Abstract: A method for controlling a global navigation satellite system (GNSS) receiver operated in a first operation state includes: providing a state switching criterion; obtaining a positioning information; determining whether to switch from the first operation state to a second operation state according to the obtained positioning information and the state switching criterion, wherein the power consumption of the GNSS receiver operating under the first operation state and the second operation state is different.

Abstract: The number of messages required in networks where both location and presence services are deployed may be reduced, by retrieving presence data from messages otherwise intended to provide only location information. Thus, information determined in a location service scheme is utilized to provide a presence service as well. A location server requests mobile subscriber (MS) information from a Core Network (CN) Node (i.e. HLR, MSC, etc.) that can be used in determining the Location of the MS. A single message aggregates retrieval of information for two services, specifically, for both location and presence.

Abstract: 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 system for mode switching between a navigational signal; and power control module for receiver.

Abstract: A method of processing signals from a satellite positioning system, comprises receiving (50) recorded blocks of data samples of satellite broadcast, each block including one or more timestamps generated within a receiver at which the samples were recorded, and processing (52) the recorded blocks of data samples using a first set of processing parameters to identify satellite transmissions contained within the blocks. Based on the results of the processing (52), one of the blocks is selected (56,58). The selected block is processed (60) using a second set of processing parameters to derive at least position and satellite broadcast timing information. The timestamp of the selected block and the timing information obtained from the processing (60) of the selected block is used to assist in the processing (60) of the other blocks.

Abstract: A method for supporting location services in a mobile radio communications system, in which method a mobile station receives from at least one network element involved in location services, for the implementation of a position measurement procedure, at least one information element indicating if the method type required for that position measurement procedure is a “Conventional GPS” method type where the mobile station behaves as a conventional satellite positioning system receiver.

Abstract: A satellite signal receiver 40 comprises a measurement component 43 adapted to perform measurements on received satellite signals. In order to enable an enhanced handling of the measurements, the receiver further comprises a first processing unit 44 adapted to run a software 45 for controlling the measurement component 43 based on received control parameters. In addition, it comprises a first interface component 46 adapted to receive control parameters via another interface component 34 from another processing unit 35, adapted to provide the control parameters to the first processing unit 44 and adapted to forward measurement results from the measurement component 43 via the other interface component 34 to the other processing unit 35.

Abstract: A method is provided whereby a group of receivers local to one another make GNSS measurements of a number of satellites, from one or multiple different GNSS's, and by combining the measurements of the same satellites made by the different receivers it is possible given sufficient conditions to determine the positions of the receivers and the satellite errors such that the positions obtained are equivalent to those obtained from a traditional differential GNSS system, without the need for a static reference receiver at a known location.

Abstract: A method of determining a location of an event of interest by processing signals from a satellite positioning system comprises periodically recording blocks of data samples of a satellite broadcast. In response to a request for a position determination at a particular time, a most recent block of data samples is processed in an attempt to obtain a position fix. If unsuccessful, the method further comprises processing blocks of data samples which were recorded further back in time in a sequence to make further attempts to obtain a position fix, until a position fix is obtained. The blocks of data samples used for the further attempts are irregularly spaced in time, for example more densely populated in relatively recent time than in relatively ancient time with respect to the particular time. This enables the processing resource in attempting to obtain a position fix to be allocated efficiently, thereby reducing power consumption.

Abstract: Disclosed herein is a Satellite Based Augmentation System (SBAS) receiver. The SBAS receiver is configured to receive SBAS messages containing augmentation data and to provide one or more served GPS receivers with augmentation information based on the augmentation data extracted from the received SBAS messages. The SBAS receiver is designed to implement a Finite State Machine (FSM) intended to be common to all served GPS receivers, and configured to evolve based on the received SBAS messages and to store the augmentation data contained therein. The common FSM is further configured to cooperate with a number of correction modules equal to the number of served GPS receivers, each correction module being configured to receive GPS data from a corresponding served GPS receiver, and to compute an augmented position for the corresponding served GPS receiver based on the corresponding GPS data and on augmentation data retrieved from the common FSM.

Abstract: A global positioning satellite (GPS) receiver that includes a radio frequency (RF) receiver receiving a first GPS signal from a GPS satellite and a processor. The processor is configured to correlate the first GPS signal with a plurality of reference signals to produce a plurality of correlations, detect a transition between receiving the first GPS signal and receiving a second GPS signal from the GPS satellite based on a phase shift in the correlations, and if the transition is detected, compensate for the phase shift when computing a range to the GPS satellite.

Abstract: 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.

Abstract: A GNSS system operates intermittently and has adaptive activity and sleep time in order to reduce power consumption. The GNSS system provides an enhanced estimate of its position in the absence of GNSS signals of sufficient strength. The user's activity and behavior is modeled and used to improve performance, response time, and power consumption of the GNSS system. The user model is based, in part, on the received GNSS signals, a history of the user's positions, velocity, time, and inputs from other sensors disposed in the GNSS system, as well as data related to the network. During each activity time, the GNSS receiver performs either tracking, or acquisition followed by tracking. The GNSS receiver supports both normal acquisition as well as low-power acquisition.

Abstract: The number of messages required in networks where both location and presence services are deployed may be reduced, by retrieving presence data from messages otherwise intended to provide only location information. Thus, information determined in a location service scheme is utilized to provide a presence service as well. A location server requests mobile subscriber (MS) information from a Core Network (CN) Node (i.e. HLR, MSC, etc.) that can be used in determining the Location of the MS. A single message aggregates retrieval of information for two services, specifically, for both location and presence.

Abstract: A system implements a location based service, and comprises a satellite navigation receiver implementing a position tracking function for providing the location of a user of the service. An analogue RF receiver receives satellite signals and performs at least a frequency downconversion. Correlation and decoding functions are applied to the downconverted signals for deriving location information from detected specific satellite signals. The system further comprises a server for receiving samples of the downconverted signals, and for verifying the samples are consistent with the expected satellite signals at that time and location. The invention provides a counter measure for detecting the counterfeiting of, or tampering with, the satellite signals at the receiver. A check can be made that the received satellite signals correspond to those which are expected at that location and time.

Abstract: A wireless receiver for multiple frequency bands reception includes a single receive radio frequency (RF) circuit (160, 170) having an RF bandpass substantially confined to encompass at least two non-overlapped such frequency bands at RF, a single in-phase and quadrature (approximately I, Q) pair of intermediate frequency (IF) sections (120I, 120Q) having an IF passband, and a mixer circuit (110) including an in-phase and quadrature (I,Q) pair of mixers (110I, 110Q) fed by said RF circuit (160, 170) and having a local oscillator (100) with in-phase and quadrature outputs coupled to said mixers (110I, 110Q) respectively, said mixer circuit (110) operable to inject and substantially overlap the at least two non-overlapped frequency bands with each other into the IQ IF sections (120I, 120Q) in the IF passband, the IF passband substantially confined to a bandwidth encompassing the thereby-overlapped frequency bands.

Abstract: A combined GPS and GLONASS receiver receives GPS signals and GLONASS signals. A calibration signal is generated utilizing the received GPS signals and/or the received GLONASS signals to offset group delay errors in the received GLONASS signals. The generated calibration signal is filtered through Kalman filters to estimate group delay variations in the received GLONASS signals. The estimated group error delay variations are combined with the received GLONASS signals to calibrate the received GLONASS signals by offsetting the estimated group error delay variations. When GPS signals are not available for use, the combined GPS and GLONASS receiver obtains group delay errors stored or in the received GLONASS signals to estimate calibration coefficients. The estimate calibration coefficients are updated utilizing received GPS and/or GLONASS signals.

Abstract: A system and method for determining the location of a mobile device. A first set of signals from a plurality of radio frequency (“RF”) sources may be received at a mobile device and then downconverted into a second set of signals. The mobile device may then time stamp the second set of signals and transmit the time stamped signals to a location determining system. The location of the mobile device may be determined at the location determining system as a function of the time stamped signals.

Abstract: A geographic tracking system with minimal power and size required at the mobile terminal collects observation data at the mobile terminal, forwards the data to a processor, which calculates the position. The mobile terminal needs only to gather a few milliseconds of observation data, and to relay this observation data to the processor. In one embodiment, the observation data is communicated to the processor using either a satellite communication network or through a mobile telephone network.

Abstract: A method implemented by an assisted Global Navigation Satellite System (GNSS) server determines a position of a GNSS receiver. The method includes sending a request for measurement information to the GNSS receiver at a first time and receiving the measurement information from the GNSS receiver in response to the request at a second time, where the measurement information includes position measurement data and a corresponding measured time based on satellite signals received by the GNSS receiver. The measured time is determined to be erroneous when it is outside an accurate time range determined based on at least one of the first time and the second time. A substitute time is identified and the position of the GNSS receiver is determined based on the substitute time when the measured time is erroneous.

Abstract: Method of geolocation employing hybridization of a satellite navigation system and a data collection system. The method minimizes processing time by the means equipping the objects to be geolocated, given the processing effected in “masked time” by remote equipment, typically ground stations of the data collection system. To this end, the method necessitates only acquisition of the code phase of the positioning information coming from the satellite navigation system.

Abstract: A GPS, GLONASS 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 graphics or sound processor. The receiver thus makes use of available computing resources, thus achieving a lower bill of material.

Abstract: 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 (21) of the cellular communications system (1), preferably by filtering of measurements received from user equipments. Linear trend Kalman filtering followed by post processing of estimation errors is presently preferred. In order to ensure non-ambiguous interpretation of the received time stamps of received satellite signals (55) provided by user equipments (10), a pseudo propagation delay is computed in both the user equipment (10) and the positioning node (21) based on GPS acquisition assistance data. The GPS time stamp is then defined referring to the determined pseudo propagation delay. In a preferred embodiment, the pseudo propagation delay is assured to be situated within a pre-determined time interval.

Abstract: A method for acquiring positioning information includes receiving downlink data in a plurality of downlink slot frames, and receiving at a mobile terminal within one of the downlink slot frames, broadcasted global positioning system (GPS) orbital description data. The GPS orbital description data information relates to a first group of orbiting satellites within operable range of the base station (BS) providing the broadcasting of the GPS orbital description data. The method further includes performing GPS-based positioning for the mobile terminal based upon signaling received from a second group of a plurality of orbiting satellites in conjunction with the GPS orbital description data, such that at least one of the second group of the plurality of orbiting satellites is the same as some or all of the orbiting satellites of the first group.

Abstract: A method and apparatus for background decoding of a broadcast satellite-navigation message to maintain integrity of long-term-orbit information used in a Global-Navigation-Satellite System or other positioning system is described. The method may include processing the long-term-orbit information associated with at least one satellite to obtain a first position of a receiver; obtaining at least one portion of broadcast ephemeris transmitted from the at least one satellite; and processing, as a substitute for at least one portion of the long-term-orbit information, the at least one portion of broadcast ephemeris to obtain a second position of the receiver.

Abstract: An evaluation point E of a present position candidate corresponding to each satellite set is calculated based on an a priori residual (APR) (APR value), a PDOP value, and the number of satellites of the target satellite set according to E=k1·f1(APR)+k2·f2(PDOP)+k3·f3(number of satellites). Evaluation coefficients k1 to k3 for respectively weighting evaluation functions f1 to f3 are determined based on an APR average value.

Abstract: Satellite positioning system (SATPS) receiver that has a plurality of modes and channels, where a timeline module configures the channels based on the mode of operation of the SATPS receiver and reconfigures the channels if the mode of operation of the SATPS changes.

Abstract: A system and method for determining the location of a mobile device. A first set of signals from a plurality of radio frequency (“RF”) sources may be received at a mobile device and then downconverted into a second set of signals. The mobile device may then time stamp the second set of signals and transmit the time stamped signals to a location determining system. The location of the mobile device may be determined at the location determining system as a function of the time stamped signals.

Abstract: This disclosure is directed to systems and methods for providing GPS positioning determinations from a single set of Doppler measurements from a plurality of satellites in conjunction with satellite ephemeris data and a rough GPS time estimate. Measured Doppler velocities are compared with Doppler velocities calculated from ephemeris data and used to estimate the receiver position.

Abstract: Real-time location tracking apparatus and method using a global positioning system (GPS) signal relay tag is provided. Here, a tag may receive a GPS signal and transmit the received GPS signal to a reader, and the reader may calculate a location of the tag, and thereby a real-time location tracking service may be provided.

Abstract: This disclosure describes methods and systems for stationary user detection in a hybrid location system. In some embodiments, the method for determining whether a satellite enabled device is stationary by measuring the Doppler frequency of received satellite signals can include acquiring satellite measurements from at least two satellites, wherein the satellite measurements include Doppler frequency measurements, acquiring a rough estimate of location of the satellite enabled device and calculating an internal frequency offset of satellite enabled device.

Abstract: 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.

Abstract: Methods and apparatuses for processing correction messages in a GNSS receiver are provided. One of the proposed methods includes providing a first storage unit; receiving a plurality of correction messages from at least one data sources, wherein a plurality of assistance data are carried by the plurality of correction messages; and storing a portion of the assistance data in the first storage unit without storing remaining assistance data in the GNSS receiver.

Abstract: 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.

Abstract: A receiver that receives a plurality of signals that are modulated with a common carrier, where each signal of said signals originates at a different source and experiences a transit delay and Doppler frequency shift before reaching the receiver, and where the transit delay and Doppler frequency shift are related to position and movement of each of the respective sources. The receiver includes means, such as a directional antenna, to ensure that the received signals are bona fide, or at least not subject to the same bogus signal or signals to which a second receiver may be subjected.

Abstract: Techniques for supporting periodic and other location services with Secure User Plane Location (SUPL) and other location architectures are described. The techniques can provide position estimates for a SUPL enabled terminal (SET) to a SUPL agent periodically and/or based on trigger events. A Home SUPL Location Platform (H-SLP) receives from the SUPL agent a request for position estimates for the SET. The H-SLP starts a SUPL location session with the SET. For each of at least one reporting event during the location session, the H-SLP obtains a position estimate for the SET and sends the position estimate to the SUPL agent. The position estimate may be derived by the SET and sent to the H-SLP. Alternatively, the position estimate may be derived by the H-SLP based on measurements from the SET.

Abstract: Aspects of a method and system for customized full ephemeris compatible with standard AGPS network devices allows a GPS enabled handset to receive real-time full ephemeris from an AGPS server for calculating a position fix. The real-time full ephemeris may be generated at the AGPS server in response to one or more request for real-time full ephemeris from the GPS enabled handset. The AGPS server may be configured to provide fresh full ephemeris generated at smaller intervals such as every 10-15 minutes as approximated real-time full ephemeris. The generated real-time full ephemeris or fresh full ephemeris may be communicated to the GPS enabled handset periodically or aperiodically. Various predicted real-time full ephemeris or predicted fresh full ephemeris compatible with various standards may be generated via Short Term Orbits (STO) technology.

Abstract: 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.

Abstract: The number of messages required in networks where both location and presence services are deployed may be reduced, by retrieving presence data from messages otherwise intended to provide only location information. Thus, information determined in a location service scheme is utilized to provide a presence service as well. A location server requests mobile subscriber (MS) information from a Core Network (CN) Node (i.e. HLR, MSC, etc.) that can be used in determining the Location of the MS. A single message aggregates retrieval of information for two services, specifically, for both location and presence.

Abstract: 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.

Abstract: A receiver for continuous carrier phase tracking of low carrier-to-noise ratio (“CNR”) signals from a plurality of radio navigation satellites while the receiver is mobile. The receiver may have: a radio frequency (RF) front-end that provides satellite data corresponding to signals received from the plurality of radio navigation satellites; an inertial measurement unit (IMU) that provides inertial data; and a processor circuit in circuit communication with the RF front end and the IMU, the processor circuit being capable of using satellite data from the RF front-end and inertial data from the IMU to perform continuous carrier phase tracking of low CNR radio navigation satellite signals having a CNR of about 20 dB-Hz, while the receiver is mobile. The receiver may be a GPS receiver for continuous carrier phase tracking of low-CNR GPS signals.

Abstract: A method for reducing Time To First Fix (TTFF) of a Global Navigation Satellite System (GNSS) receiver includes storing ephemeris information into a non-volatile memory, and utilizing the ephemeris information to determine a GNSS time, in order to reduce the TTFF. An apparatus for reducing TTFF of a GNSS receiver includes a storage module and a processing module coupled to the storage module. The storage module is utilized for storing data, wherein the stored data in the storage module is non-volatile. The processing module stores ephemeris information into the storage module and utilizes the ephemeris information to determine a GNSS time, in order to reduce the TTFF.

Abstract: A system and process for the geo-location of an asset given no a priori knowledge regarding time and location of the asset with minimized power consumption is disclosed. In the preferred embodiment, the system is accurate to about 30 meters CEP (50% circular error probable) using just a short segment, e.g., 100-200 ms, of digitized GPS L1 signal data.

Abstract: A receiver terminal receives a frequency from an external reference oscillator portion, which is more accurate than that of a frequency generated within the receiver in a local oscillator portion. The frequency from the local oscillator portion is measured using the external frequency as the reference, which determines the error in the local oscillator frequency relative to the external reference and permits the local oscillator frequency to be corrected to within the error of the external oscillator frequency. A plurality of candidate values for the remaining local frequency error are selected within a predetermined frequency range to include any remaining error of the local oscillator frequency. The received signal from a satellite is correlated with a matching pseudorandom code to detect the signal and measure the signal delay and Doppler shift of the signal relative to the corrected local oscillator frequency.

Abstract: Aspects of a method and system for customized full ephemeris compatible with standard AGPS network devices allows a GPS enabled handset to receive real-time full ephemeris from an AGPS server for calculating a position fix. The real-time full ephemeris may be generated at the AGPS server in response to one or more request for real-time full ephemeris from the GPS enabled handset. The AGPS server may be configured to provide fresh full ephemeris generated at smaller intervals such as every 10-15 minutes as approximated real-time full ephemeris. The generated real-time full ephemeris or fresh full ephemeris may be communicated to the GPS enabled handset periodically or aperiodically. Various predicted real-time full ephemeris or predicted fresh full ephemeris compatible with various standards may be generated via Short Term Orbits (STO) technology.

Abstract: A GPS RF front-end is disclosed comprising an antenna for receiving GPS signals, an analog to digital converter for sampling received GPS signals and interface circuitry for outputting the GPS signal samples. The GPS RF front-end is configured to vary the sample resolution of GPS signal samples outputted. Also disclosed is a corresponding method of providing a position fix, storage medium and apparatus for the same.

Abstract: In a method of mitigating errors in satellite navigation measurements at a satellite navigation receiver, respective single-frequency signals are received from respective satellites in a plurality of satellites in a satellite navigation system. Pseudorange and carrier-phase measurements corresponding to respective received single-frequency signals are calculated. These calculations include filtering the pseudorange and carrier-phase measurements in a Kalman filter having a state vector comprising a plurality of states, including a position state, a receiver clock state, and a plurality of bias states. Each bias state corresponds to a respective satellite in the plurality of satellites. The filtering includes updating the state vector. An estimated position of the satellite navigation receiver is updated in accordance with an update to the state vector.

Abstract: Method and apparatus for validating an initial position in a satellite positioning system using range-rate measurements is described. In one example, range-rate measurements are obtained at the remote receiver with respect to a plurality of satellites. Expected range-rates are computed with respect to the plurality of satellites using the initial position. Single differences are computed using the range-rate measurements. Expected single differences are computed using the expected range-rates. Single difference residuals are computed between the single differences and the expected single differences. The single difference residuals are compared to a threshold. The initial position may be deemed valid if the absolute value of each of the single difference residuals is less than or equal to the threshold. A valid initial position may be used to fix the pseudorange integers.

Abstract: An acquisition unit of a GNSS receiver base band circuit includes an integrator with a number of preprocessors where an incoming digital signal is mixed with different frequency signals to compensate at least in part for clock drift and Doppler shifts. The resulting digital signals are, after an accumulation step reducing sample frequency, integrated over an integration period extending over several basic intervals of the length of a basic sequence characteristic for a GNSS satellite, so that samples separated by a multiple of the basic interval are superposed. The resulting data sequence of 1,023 digital values is stored in one of two memories and then, in mixers, sequentially shifted by post-integration frequencies which are multiples of the inverse of the length of the basic interval, The pre-integration frequencies employed in the preprocessors deviate, with one possible exception, from the post-integration frequencies and are usually smaller.

Abstract: A positioning data producing unit can select suitable region position units automatically in accordance with the environmental conditions of the moving target. The location information of a position tracking device is calculated either from a coordinate data of a narrow region and a position data of the narrow region which is selected in accordance with a location of the position tracking device, or from a position data of a broad region, wherein the position data of the narrow region is calculated from a movement parameter of the position tracking device, the position data of the broad region is calculated from a plurality of received satellite signals. The location information is then transmitted via a communication module to a far end receiver.

Abstract: A position determination system of a hybrid method, which is capable of complementing the problems of a position determination method, in which a global positioning system (GPS) is used, and a position determination method, in which a mobile communication signal is used, by combining the above two methods with each other, is provided. Also, it is possible to improve the reliability and the correctness in determining the position of a mobile communication terminal using a dispersing type hybrid position calculation method and a centralized hybrid position calculation method.