlator | 11-26-2009 |
| 20090289842 | Process for Improving the Continuity in the Case of a Two-Frequency Navigation Satellite System - A process for improving continuity in a two-frequency navigation satellite system includes steps of i) observing the ionosphere by measurements in the two or more frequency bands; and ii) transmitting an alert message which informs user systems of a change of the ionosphere when at least one measurement indicates a change of the ionosphere that deviates from one or more predefined conditions. | 11-26-2009 |
| 20090303114 | METHOD AND SYSTEM FOR DETERMINING LOCATION USING A HYBRID SATELLITE AND WLAN POSITIONING SYSTEM BY SELECTING THE BEST WLAN-PS SOLUTION - This disclosure describes a method and system for determining location using a hybrid satellite and WLAN positioning system by selecting the best WLAN-PS solution. In some embodiments, the method of increasing the accuracy of a WLAN based position estimate using satellite positioning information can include determining a set of possible WLAN location solutions for a WLAN and satellite enabled device based on one or more WLAN access points, obtaining satellite information for the WLAN and satellite enabled device from at least two different satellites, and using the satellite information from the at least two different satellites to determine the best WLAN location solution from the set of possible WLAN location solutions. | 12-10-2009 |
| 20090315763 | Satellite Signal Reception Device, Timekeeping Device with a Satellite Signal Reception Device, and Satellite Signal Reception Method - A satellite signal reception device has a reception unit that receives satellite signals transmitted from a positioning information satellite, a timekeeping unit that keeps time internally, a power supply unit that supplies power at least to the reception unit, a correlation process unit that is disposed in the reception unit and has a plurality of correlators for determining a correlation with the satellite signal when receiving satellite signals, and a correlation process count determination unit that determines how many correlators to use when the reception unit receives the satellite. | 12-24-2009 |
| 20090322597 | LOCATION METHOD AND SYSTEM AND LOCATABLE PORTABLE DEVICE - Location method for locating a portable device ( | 12-31-2009 |
| 20100007550 | Positioning apparatus for a mobile object - A positioning apparatus for a mobile object for measuring a position at a current time includes a GPS positioning unit for updating a GPS operation data; an INS positioning unit with a detection value for INS positioning; a speed detector for detecting speed; an error corrector for correcting an error of the detection value, the position measured by the INS positioning and the speed; and a mobile object model operation unit for calculating a mobile object model; wherein an initial position is calculated using the GPS operation data, and the mobile object model operation unit measures the position to the current time when the current time coincides with a GPS updating time; and wherein the initial position is calculated without the GPS operation data, and the mobile object model operation unit measures the position to the current time when the current time does not coincide with a GPS updating time. | 01-14-2010 |
| 20100013702 | Methods and Apparatuses For Requesting/Providing Sensitivity Assistance Information Associated with Various Satellite Positioning Systems in Wireless Communication Networks - Methods and apparatuses are provided for use by devices within a wireless communication network to request and/or provide sensitivity assistance information signals associated with one or more Satellite Positioning Systems (SPSs). | 01-21-2010 |
| 20100019960 | Method and Apparatus for Mitigating Multipath Effects at a Satellite Signal Receiver Using a Sequential Estimation Filter - A method and apparatus for mitigating multipath effects in a satellite signal receiver is described. In one example, measured pseudoranges are obtained from the satellite signal receiver to a plurality of satellites. For each measured pseudorange: an expected pseudorange is derived from a sequential estimation filter in the satellite signal receiver. The measured pseudorange and the expected pseudorange are differenced to compute a pseudorange residual. The measured pseudorange is applied to the sequential estimation filter only if the pseudorange residual is within a window. | 01-28-2010 |
| 20100026566 | MOBILE-UNIT POSITIONING DEVICE - In a mobile-unit positioning device, phases of pseudo noise codes carried on satellite signals from satellites are observed at a mobile unit to measure a position of the mobile unit. A pseudo distance between one of the satellites and the mobile unit is measured for every satellite during a stop of the mobile unit using an observed value of the phase acquired during a stop of the mobile unit. An error index value indicating an error of the measured distance is computed based on the distances measured at points in time during a stop of the mobile unit. A weighting factor is determined based on the index value computed for every satellite. A weighted positioning computation using the determined weighting factor is performed to determine a position of the mobile unit during movement using an observed value of the phase acquired during movement. | 02-04-2010 |
| 20100052979 | METHOD AND APPARATUS FOR THE OPTIMIZATION OF STATUS MESSAGES IN A SATELLITE NAVIGATION SYSTEM - In a method for optimization of status messages in a satellite navigation system, which comprises a space segment having a plurality of satellites that emit navigation signals to be received and evaluated by utilization systems for position determination, and a ground segment having a plurality of observation stations that monitor the satellites, a threshold value is determined, as a function of location, for a message indicating that the error of a satellite is no longer acceptable. | 03-04-2010 |
| 20100060516 | METHOD OF DETERMINING APPROPRIATENESS OF SATELLITE ORBIT MODELING, METHOD OF PROVIDING LONG-TERM PREDICTED ORBIT DATA, AND DEVICE FOR DETERMINING APPROPRIATENESS OF SATELLITE ORBIT MODELING - A method of determining the appropriateness of satellite orbit modeling is provided. The method includes calculating values of parameters, that the predetermined model has, on the basis of predicted position data including a first predicted position at a first point of time and a second predicted position at a second point of time of a positioning satellite in time series, calculating a first and a second calculated positions of the positioning satellite derived from the predetermined model by using the values of the parameters; and determining the appropriateness of the predetermined model using the values of the parameters, on the basis of first difference between the first predicted position and the first calculated position, and seconded difference between the second predicted position and the second calculated position. The predetermined model is used when approximating a satellite orbit of the poisoning satellite. | 03-11-2010 |
| 20100066600 | MOBILE APPARATUS FOR TRACKING SATELLITE AND METHOD THEREOF - A mobile apparatus for tracking a satellite, includes: a mobile unit; a GPS receiving unit mounted on the mobile unit that generates position coordinates of the mobile unit; a level meter mounted on the mobile unit that adjusts the mobile unit in horizontal and obtains a tilt angle of the mobile unit; an antenna unit mounted on the mobile unit and being adjusted to the true north direction according to the position coordinates. Further, the mobile apparatus for tracking a satellite includes position tracking control unit mounted on the mobile unit that temporarily stops the mobile unit when tracking a position of the satellite, adjusts the mobile unit in horizontal by the level meter and aligns the position coordinates and the tile angles to correct current position information of the mobile unit. | 03-18-2010 |
| 20100066601 | METHOD AND SYSTEM FOR DETERMINING TIME IN A SATELLITE POSITIONING SYSTEM - Method and apparatus for receiving an estimate of time in a satellite signal receiver receives an estimate of time from a server and compensates for error of a clock in the satellite signal receiver using the estimate of time. The output of the compensated clock is used when computing a position of the satellite signal receiver. The estimate of time is received using a network time protocol (NTP), a simple network time protocol (SNTP), or by one-way broadcast from the server. | 03-18-2010 |
| 20100066602 | METHOD AND APPARATUS FOR SHARING INFORMATION BETWEEN GPS ENGINES IN MOBILE TERMINAL - A mobile terminal and method for sharing Global Positioning System (GPS) information is provided. The mobile terminal includes a first GPS engine and a GPS driver. The first GPS engine updates GPS information. The GPS driver stores the GPS information updated by the first GPS engine, and when the first GPS engine changes to a second GPS engine, provides the stored GPS information to the second GPS engine. Since GPS information is shared between GPS engines in the mobile terminal which uses the plurality of GPS engines, in the case where one of the GPS engines is selectively used for a GPS operation, warm start or hot start may be performed as much as possible. | 03-18-2010 |
| 20100066603 | System and Methods for Real Time Kinematic Surveying Using GNSS and Ultra Wideband Ranging - Disclosed are systems and methods for augmenting the GNSS RTK surveying system with ground-based ranging transceivers, such as ultra wideband (UWB) Radio Frequency (RF) transceivers. A system embodiment includes a plurality UWB reference ranging transceivers, a movable UWB ranging transceiver, and at least one GNSS RTK receiver. A method includes identifying the surveyed area and placing one or more reference ranging transceivers in the locations proximate to the identified surveyed area. A position of such reference ranging transceivers may be determined using a GNSS receiver. A movable ranging transceiver may be provided in the surveyed area which is configured conduct ranging measurements. GNSS satellite measurements and UWB ranging measurements may be combined to estimate the position of the surveying ranging transceiver. An estimate for the bias and scale factor states for UWB range pairs may be undertaken in order to provide improved position estimation. | 03-18-2010 |
| 20100079333 | METHOD AND SYSTEM FOR LOCATION-DEPENDENT TIME-SPECIFIC CORRECTION DATA - A method and system for delivery of location-dependent time-specific corrections. In one embodiment, a first extended-lifetime correction for a first region is generated. A distribution timetable is used to determine a first time interval for transmitting the first extended-lifetime correction to the first region. The first extended-lifetime correction is then transmitted via a wireless communication network to said first region in accordance with said distribution timetable. | 04-01-2010 |
| 20100079334 | LOW-COMPLEXITY TIGHTLY-COUPLED INTEGRATION FILTER FOR SENSOR-ASSISTED GNSS RECEIVER - Embodiments of the invention provide a blending filter based on extended Kalman filter (EKF), which optimally integrates the IMU navigation data with all other satellite measurements tightly-coupled integration filter. This blending filter can be easily implemented with minor modification to the position engine of stand-alone GNSS receiver. Provided is a low-complexity tightly-coupled integration filter for sensor-assisted global navigation satellite system (GNSS) receiver. The inertial measurement unit (IMU) contains inertial sensors such as accelerometer, magnetometer, and/or gyroscopes Embodiments also include method for pedestrian dead reckoning (PDR) data conversion for ease of GNSS/PDR integration. The PDR position data is converted to user velocity measured at the time instances where GNSS position/velocity estimates are available. | 04-01-2010 |
| 20100090888 | SBAS CORRECTION INFORMATION IN MS BASED AGPS SYSTEM - A method for providing a mobile station, being connected to a wireless communication system, with GPS assistance data, comprises obtaining ( | 04-15-2010 |
| 20100097267 | Determining a Geolocation Solution of an Emitter on Earth Using Satellite Signals - Embodiments provide systems and methods for determining the geolocation of an emitter on earth. A solution is obtained from two TDOA measurements that need not be acquired at the same time. A solution is obtained from a TDOA measurement and an FDOA measurement that need not be acquired at the same time and need not be coming from the same satellite pair. A location of an emitter can be determined from minimizing a cost function of the weighted combination of the six solutions derived from the two TDOA measurements and the two FDOA measurements, where the weight of each solution in the combination is determined based on the intersection angle of the two curves that define the possible locations of the emitter based on the TDOA and/or FDOA measurements. | 04-22-2010 |
| 20100103031 | METHOD OF DETERMINING RELIABILITY OF LONG-TERM PREDICTED ORBIT DATA, METHOD OF PROVIDING LONG-TERM PREDICTED ORBIT DATA, AND INFORMATION PROVIDING APPARATUS - A method of determining the reliability of long-term predicted orbit data is disclosed. The method includes: analyzing a variation in the accuracy of the time-series predicted positions included in predicted position data by comparing the predicted positions included in the predicted position data, which is acquired by predicting a position of a positioning satellite in a time series, with actual positions of the positioning satellite corresponding to the predicted positions; and determining the reliability in each of the prediction periods of the long-term predicted orbit data including predicted satellite orbits in a plurality of successive prediction periods on the basis of the analysis result. | 04-29-2010 |
| 20100117894 | Gps-based measurement of roll rate and roll angle of spinning platforms - A system and method for determining the roll rate and roll angle of a spinning platform, using the measured phase differences between the GPS satellite signals received on two or more antennas. The measured phase differences and the navigation solution from a GPS receiver are processed in a Kalman filter to obtain the desired information. Data from non-GPS measurement sources is optionally provided to update the navigation solution. Although of wide applicability, the invention is uniquely suited to the measurement of roll rates and roll angles of fast spinning platforms with small baselines, in which the antennas are separated from each other by distances that are a fraction of the GPS signal wavelength. | 05-13-2010 |
| 20100117895 | POSITION CALCULATING METHOD AND POSITION CALCULATING DEVICE - A position calculating method includes: calculating a position of a mobile body based on a positioning signal from a positioning satellite; determining the moving condition of the mobile body based on a detection result of a sensor unit including at least one of an acceleration sensor, an angular speed sensor, and an azimuth sensor; changing an error parameter used for a predetermined Kalman filter process according to the determined moving condition; and correcting the calculated position by the Kalman filter process. | 05-13-2010 |
| 20100134348 | POSITIONING DEVICE, METHOD OF CONTROLLING POSITIONING DEVICE, AND RECORDING MEDIUM - A positioning device, which locates a position based on satellite signals which are signals from positioning satellites, includes a position holding section which holds a reference position P, a stationary condition determination section which determines whether or not the reference position P satisfies stationary conditions B, an average position calculation section which averages the reference position P satisfying the stationary conditions B and a present located position Pg calculated by positioning to calculate an average position Pav, a position output section which outputs the average position Pav, and a position storage section which stores the average position Pav in the position holding section as the reference position P. | 06-03-2010 |
| 20100149025 | 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. | 06-17-2010 |
| 20100156707 | Method and Apparatus for Determining the Geographic Location of a Device - A method and apparatus for determining the location of a device from signals provided by a plurality of satellites. A device receives a first plurality of signals comprising one signal from each of a first plurality of satellites and determines a first location of the device as a function of the first plurality of signals. The device then determines a second location thereof as a function of a second plurality of signals if the first location is not within a predetermined threshold. The second plurality of signals is a first subset of the first plurality of signals. | 06-24-2010 |
| 20100176987 | Method and apparatus to estimate vehicle position and recognized landmark positions using GPS and camera - A navigation system with a capability of estimating positions of the platform vehicle and recognized landmarks using satellite information and camera measurements is disclosed. One aspect is to represent a landmark by one or few representative features by executing image recognition and feature extraction to find representative features inside the recognized landmark. Another aspect is to re-identify the recognized landmarks in the landmark database correlating the landmark attributes obtained by image recognition and mathematical feature characteristics obtained by feature extraction with the corresponding data in the landmark database. A further aspect is to enhance navigation accuracy through the Kalman filter architecture with additional imagery measurements of landmarks whose positions are known or previously estimated. According to the aspects noted above: (1) navigation accuracy improves with augmented imagery measurements; (2) a database of recognizable landmark attributes and associated feature characteristics can be created in real-time; (3) by re-visiting the same landmarks, navigation accuracy improves and the landmark database will be re-calibrated and augmented with new landmark data. | 07-15-2010 |
| 20100182194 | Positioning Apparatus and Method - A positioning apparatus and the associated positioning method are provided. The positioning apparatus includes a wireless communication unit, a storage unit, a positioning module and a control unit. The wireless communication unit generates a detection signal. The storage unit coupled to the wireless communication module stores assistance positioning data. The positioning module coupled to the storage unit generates coordinate information according to a satellite signal and the assistance positioning data. The control unit coupled to the wireless communication module, the storage unit and the positioning module determines whether the assistance positioning data is valid. When the assistance positioning data is invalid, the control unit controls the wireless communication module to generate the detection signal. | 07-22-2010 |
| 20100188284 | POSITION CALCULATING METHOD AND POSITION CALCULATING DEVICE - A position calculating method includes: executing position calculation processing using a plurality of Kalman filter processing, which is processing corresponding to each of a plurality of power spectral density groups classified by performing in advance frequency analysis on the movement acceleration of a movable body as an object of position calculation and which includes an error parameter set to a different value according to the power spectral density group and a parameter indicating that the movable body is in a uniform motion state, on the basis of a satellite signal from a positioning satellite; and determining the position of the movable body using a position calculated by each Kalman filter processing. | 07-29-2010 |
| 20100207810 | POSITION CALCULATING METHOD AND POSITION CALCULATING DEVICE - Position calculating methods and devices are described. Satellite information may be calculated, which includes satellite position, satellite movement speed, and satellite movement direction of a positioning satellite. A pseudo distance between the positioning satellite and a user may be calculated based on a satellite signal received from the positioning satellite. The position of the user may be calculated using the satellite information and the pseudo distance in executing a convergence calculation with positioning information for a reference satellite, thereby eliminating a time error term from unknown quantities. | 08-19-2010 |
