Class / Patent application number | Description | Number of patent applications / Date published |
342357260 | Using carrier phase measurements; e.g., kinematic positioning; using long or short baseline interferometry (IPC) | 67 |
20110012783 | Navigation Receiver for Processing Signals from a Set of Antenna Units - A navigation receiver processes signals transmitted by global navigation satellites and received by a set of antenna units. Each antenna unit is connected to a separate input port of an antenna multiplexer switch. Satellite signals received from each antenna unit are consecutively switched to the input of a common radiofrequency processing module. A common signal correlator generates a common in-phase correlation signal from the satellite signals received from all the antenna units. The common in-phase correlation signal is processed by a data processing module to demodulate information symbols from the received satellite signals. The common in-phase correlation signal is also processed by phase-lock loops and delay-lock loops to generate carrier phases and code delays from the received satellite signals. Embodiments are described in which, along with the common in-phase correlation signal, common functional blocks or hardware are used to process the satellite signals received from all the antenna units. | 01-20-2011 |
20110037646 | INTER-MOBILE BODY CARRIER PHASE POSITIONING DEVICE AND METHOD - The inter-mobile body carrier phase positioning device according to the invention includes: a first observation data acquisition means that acquires observation data concerning a phase accumulation value observed in a first mobile body; a second observation data acquisition means that acquires observation data concerning a phase accumulation value observed in a second mobile body; a satellite pair determination means that determines pairs of satellites used for carrier phase positioning; and a carrier phase positioning means that takes, between each of the pairs of the satellites determined by the satellite pair determination means, a single or double difference between the observation data acquired by the first observation data acquisition means and the observation data ac quired by the second observation data acquisition means, and determines relative positional relation between the first mobile body and the second mobile body by carrier phase positioning using the single or double difference of the observation data. | 02-17-2011 |
20110037647 | RELATIVE POSITION DETECTING APPARATUS, AND RELATIVE POSITION DETECTING SYSTEM - In a case in which three or more movable objects, each of those detecting the relative position with respect to another movable object, are able to communicate with each other: a reference movable object obtains observation data and transmits the observation data to non-reference movable objects; one non-reference movable object calculates the relative position with respect to the reference movable object by performing interferometric positioning using the observation data obtained by the observation data obtaining means and data including observation data received from the reference movable object, and also transmits data including an integer bias calculated as interferometric positioning results to another non-reference movable object and receives reliability determination results regarding the interferometric positioning; and the another non-reference movable object receives data including the integer bias from the one non-reference movable object and determines the reliability of the interferometric positioning. | 02-17-2011 |
20110148697 | HYBRID SATELLITE POSITIONING RECEIVER - A satellite positioning receiver. The receiver comprises: an RF front end, for receiving satellite positioning signals; an analogue to digital converter, for sampling the received signals to generate signal samples; a memory; and a processor, for processing the signal samples to derive code-phases and pseudo-ranges and to calculate a position fix. The processor has a first mode in which it is operable to process the samples as they are generated, to calculate the position fix. It also has a second mode in which it is operable to store the samples or the code-phases or pseudo-ranges in the memory for later processing. | 06-23-2011 |
20110181462 | System and Method for Positioning with GNSS Using Multiple Integer Candidates - Methods and systems find position solutions using GNSS carrier phase. A plurality of integer cycle ambiguity candidates associated with the carrier phase are found as a function of corrected carrier phases. Positions and position error estimates are derived from the plurality of integer cycle ambiguity candidates. | 07-28-2011 |
20110181463 | SATELLITE-BASED POSITIONING RECEIVER - A satellite-based positioning receiver includes processing channels, each processing channel being associated with a respective satellite from among N satellites, and an extended Kalman filter for performing a vector tracking for the set of satellites using signals received from the satellites. The extended Kalman filter performs a resetting on the basis of the phase error and code error received directly from the phase and code discriminators, of each channel, and the receiver includes first means for calculating the code-wise and carrier-wise control signals for the said code phase and carrier phase numerically-controlled oscillators, on the basis of data provided by the said extended Kalman filter, for each channel. | 07-28-2011 |
20110273328 | PRECISION GEOLOCATION OF MOVING OR FIXED TRANSMITTERS USING MULTIPLE OBSERVERS - A method of geolocating a stationary transmitter observed by a fixed receiver device and at least two receiver devices, at least one of the receiver devices moving includes obtaining wavelength-scaled phase difference measurements between pairs of receiver devices, and obtaining a result lattice of possible locations of the transmitter, one location more probable than the remainder. A method of geolocating a moving transmitter observed by a plurality of fixed or nearly fixed receiver devices, and a moving receiver device, includes obtaining wavelength-scaled phase difference measurements from the plurality of fixed or nearly fixed receiver devices to obtain a shape of the transmitter trajectory, measuring the phase difference between the moving receiver device and at least one of the plurality of fixed or nearly fixed receiver devices to obtain a phase error residual, and moving an estimated starting point of the transmitter to obtain a best-fit residual. | 11-10-2011 |
20110298658 | Position Determination Using Measurements From Past And Present Epochs - The subject matter disclosed herein relates to positioning systems and location determination using measurement stitching. | 12-08-2011 |
20120194381 | SYSTEM TO SECURELY CONTROL USE OF ELECTRONIC DEVICES IN AEROPLANES - This invention is provided to securely control use of electronic devices in aeroplanes. In one embodiment, a system including a secured electronic device provided by an aeroplane for use in a passenger compartment in the aeroplane, whereas use of the device includes downloading information such as net surfing web pages and uploading information such as sending external emails. In the embodiment, the system includes a mobile equipment of a first customer and a mobile equipment of a second customer. The system also includes an outdoor GPS and indoor GPS receivers. Further, a set of three indoor GPS signal emitters are located on separate corners of the passenger compartment are provided. Besides, a GPS antenna, a repeater, and a secured control unit are installed inside the electronic device to include a preconfigured area as an insecure area. | 08-02-2012 |
20120293366 | SYSTEM, METHOD AND COMPUTER PROGRAM FOR ULTRA FAST TIME TO FIRST FIX FOR A GNSS RECEIVER - The present invention provides a system, method and computer program for a GNSS receiver that is operable to provide an ultra fast Time To First Fix (TTFF). The invention is implementable without requiring the decoding of a navigation message transmitted by GNSS satellite systems. The system of the present invention may comprise a parameter obtaining means, a clock obtaining means and a Fast TTFF engine. The parameter obtaining means may obtain satellite parameters of one or more GNSS satellites. The clock obtaining means may obtain a clock for estimating a GNSS time tag. The Fast TTFF engine may be linkable to a signal interface that is operable to provide I/Q samples from a GNSS antenna. The Fast TTFF engine may comprise a measurement generation utility, a coarse search utility and a fine search utility. The measurement generation utility may compute the Doppler frequency shift and the code phase of the one or more GNSS satellites based on the I/Q samples. | 11-22-2012 |
20130009812 | POSITION MEASUREMENT SYSTEM FOR GEOSTATIONARY ARTIFICIAL SATELLITE - Ground stations | 01-10-2013 |
20130016007 | GNSS RECEIVER AND POSITIONING METHODAANM Yamamoto; TakuyaAACI Nisshin-shiAACO JPAAGP Yamamoto; Takuya Nisshin-shi JPAANM Kadowaki; YoshinoriAACI Toyota-shiAACO JPAAGP Kadowaki; Yoshinori Toyota-shi JPAANM Yanai; AkihiroAACI Toyota-shiAACO JPAAGP Yanai; Akihiro Toyota-shi JPAANM Satoh; YohAACI Miyoshi-shiAACO JPAAGP Satoh; Yoh Miyoshi-shi JP - A GNSS receiver includes: a first correlation peak detecting unit ( | 01-17-2013 |
20130314277 | System and Method for Determining GPS Receiver Position - Systems and methods for determining a position of a global positioning system (GPS) receiver are provided. A first satellite and a second satellite that have an unobstructed communication path to the GPS receiver are identified. For each of the first and second satellites, data received is used to determine a satellite position and a code phase for a transmitted satellite signal. A relative code phase is calculated between the transmitted satellite signals of the first satellite and the second satellite, where the relative code phase is a difference between the determined code phases. The position of the GPS receiver is determined based on the satellite positions of the first and second satellite and the relative code phase. | 11-28-2013 |
20140015711 | WIRELESS COMMUNICATION SYSTEM AND TIME SYNCHRONIZATION METHOD OF THE SAME - A wireless communication system having a time synchronization mechanism is provided. The wireless communication system comprises a first receiver and a second receiver. The first receiver tracks a code phase data of a satellite to generate a synchronization data related to a sync phase position and a first receiver phase position corresponding to one of first receiver time pulses. The second receiver comprises a receiving unit, a tracking unit and a computing unit. The receiving unit receives the synchronization data from the first receiver through a network. The tracking unit tracks the code phase data of the satellite to obtain a second receiver phase position corresponding to one of second receiver time pulses. The computing unit performs a time synchronization process with the first receiver and the satellite according to the code phase data, the synchronization data and the second receiver phase position. | 01-16-2014 |
20140062771 | DETECTION AND CORRECTION OF CARRIER PHASE INCONSISTENCY DURING THE TRACKING OF A RADIO NAVIGATION SIGNAL - The invention relates to a method for tracking the carrier phase of a signal received from a satellite by a carrier using a carrier loop of the carrier phase, said signal being acquired by a navigation system of the carrier, said navigation system including a receiver for location by radio navigation, and a self-contained unit, wherein the receiver is suitable for acquiring and tracking the phase of the carrier of the signal from the satellite. | 03-06-2014 |
20150301190 | GNSS Signal Processing Methods and Apparatus - Methods and apparatus are presented for determining a position of a GNSS rover antenna from observations collected at the antenna over multiple epochs from satellite signals of multiple GNSS, wherein the observation data of each GNSS has a distinct data format. The observation data of each GNSS are presented in a generic GNSS data format, which differs from the distinct data format of the GNSS, to obtain a set of generic data. A set of difference data is prepared representing differences between the converted observation data and the generic data. When at least four satellites are tracked, the generic data of the tracked satellites of multiple GNSS are used to compute a standalone antenna position. When at least five satellites are tracked, the generic data of the tracked satellites of multiple GNSS are used to compute a real-time kinematic antenna position. | 10-22-2015 |
20150355340 | CO-LOCATED ANTENNA - A co-located global navigation satellite system (GNSS) antenna ( | 12-10-2015 |
20160003948 | ELECTRONIC TAPE MEASURE ON A CELLPHONE - A radio frequency component receives and digitizes a first plurality of L1 Global Navigation Satellite System (GNSS) signals and a second plurality of L2C GNSS signals from a plurality of GNSS satellites. A software defined GNSS receiver operating on a processor of a cellular telephone separate from the radio frequency component derives carrier phase measurements from the first plurality of L1 GNSS signals and the second plurality of L2C GNSS signals during an epoch. A wireless message from a communication device located at a base location is received conveying pseudorange and carrier measurements derived from the first plurality of L1 GNSS signals from said plurality of GNSS satellites during the epoch. The cellular telephone determines a distance from the base location to said first location. | 01-07-2016 |
20160011318 | Performance and Cost Global Navigation Satellite System Architecture | 01-14-2016 |
20160109581 | System and Method for Position Determination Using Low Earth Orbit Satellites - A system and method for position determination using low earth orbit satellites. A mobile terminal affixed to an asset initiates a collection of global positioning system satellite measurements (e.g., code phase) based on a hardware trigger generated by a low earth orbit satellite modem. Timing information reflective of the time of the hardware trigger pulse is transmitted to an operations center along with the global positioning system satellite measurements to enable the operations center to determine a position of the mobile terminal. | 04-21-2016 |
20160124093 | PREPARATION SYSTEM FOR SURVEYING OPERATION - A preparation system for surveying operation of the present invention includes a mobile station disposed at a known observation point and a fixed station disposed at an unknown reference point. The preparation system includes an arithmetic step to determine the position coordinate of the unknown reference point based on positioning data received by the mobile station, positioning data received by the fixed station, and a position coordinate of the known observation point, and an assigning step to assign the unknown reference point whose position coordinate is determined as the known reference point. | 05-05-2016 |
20160377727 | DEVICE FOR TRACKING A SATELLITE RADIONAVIGATION SIGNAL IN A MULTIPATH ENVIRONMENT - A GNSS receiver comprising a circuit configured to receive a positioning signal comprising a carrier modulated by a subcarrier and a PRN code; a subcarrier and code tracking loop, comprising a first discrimination circuit, configured to calculate a first pseudo range from said received positioning signal and a first reference signal; a code tracking loop, comprising a second discrimination circuit, configured to calculate a second pseudo range from said received positioning signal and a second reference signal; and a calculation circuit configured to evaluate a difference between said first pseudo range and said second pseudo range, and to modify the output of the first discrimination circuit accordingly. | 12-29-2016 |
20180024247 | LOW-ENERGY CONSUMPTION LOCATION OF MOVABLE OBJECTS | 01-25-2018 |
342357270 | Carrier phase ambiguity resolution; floating ambiguity; LAMBDA [Least-squares AMBiguity Declaration Adjustment] method (IPC) | 44 |
20100220007 | LEO-BASED POSITIONING SYSTEM FOR INDOOR AND STAND-ALONE NAVIGATION - A method for estimating a precise position of a user device from signals from a low earth orbit (LEO) satellite includes receiving at least one carrier signal at a user device, each carrier signal being transmitted a distinct LEO satellite. The user device processes the carrier signals to obtain a first carrier phase information. The user device recalls an inertial position fix derived at an inertial reference unit. The user device derives a position of the user device based on the inertial position fix and the first carrier phase information. | 09-02-2010 |
20100253575 | GENERALIZED PARTIAL FIXING - Described is a generalized approach for integer parameter estimation, especially in the context of Global Navigation Satellite Systems (GNSS). The problem solved is the case where a definitively correct integer solution cannot be identified for all ambiguity parameters in a reliable way. The proposed solution is to apply a linear transformation to the ambiguities (multiply with a matrix) such that the images of the first and the second candidate (or more) are identical. That way, from the first and second (and possibly more) candidates of the integer least-squares solution, a subset of ambiguity combinations is derived that can be fixed. Thus, it is no longer necessary to choose between the solutions as they coincide for the new ambiguities. The advantage of this approach is maximizing all information still available when finally deriving additional parameters such as position, clock error, atmospheric errors and/or time correlated noise. This technique is applicable to real-time and post-processing applications, as well as to pure GNSS applications, GNSS integrated with other sensors (e.g. INS) and other applications that have to resolve multiple integer ambiguities. This may also apply to optical distance-measurement. GNSS applications include kinematic and static positioning with single base stations as well as with multiple base stations or reference station networks. They also comprise the integer parameter estimation methods used within the reference station network computations. | 10-07-2010 |
20100309043 | METHOD FOR DETERMINING THE DISTANCE BETWEEN A TRANSMITTER AND A RECEIVER - The present invention relates to a multiple carrier smoothing method for navigation satellite signals, in particular a three carrier smoothing method for Galileo signals. It provides a smoothed code solution, which is ionosphere-free to the first order and whose noise is reduced to sub-decimeter level. The method involves integer ambiguities, which can be resolved reliably. The sensitivity of the new method to receiver biases and ionospheric delays of the second order is small. The performance of the three carrier smoothing method allows to reduce the averaging interval to ⅕-th of its current standard value. The results refer to pseudo ranges and are geometry independent. | 12-09-2010 |
20110050492 | Single Frequency User Ionosphere System and Technique - A method and apparatus for directly estimating depleted ionosphere delay in a GPS receiver and using the estimate for improved navigation precision in satellite based augmentation systems. | 03-03-2011 |
20110102254 | CENTIMETER POSITIONING USING LOW COST SINGLE FREQUENCY GNSS RECEIVERS - A global positioning system includes a base GNSS receiver that determines position and carrier phase measurements for GNSS satellites in view and a rover GNSS receiver, which is a single frequency receiver that captures GNSS satellite signals transmitted in the single frequency band during a capture window from a plurality of GNSS satellites, the plurality being large enough to provide a carrier phase data set from which a solution to associated integer carrier phase ambiguities is over determined. The system determining from the captured signals, a search space associated with the satellites in view, the code phase delays and associated position uncertainty. The system resolving the integer carrier cycle ambiguities using double difference carrier phase measurements associated with signal power values that are over a predetermined threshold value. The system resolving the carrier cycle ambiguities over the capture window to a single solution set and determining the position of the rover GNSS receiver to an accuracy within centimeters using the resolved carrier phase measurements. | 05-05-2011 |
20110109503 | Partial Ambiguity Fixing For Multi-Frequency Ionospheric Delay Estimation - A method is suggested for robust estimation of a subset of carrier phase integer ambiguities for precise ionospheric delay estimation. The advantages of this method are the precise estimation of receiver and satellite biases, an increase in the number of reliably fixable ambiguities, and an improved accuracy for the ionospheric delay estimation. | 05-12-2011 |
20110115669 | Detection and Correction of Anomalous Measurements and Ambiguity Resolution in a Global ... - A global navigation system includes a first navigation receiver located in a rover and a second navigation receiver located in a base station. Single differences of measurements of satellite signals received at the two receivers are calculated and compared to single differences derived from an observation model. Anomalous measurements are detected and removed prior to performing computations for determining the output position of the rover and resolving integer ambiguities. Detection criteria are based on the residuals between the calculated and the derived single differences. For resolving integer ambiguities, computations based on Cholessky information Kalman filters and Householder transformations are advantageously applied. Changes in the state of the satellite constellation from one epoch to another are included in the computations. | 05-19-2011 |
20110122020 | METHOD FOR A GLOBAL SATELLITE NAVIGATION SYSTEM - A method for estimating satellite-satellite single difference biases is described. The method uses an ionosphere-free mixed code-carrier combination of maximum ambiguities discrimination defined at the ration between wavelength and noise standard deviation. The accuracy of the biases estimation is further improved by an additional ionosphere-free mixed code-carrier combination of time-difference measurement that is uncorrelated with the first combination. Finally, an alternative method is based on a combination of carrier signals in a common frequency band which allows estimating the biases individually. | 05-26-2011 |
20110140958 | METHOD FOR DETERMINING BIASES OF SATELLITE SIGNALS - A new method for bias estimation on multiple frequencies with a Kalman filter is proposed. It consists of four steps: First, a least-squares estimation of ranges, ionospheric delays, ambiguities, receiver phase biases and satellite phase biases is performed. The code biases are absorbed in the ranges and ionospheric delays, and a subset of ambiguities is mapped to the phase biases to remove linear dependencies between the unknown parameters. In a second step, the accuracy of the bias estimates is efficiently improved by a Kalman filter. The real-valued a posteriori ambiguity estimates are decorrelated by an integer ambiguity transformation to reduce the time of ambiguity resolution. Once the float ambiguities have sufficiently converged, they are fixed sequentially in a third step. Finally, a second Kalman filter is used to separate the receiver and satellite code biases and the tropospheric delays from the ranges. | 06-16-2011 |
20110140959 | GNSS Signal Processing Methods and Apparatus with Ambiguity Selection - Methods and apparatus are provided for estimating parameters, i.e. ambiguities, derived from GNSS signals. Observations of a GNSS signal from each of a plurality of GNSS satellites are obtained ( | 06-16-2011 |
20110148698 | GNSS Signal Processing Methods and Apparatus with Scaling of Quality Measure - Methods and apparatus are provided for estimating parameters, i.e. ambiguities, derived from GNSS signals. Observations of GNSS signals are obtained from each of a plurality of GNSS satellites ( | 06-23-2011 |
20110156949 | GNSS Signal Processing Methods and Apparatus with Tracking Interruption - Methods and apparatus are provided for estimating parameters, i.e. ambiguities, derived from GNSS signals. Observations of each of received frequencies of a GNSS signal from a plurality of GNSS satellites are obtained for a plurality of instances in time ( | 06-30-2011 |
20110181464 | Method of Position Determination in a Global Navigation Satellite System (GNSS) Receiver - A method of determining coordinates of a mobile Global Navigation Satellite System (GNSS) receiver includes processing signals from space vehicles including performing measurements of pseudoranges and Doppler shift, extracting ephemeris data, and determining GNSS receiver coordinates from said measurements. | 07-28-2011 |
20110187590 | Position Estimation Methods and Apparatus - A method of determining the position of a GNSS receiver antenna includes steps of acquiring input data which includes observations at the GNSS receiver antenna of signals of at least clock and position information of GNSS satellites, for each of a plurality of epochs. Float parameters of a state vector from the input data of each epoch are then estimated. The float parameters include receiver antenna position, receiver clock, and at least one ambiguity per satellite. A jump in the at least one ambiguity of at least one satellite from one epoch to another epoch is detected. Then bridge parameters from the input data of at least one epoch and from the estimated float parameters are estimated. The bridge parameters include values sufficient to update the float parameters to compensate for the jump, and the bridge parameters are then used to update the float parameters. | 08-04-2011 |
20110210888 | PROCESSING OF RADIONAVIGATION SIGNALS USING A WIDE-LANE COMBINATION - A method for processing radionavigation signals coming from satellites that broadcast the radionavigation signals on at least two distinct frequencies, comprises
| 09-01-2011 |
20110260914 | GNSS Signal Processing Methods and Apparatus With Candidate Set Selection - Methods and apparatus are provided for estimating parameters, i.e. ambiguities, derived from GNSS signals. Observations of GNSS signals are obtained from each of a plurality of GNSS satellites ( | 10-27-2011 |
20110267225 | SYSTEM AND METHOD FOR DETERMINING THE HEADING ANGLE OF A VEHICLE - A system and method for determining the heading angle of a vehicle includes first and second antennas associated with the vehicle. The first and second antennas are configured to receive signals comprising global positioning system data. A receiver front end is configured to receive the signals comprising global positioning system data. An electronic data processor is capable of receiving the global positioning system data from the receiver front end. The data processor is configured or programmed to execute a method to determine the attitude of the vehicle which may include the heading angle of the vehicle. | 11-03-2011 |
20110267226 | GNSS Signal Processing Methods and Apparatus with Ambiguity Convergence Indication - Methods and apparatus are provided for estimating parameters, i.e. ambiguities, derived from GNSS signals. Observations of a GNSS signal from each of a plurality of GNSS satellites are obtained ( | 11-03-2011 |
20110267227 | SYSTEM AND METHOD FOR DETERMINING THE HEADING ANGLE OF A VEHICLE - A system and method for determining the heading angle of a vehicle includes first and second antennas associated with the vehicle. The first and second antennas are configured to receive signals comprising global positioning system data. A receiver front end is configured to receive the signals comprising global positioning system data. An electronic data processor is capable of receiving the global positioning system data from the receiver front end. The data processor is configured or programmed to execute a method to determine the attitude of the vehicle which may include the heading angle of the vehicle. | 11-03-2011 |
20110267228 | GNSS Signal Processing Methods and Apparatus with Geometric Filter - Methods and apparatus are provided for processing a set of GNSS signal data derived from signals of a first set of satellites having at least three carriers and signals of a second set of satellites having two carriers. A geometry filter uses a geometry filter combination to obtain an array of geometry-filter ambiguity estimates for the geometry filter combination and associated statistical information. Ionosphere filters use a two-frequency ionospheric combination to obtain an array of ionosphere-filter ambiguity estimates for the two-frequency ionospheric combinations and associated statistical information. Each two-frequency ionospheric combination comprises a geometry-free two-frequency ionospheric residual carrier-phase combination of observations of a first frequency and observations of a second frequency. Auxiliary ionosphere filters use an auxiliary ionospheric combination to obtain an array of auxiliary-ionosphere-filter ambiguity estimates for the auxiliary ionospheric combinations and associated statistical information. Each auxiliary ionospheric combination uses carrier-phase observations of a third frequency and carrier-phase observations of at least one of the first frequency and the second frequency. A combined array of ambiguity estimates is prepared for all carrier phase observations and associated statistical information by combining the arrays of the geometry filter and the ionosphere filters and the auxiliary ionosphere filters. | 11-03-2011 |
20120026035 | Method for Resolving Sub-Carrier Ambiguities of a Number of Tracking Channels of a Navigation Signal - A method for resolving sub-carrier ambiguities of a total number of tracking channels of a binary offset carrier (BOC) navigation signal is provided. For a simultaneously considered subset of at least four tracking channels, a set of sub-carrier candidate ambiguities is determined based on the sub-carrier modulation. Position and receiver clock error are calculated for each possible combination of sub-carrier ambiguities. Predicted delays are calculated based on each calculated position and receiver clock error. Differences between the predicted delays and the delay candidates originating from each specific combination of subcarrier ambiguities are calculated. A residual is calculated based on the differences and the set of sub-carrier ambiguities and the corresponding position and receiver clock error leading to the smallest residual are selected. | 02-02-2012 |
20120154214 | GNSS Signal Processing with Rover Ambiguity Fixing - Methods and apparatus are described for processing a set of GNSS signal data derived from signals of a set of satellites having carriers observed at a rover antenna, wherein the data includes a carrier observation and a code observation of each carrier of each satellite, comprising: obtaining for each satellite clock corrections comprising at least two of: (i) a code-leveled satellite clock, (ii) a phase-leveled satellite clock, and (iii) a satellite clock bias representing a difference between a code-leveled satellite clock and a phase-leveled satellite clock, running a first filter which uses at least the GNSS signal data and the satellite clock corrections to estimate values for parameters comprising at least one carrier ambiguity for each satellite, and a covariance matrix of the carrier ambiguities, determining from each carrier ambiguity an integer-nature carrier ambiguity comprising one of: an integer value, and a combination of integer candidates, inserting the integer-nature carrier ambiguities as pseudo-observations into a second filter, and applying the second filter to the GNSS signal data and the satellite clock corrections to obtain estimated values for parameters comprising at least the position of the receiver. | 06-21-2012 |
20130002482 | METHOD AND APPARATUS FOR IONOSPHERE DEPLETION DETECTION - A method of detecting a plasma depletion in the ionosphere includes comparing the large scale ionosphere trend with a local temporal slope of vertical or slant delay. In one example, the local temporal slope of delay is calculated phase data extracted from GPS signals at a GPS receiver, and the large scale trend is determined from broadcast ionosphere grid point delay data. | 01-03-2013 |
20130044026 | GNSS Signal Processing with Ionosphere Model for Synthetic Reference Data - Some embodiments of the present invention derive an ionospheric phase bias and an ionospheric differential code bias (DCB) using an absolute ionosphere model, which can be estimated from data obtained from a network of reference stations or obtained from an external source such as WAAS, GAIM, IONEX or other. Fully synthetic reference station data is generated using the ionospheric phase bias and/or the differential code bias together with the phase leveled clock and ionospheric-free code bias and/or MW bias. | 02-21-2013 |
20130050020 | METHOD TO HANDLE SINGLE FAILURE GPS FAULTS IN HIGH INTEGRITY RELATIVE POSITIONING SYSTEMS - A method and system to handle single failure GPS faults in high integrity relative positioning systems is provided. The system is configured to receive a number of reference measurements in carrier-phase real time kinetic positioning systems and identify if a single fault exists. The system identifies the type of fault and mitigates the effects of the single fault to provide a positioning system with a high integrity that is suitable for applications involving risk to human lives. | 02-28-2013 |
20130120187 | METHOD AND SYSTEM FOR ESTIMATING POSITION WITH BIAS COMPENSATION - A primary phase measurement device measures a first carrier phase of a first carrier signal and a second carrier phase of a second carrier signal received by the location-determining receiver. A secondary phase measurement device measures the third carrier phase of a third carrier signal and the fourth carrier phase of fourth carrier signal. A real time kinematic engine estimates a first integer ambiguity set associated with the measured first carrier phase, and a second integer ambiguity set associated with the measured second carrier phase. The real time kinematic engine estimates a third ambiguity set associated with the measured third carrier phase and a fourth ambiguity set associated with the measured fourth carrier phase. A compensator is capable of compensating for the inter-channel bias in at least one of the third ambiguity set and the fourth ambiguity set by modeling a predictive filter (e.g., Kalman filter) in accordance with various inputs or states of the filter estimated by an estimator: | 05-16-2013 |
20130135145 | POSITIONING DEVICE AND STORAGE MEDIUM - An equation derivation section derives an observation equation that employs M epochs worth of GPS data and INS data as observation values to derive for each of the GPS satellites a float solution for number of waves of GPS data carrier wave between each of plural GPS satellites and a vehicle, wherein the range of float solutions of the number of waves is constrained by the vehicle travel path estimated based on M epochs worth of INS data. The observation equation is solved by a float solution computation section and float solutions computed for the number of waves N and the position of the vehicle for each of the GPS satellites. Fixed solutions with highest consistency are computed by a fixed solution computation section based on the float solutions for the number of waves N for each of the GPS satellites and the position of the vehicle. | 05-30-2013 |
20130241768 | GNSS POSITIONING SYSTEM INCLUDING AN ANTI-JAMMING ANTENNA AND UTILIZING PHASE CENTER CORRECTED CARRIER - A carrier phase correction sub-system for use with a GNSS receiver that utilizes an active null and beam steering controlled radiation pattern antenna (CRPA) determines carrier phase corrections that compensate for antenna phase center movements in the carrier phase measurements taken from the CRPA filtered signal. The carrier phase sub-system utilizes measured radiation patterns, angles of incidence of the satellite signals at the CRPA, and the applied weights to determine carrier phase corrections to be applied to the CRPA filtered signals from which the carrier phase measurements are later taken or to the carrier phase measurements depending on the dynamics of the jamming signal. With the carrier phase corrected, the GNSS receiver may utilize known RTK techniques to resolve carrier cycle ambiguities. | 09-19-2013 |
20130265192 | METHOD AND SYSTEM FOR ESTIMATING POSITION USING DUAL REAL TIME KINEMATIC ENGINES - A method and system for estimating the position comprises measuring a first carrier phase of a first carrier signal and a second carrier phase of a second carrier signal received by a location-determining receiver. A primary real time kinematic (RTK) engine or receiver data processing system estimates a primary integer ambiguity set associated with at least one of the measured first carrier phase and the measured second carder phase. A quality evaluator determines if a primary integer ambiguity set is resolved correctly to the predefined reliability rate during an earlier evaluation period. A secondary real time kinematic (RTK) engine or receiver data processing system estimates a secondary integer ambiguity set associated with at least one of the measured first carrier phase and the measured second carrier phase during a later period following the earlier evaluation period. | 10-10-2013 |
20140002299 | COMBINED CYCLE SLIP INDICATORS FOR REGIONALLY AUGMENTED GNSS | 01-02-2014 |
20140002300 | GNSS Signal Processing with Known Position for Reconvergence | 01-02-2014 |
20140015712 | GNSS Signal Processing with Ionospheric Bridging for Reconvergence - Methods and apparatus provide for positioning of a rover antenna from GNSS data derived from multi-frequency signals and correction data derived from a network of reference stations. Rover antenna position and multi-frequency ambiguities are estimated at each epoch. An ionospheric filter models variation in ionospheric bias per satellite. A set of ionospheric carrier-phase ambiguities is estimated at least when the multi-frequency ambiguities have attained a predetermined precision. The estimated ionospheric carrier-phase ambiguities are cached. After detecting interruption of signal at the rover antenna and determining reacquisition of signals at the rover antenna, an ionospheric bias per satellite over an interruption interval is predicted. For each satellite, a cached ionospheric carrier-phase ambiguity is combined with a predicted ionospheric bias to obtain a post-interruption ionospheric ambiguity estimate. The post-interruption ionospheric ambiguity estimates are used to aid estimation of rover antenna position after signal reacquisition. | 01-16-2014 |
20140043187 | LOW LATENCY CENTRALIZED RTK SYSTEM - A low-latency centralized RTK system utilizes an RTK server to perform matched updates using base station GNSS measurements from one or more base stations and GNSS measurements from one or more rovers, and the one or more rovers produce RTK solutions based on the results of the matched updates. The RTK server includes one or more processors that perform the matched updates and a transmitter that transmits at least the ambiguities to the rovers. The respective rovers, which have processing power that is sufficient to quickly calculate RTK baselines, utilize the received ambiguities, the base station GNSS measurements received from either the RTK server or the base stations, known base station positions and instantaneous GNSS measurements at the rovers to readily determine and update their RTK baselines and their precise positions. | 02-13-2014 |
20140085139 | GLOBAL NAVIGATION SATELLITE SYSTEMS (GNSS) POSITIONING USING PRECISE SATELLITE DATA - Method to estimate parameters derived at least from GNSS signals useful to determine a position, including obtaining at least one GNSS signal observed at a GNSS receiver from each of a plurality of GNSS satellites; receiving global correction information useful to correct at least the obtained GNSS signals from a first set of GNSS satellites, wherein the global correction information includes correction information which is independent from the position to be determined; receiving local correction information useful to correct at least the obtained GNSS signals from a second set of GNSS satellites, wherein the local correction information includes correction information which is dependent on the position to be determined; processing the obtained GNSS signals from the first set of GNSS satellites by using the global correction information; and processing the obtained GNSS signals from the second set of GNSS satellites by using the local correction information. | 03-27-2014 |
20140247183 | SATELLITE-BASED INTEGER CYCLE AMBIGUITY RESOLUTION OF LOCAL MEDIUM WAVE RADIO SIGNALS - A system and methods for resolving integer cycle ambiguity in medium wave carrier radio signals are presented. A satellite signal is received at a receiving location and a measured code phase of the satellite signal is measured. A satellite location estimate of the receiving location is computed based on the measured code phase. Medium wave radio carrier signals from medium wave radio transmitters are received at the receiving location. A number of wavelengths of the medium wave radio carrier signals from the satellite location estimate to each of the medium wave radio transmitters is determined respectively. A carrier phase of each of the medium wave radio carrier signals is measured. An improved position estimate of the receiving location is computed based on the number of wavelengths and the carrier phase of each of the medium wave radio carrier signals, and a location of each of the medium wave radio transmitters. | 09-04-2014 |
20150293233 | PPP-RTK METHOD AND SYSTEM FOR GNSS SIGNAL BASED POSITION DETERMINATION - GNS signal correction system and method for calculating GNSS corrections, and complementary mobile and mobile position determination method based on these GNSS corrections. The methods employ satellite-single-differenced mixed code-and-phase system hardware delays in modelling carrier phase system observables. These system hardware delays are dynamically estimated by the signal correction system using a dynamic system state model. The estimated system hardware delays are transmitted to the mobile, which applies these delays to a dynamic mobile state model, in order to improve the accuracy and/or convergence time of mobile position estimations. | 10-15-2015 |
20150355341 | SYSTEM AND METHOD FOR PROVIDING INFORMATION FROM REFERENCE STATIONS TO ROVER RECEIVERS IN A SATELLITE NAVIGATION SYSTEM - A navigation satellite system, one or more NSS reference station is set out for providing information to one or more rover receivers. The NSS reference station comprises a processing unit configured to determine one or more first range intervals representing first ambiguity windows based on estimated atmospheric effects, and determine one or more second range intervals representing a second ambiguity window smaller than each of the first ambiguity windows based on uncertainties of range measurements within a predetermined previous period. The NSS reference station further comprises a transmission unit configured to transmit, to the NSS rover receivers, first messages each comprising a modulo a first ambiguity window, and transmission of two first messages, to range measurement transmit between the NSS rover receiver, a plurality of second messages, each second message comprising a range measurement modulo one of the second ambiguity windows. | 12-10-2015 |
20160011314 | GNSS SIGNAL PROCESSING WITH IONOSPHERE MODEL FOR SYNTHETIC REFERENCE DATA | 01-14-2016 |
20160018530 | GNSS SURVEYING USING RTK ENGINE VERTIFICATION - Systems and methods for performing land surveying using real-time kinematic (RTK) engine verification are provided. In one example, a first set of positions of a GNSS receiver may be determined using each of a plurality of RTK engines. If a number of the plurality of RTK engines that produce a fixed solution is greater than or equal to a threshold value, a position of the GNSS receiver may be determined based on at least a portion of the first set of positions. The determined position may then be stored. This process may be repeated any number of times to produce a desired number of stored positions. In response to the number of stored positions being equal to a minimum value, a final position of the GNSS device may be determined based on the stored positions. | 01-21-2016 |
20160077213 | INTEGER AMBIGUITY-FIXED PRECISE POINT POSITIONING METHOD AND SYSTEM - A method for providing and applying Precise Point Positioning-Integer Ambiguity Resolution (PPP-IAR) corrections for a Global Navigation Satellite System (GNSS). In a GNS signal correction system, PPP-IAR corrections (ambiguities plus receiver and satellite hardware delays) are calculated based on observation data (P | 03-17-2016 |
20160077214 | PRECISE GNSS POSITIONING SYSTEM WITH IMPROVED AMBIGUITY ESTIMATION - Method for precise GNSS positioning system with improved ambiguity estimation. The method is based on the realization that, especially during convergence, the estimated float ambiguities are biased when estimated simultaneously with the ionosphere parameters. The “ionosphere-like” biases can be separated from the actual float ambiguities by using the fixed wide-lane (or extra wide-lane) integer ambiguities. The original real-valued ambiguities (e.g., one of L1, L2 and L5 in the GPS case) are corrected using the corresponding biases, resulting in reliable float ambiguities that are taken as input in the next processing step. | 03-17-2016 |
20160116601 | SYSTEMS AND METHODS FOR REAL TIME KINEMATIC SATELLITE POSITIONING - A method for Real Time Kinematic satellite positioning includes receiving navigation satellite carrier signals, receiving phase correction signals from a reference station, calculating a set of integer phase ambiguities from double-differenced measurements of pseudo-range and phase, and calculating a relative position of the mobile receiver from the set of integer phase ambiguities and the double-differenced measurements of pseudo-range and phase. | 04-28-2016 |
20160161614 | PSEUDORANGE DETERMINATOR, METHOD FOR PROVIDING A PSEUDORANGE INFORMATION AND COMPUTER PROGRAM - A pseudorange determinator for providing a pseudorange information representing an estimate of a distance between a transmitter and a receiver on the basis of a modulated signal having a sequence of symbols, wherein a primary code sequence is modulated in accordance with a secondary code sequence is configured to step-wisely correlate a portion of a received signal having at least two symbols with at least two reference sequences, a first reference sequence representing at least two subsequent symbols having same phases and a second reference sequence representing at least two subsequent symbols having different phases, to step-wisely acquire, in dependence on a result of the correlations, a portion of the secondary code sequence. The pseudorange determinator is configured to provide the pseudorange information on the basis of an acquisition of a meaningful portion of the secondary code sequence. | 06-09-2016 |
20160377729 | GNSS RECEIVER WITH AN IMPROVED CAPABILITY TO RESOLVE SUB-CARRIER TRACKING AMBIGUITIES - A GNSS receiver and the associated method, for calculating an unbiased position and time measurement from a plurality of satellite positioning signals, the receiver comprising:
| 12-29-2016 |