| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 342357150 | Satellite selection (i.e., tracking or acquisition) | 59 |
| 20080218411 | Assisted Satellite-Based Positioning - One upper and one lower bound on the search window for the code phase of a signal transmitted from a specific satellite ( | 09-11-2008 |
| 20080246660 | PRESENT POSITION LOCATING METHOD, POSITIONING DEVICE, AND ELECTRONIC INSTRUMENT - Estimation calculations for calculating an estimated present position are performed twice corresponding to each satellite set. The estimated present position calculated by the second estimation calculations is determined to be a present position candidate corresponding to the target satellite set. In the first estimation calculations corresponding to the first satellite set, the calculated satellite position and estimated pseudo-range of each GPS satellite are stored in caches. In the second estimation calculations, the satellite position of each GPS satellite is read from the cache. In the first estimation calculations corresponding to the second or subsequent satellite set, the satellite position and the estimated pseudo-range of each GPS satellite are read from the caches, and the satellite position and the estimated pseudo-range of the GPS satellite of which the satellite position and the estimated pseudo-range have not been stored in the caches are calculated and stored in the caches. In the second estimation calculations, the satellite position of each GPS satellite is read from the cache. | 10-09-2008 |
| 20080246661 | FIRST OUTPUT POSITION CALCULATION METHOD, STORAGE MEDIUM, POSITIONING DEVICE, AND ELECTRONIC INSTRUMENT - In the first positioning, a positioning process that calculates the present position based on acquired GPS satellite signals (step A | 10-09-2008 |
| 20080252520 | POSITIONING DEVICE, ELECTRONIC INSTRUMENT, AND STORAGE MEDIUM STORING PROGRAM - A slice set for a specific period of time is acquired from a storage area of a memory which is a ring buffer while changing the read position, and the signal strength total value of each slice set is calculated. The signal strengths of the slices included in the maximum strength slice set and the signal strengths of the slices preceding or subsequent to the maximum strength slice set are calculated, and the final signal read position is determined based on a read offset of the maximum strength slice. A GPS satellite signal is acquired and tracked based on the slice read from the determined signal read position, and a specific positioning process is performed. | 10-16-2008 |
| 20080291085 | TERMINAL DEVICE, METHOD OF CONTROLLING TERMINAL DEVICE, AND RECORDING MEDIUM - A terminal device searches for a satellite signal by performing a correlation process over a predetermined first accumulation time within a predetermined frequency range in units of search frequencies at specific intervals. When the terminal device has failed in searching for the satellite signal, the terminal device searches for the satellite signal by performing the correlation process over a predetermined second accumulation time longer than the first accumulation time at the search frequency and frequencies differing from the search frequency by a specific frequency which is less than the interval of the search frequencies and specified based on a drift of a reference oscillator of the terminal device within the second accumulation time. The terminal device determines a search result of the satellite signal based on a search result at the search frequency and search results at the frequencies differing from the search frequency by the specific frequency. | 11-27-2008 |
| 20080309552 | SYSTEM AND METHOD FOR GPS ACQUISITION USING ADVANCED TIGHT COUPLING - A system and method for GPS acquisition in relatively high interference is described. Acquisition is aided by an Advanced Tightly Coupled (ATC) tracking filters that compute a satellite range residuals and range rate residuals for satellites being acquired. Multiple channels are used in parallel to search for the desired satellites. Range residuals from the ATC filters are used to correct the computed receiver offset and thus allow acquisition in the presence of relatively high interference. | 12-18-2008 |
| 20080309553 | Systems and Methods for Mitigating Multipath Signals - Systems and methods for mitigating multipath signals in a receiver are provided. In this regard, a representative system, among others, includes a receiver comprising an antenna being configured to receive signals from a plurality of satellites, and a computing device being configured to: generate pseudorange measurements based on the received satellites signals, process the generated pseudorange measurements to reduce its pseudorange residuals based on statistical modeling in order to mitigate multipath errors, and compute navigation solutions based on the processed pseudorange measurements. A representative method, among others, for mitigating multipath signals in a receiver, comprises: receiving the pseudorange measurements; processing the received pseudorange measurements to reduce its pseudorange residuals based on statistical modeling in order to mitigate multipath errors; and computing navigation solutions based on the processed pseudorange measurements. | 12-18-2008 |
| 20090002233 | METHODS AND APPARATUSES FOR SEARCHING FOR SATELLITE SIGNALS - Methods and apparatuses for searching for satellite signals are provided. One of the proposed methods of searching for satellite signals includes: searching for satellite signals according to measurement predictions; searching for satellite signals of a reference satellite without referring to the measurement predictions; determining if measurements derived from the reference satellite are consistent with the measurement predictions; and searching for satellite signals of other satellites without referring to the measurement predictions if the measurements derived from the reference satellite are determined to be inconsistent with the measurement predictions. If the measurements derived from the reference satellite are determined to be inconsistent with the measurement predictions, navigation information for use in the generation of the measurement predictions is determined to be stale. | 01-01-2009 |
| 20090002234 | Spread Spectrum Software Receiver - A spread spectrum signal receiver comprises a radio signal processing unit, at least partly implemented in software running on a processor. The processing unit determines a candidate collection of subsets of signal sources from a group of potential sources, by the criterion that an anticipated processing intensity required to derive position/time related data from that subset is equal to or less than a maximum specified processing intensity. Each subset contains at least a minimum number of signal sources necessary to produce position/time related data. The processing unit also selects a set of preferred signal sources from a candidate subset, based on a highest estimated quality of the position/time related data attainable during a subsequent operating period for the receiver without exceeding the maximum specified processing intensity. During the subsequent operating period, the receiver receives spread spectrum signals from the selected set of signal sources and produces position/time related data therefrom. | 01-01-2009 |
| 20090009389 | Locating satellites - A system and method of locating the position of a satellite or a user using a satellite positioning system. The system and method includes receiving, at a terminal, satellite positioning data for at least one specified time period over a communications channel. In addition, the system includes storing, at the terminal, the satellite positioning data for the at least one specified time period. Responsive to an event at a later time, the system generally calculates, at the terminal, the satellite position at the later time based only on the satellite positioning data for the at least one specified time period. | 01-08-2009 |
| 20090015471 | POSITIONING SYSTEM, IC CHIP FOR POSITIONING, POSITIONING METHOD, AND POSITIONING PROGRAM - A positioning system accurately estimates transmission times of signals from a signal transmitter and measures a position of a receiver on the basis of the transmission times. The receiver | 01-15-2009 |
| 20090040104 | PRESENT POSITION LOCATING METHOD - 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=k | 02-12-2009 |
| 20090079630 | Time Adjustment Device, Timepiece with a Time Adjustment Device, and a Time Adjustment Method - A time adjustment device has a reception unit that receives a satellite signal transmitted from a positioning information satellite, a time information generating unit that generates internal time information, and a time information adjustment unit that adjusts the internal time information. The satellite signal contains satellite time information that is kept by the positioning information satellite. The reception unit includes a signal level acquisition unit that searches for positioning information satellites and acquires the signal level of the satellite signal transmitted from each positioning information satellite, a reception satellite selection unit that selects a positioning information satellite based on the acquired signal level, and a satellite time information acquisition unit that receives the satellite signal transmitted from the positioning information satellite selected by the reception satellite selection unit, and acquires the satellite time information contained in the satellite signal. The time information adjustment unit adjusts the internal time information based on the acquired satellite time information when the satellite time information acquisition unit has acquired the satellite time information. | 03-26-2009 |
| 20090115660 | DETERMINING POSITION WITHOUT USE OF BROADCAST EPHEMERIS INFORMATION - Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods. A server or client device receives or collects historical state data of satellites of a satellite-based positioning system and generates predictions of future satellite trajectories for future time periods. When a server generates the predictions, the predictions are subsequently transferred to a client device. The client device selects predictions appropriate to time of interest. The time can be any time during a period of at least seven calendar days. The client device reconstructs satellite states using information on the predictions and uses the reconstructed satellite states to acquire satellite signals as appropriate to the current location and time of the client device. The client device determines and/or tracks its position using information of the satellite states and timing information of the satellite signals. | 05-07-2009 |
| 20090128409 | METHOD AND APPARATUS FOR MONITORING THE INTEGRITY OF SATELLITE NAVIGATION SIGNALS - A method for monitoring the integrity of satellite navigation system includes a first detection of integrity problems, in which the same entity of a navigation signal from a particular satellite is received at different sites, and evaluated to estimate the error of the entity and the error made during the error estimation process. In a second detection, navigation signals received from a specific satellite are measured and evaluated to estimate the error of the entity and the error in the error estimation process. Finally, in a third detection, several navigation signals from different satellites are measured, and evaluated to estimate the error of the entity and the error made in the error estimation process. Integrity problems which are detectable in the first and second detections are taken into account only if it is probable that they occur during the third detection, and have not been discovered during the first and second detection | 05-21-2009 |
| 20090135061 | METHOD AND DEVICE FOR PREDICTING GNSS SATELLITE TRAJECTORY EXTENSION DATA USED IN MOBILE APPARATUS - A method and device for predicting satellite trajectory extension data used in a mobile apparatus. The device in accordance with the present invention comprises an I/O interface and a microprocessor. The input/output (I/O) interface is used for obtaining at least one satellite navigation message for a satellite. The microprocessor is used for determining a propagating condition according to the satellite navigation message, estimating a plurality of parameters of a satellite trajectory prediction model according to the propagating condition, and propagating a set of satellite trajectory extension data by using the satellite trajectory prediction model. | 05-28-2009 |
| 20090135062 | NAVIGATION APPARATUS AND NAVIGATION-RELATED INFORMATION DISPLAY METHOD - A navigation apparatus and a navigation-related information display method acquire a plurality of orbit data from a plurality of GPS satellites, pinpoint the current geographical position of the apparatus according to the orbit data and distance data on the distances from the plurality of GPS satellites, display the acquiring progress level until completely acquiring a plurality of orbit data sufficient for pinpointing the current geographical position, count the remaining effective time of the plurality of orbit data acceptable for pinpointing the current geographical position and display the remaining effective time by means of a level mark that is provided with a gradation. | 05-28-2009 |
| 20090135063 | SATELLITE SEARCH METHOD AND RECEIVER USING THE SAME - A satellite time dynamic search method and a receiver implementing such a method are disclosed. In the present invention, a predetermined period of time is sampled into multiple time samples. The time samples are sieved according to a search result of a satellite selected from candidate satellites each time. By repeatedly doing so, the finally remaining time sample will approach a true satellite system time, and accordingly the candidate satellites converge to the most possible ones as to facilitate satellite search. | 05-28-2009 |
| 20090189811 | GPS PRE-ACQUISITION FOR GEOTAGGING DIGITAL PHOTOS - A handheld electronic device, such as a GPS-enabled wireless communications device with an embedded camera, a GPS-enabled camera-phone or a GPS-enabled digital camera, determines whether ephemeris data needs to be obtained for geotagging digital photos taken with the device. By monitoring user activity with respect to the camera, such as activation of the camera, the device can begin pre-acquisition of a GPS position fix by obtaining needed ephemeris data before the photograph is actually taken. This GPS pre-acquisition improves the likelihood that a position fix (GPS lock) is achieved by the time the photo is taken (to enable immediate geotagging). Alternatively, the photo can be geotagged retroactively by appending the current location to the metadata tag associated with the digital photo. An optional acquisition status indicator can be displayed on a user interface of the device to indicate that a position fix is being obtained. | 07-30-2009 |
| 20090195451 | Method For Transmitting Satellite Data - In a method for transmitting satellite data of a global navigation satellite system each satellite transmit position data of neighboring satellites to a navigation device on the earth. The subset of neighboring satellites with respect to a specific satellite is determined by averaging over a period of the inter-satellite distance. The subsets are further restricted to the condition that all visible satellites are referenced by the position data of at least one other satellite. This requirement can be met by choosing appropriate permutations among the satellites with shortest distance. | 08-06-2009 |
| 20090195452 | TERMINAL APPARATUS, POSITIONING METHOD, CONTROL PROGRAM FOR TERMINAL APPARATUS, AND COMPUTER READABLE RECORDING MEDIUM HAVING RECORDED THEREIN CONTROL PROGRAM FOR TERMINAL APPARATUS - A terminal apparatus includes a control unit and a positioning device. The control unit determines a first satellite-to-be-acquired from among a plurality of SPS satellites, and generates an initial search frequency for the first satellite-to-be-acquired. The positioning device has a plurality of search units, and is configured to acquire the first satellite-to-be-acquired using the plurality of search units. The control unit determines first difference information, which is a difference between the initial search frequency and the frequency at which the first satellite-to-be-acquired is acquired. The control unit generates corrected search frequencies for other SPS satellites, using the first difference information. The positioning device acquires other necessary SPS satellites using the corresponding corrected search frequencies. The terminal apparatus can acquire SPS satellites accurately even when there has been a frequency shift in the terminal apparatus since the last positioning. | 08-06-2009 |
| 20090207076 | SYSTEM AND METHOD FOR GNSS POSITION AIDED SIGNAL ACQUISITION - A Global Navigation Satellite System (GNSS) device, such as the Global Positioning System (GPS) device, uses satellite orbital position information from almanac and/or ephemeris data to change a search parameter, such as reducing the number of analyzed frequency bins or setting signal strength threshold, so that satellite signal acquisition times are reduced. An exemplary embodiment estimates an orbital position for at least one GNSS satellite based upon at least one of almanac data and ephemeris data, detects a signal emitted from the at least one GNSS satellite, and based upon the estimated orbital position information for the at least one GNSS satellite that is determined from the almanac data and the ephemeris data, adjusts at least one parameter used in the analysis of the detected signal. | 08-20-2009 |
| 20090219206 | EPHEMERIS EXTENSION METHOD FOR GNSS APPLICATIONS - Systems, methods and devices for improving the performance of Global Navigation Satellite System (GNSS) receivers are disclosed. In particular, the improvement of the ability to calculate a satellite position or a receiver position where a receiver has degraded ability to receive broadcast ephemeris data directly from a GNSS satellite is disclosed. Correction terms can be applied to an approximate long-term satellite position model such as the broadcast almanac. | 09-03-2009 |
| 20090231192 | METHOD AND SYSTEM FOR GENERATING TEMPORARY EPHEMERIS - Aspects of a method and system for generating temporary ephemeris may include determining one or more positions of a satellite receiver based on a plurality of satellite signals received from a plurality of satellites for which complete ephemeris data has been received at the satellite receiver. Temporary ephemeris data may be generated from the determined one or more positions of the satellite receiver and one or more satellite signals from one or more satellites with incomplete ephemeris data. One or more estimated positions of the satellite receiver may be determined based on the generated temporary ephemeris and a second plurality of satellite signals, wherein at least one of the second plurality of satellite signals is associated with the one or more satellites with incomplete ephemeris data. The temporary ephemeris data may be generated by generating a translated satellite position and a rate of change of an associated receiver clock corrected pseudorange. | 09-17-2009 |
| 20090231193 | TRACKING SATELLITE SIGNAL - Techniques, systems and apparatus are described for tracking a satellite signal. In one aspect, an apparatus includes a tracking module to generate a satellite-based measurement result by tracking a satellite signal received from a satellite. The tracking module includes sub-tracking modules with each sub-tracking module configured to generate the satellite-based measurement result by using a different integral time. | 09-17-2009 |
| 20090237302 | AUTONOMOUS ORBIT PROPAGATION SYSTEM AND METHOD - A method of predicting a location of a satellite is provided wherein the GPS device, based on previously received information about the position of a satellite, such as an ephemeris, generates a correction acceleration of the satellite that can be used to predict the position of the satellite outside of the time frame in which the previously received information was valid. The calculations can be performed entirely on the GPS device, and do not require assistance from a server. However, if assistance from a server is available to the GPS device, the assistance information can be used to increase the accuracy of the predicted position. | 09-24-2009 |
| 20090243929 | METHOD AND APPARATUS FOR FASTER GLOBAL POSITIONING SYSTEM (GPS) LOCATION USING A PRE-COMPUTED SPATIAL LOCATION FOR TRACKING GPS SATELLITES - A method and apparatus for faster global positioning system (GPS) location using pre-computed spatial location data are described. In one embodiment, a method includes acquiring a pre-computed spatial location of a mobile platform device (MPD) that is computed when a GPS receiver is disabled due to the spatial location of the MPD. In one embodiment, the pre-computed spatial location is determined by a non-GPS based spatial location technology when a receiver is disabled due to the spatial location of the MPD. During the periodic computation of spatial location data, the GPS receiver may be monitored. In one embodiment, in response to activation of the GPS receiver, the pre-computed spatial location data is provided to the GPS receiver for identification and lock onto a predetermined number of visible satellites to reduce a time to first fix (TTFF) a current spatial location of the MPD. Other embodiments are described and claimed. | 10-01-2009 |
| 20090278741 | NAVIGATION APPARATUS AND METHOD OF ACQUIRING EPHEMERIS DATA - A navigation apparatus includes: an acquisition unit for receiving a satellite signal from satellites and demodulates the satellite signal to acquire ephemeris data; a storing unit for storing the ephemeris data; a time measuring unit for measuring a valid time of the ephemeris data from timing of acquisition of the ephemeris data; and a control unit for making the acquisition unit reacquire new ephemeris data before the valid time of the ephemeris data elapses in the time measuring unit. | 11-12-2009 |
| 20090289849 | METHOD AND APPARATUS FOR SATELLITE POSITIONING SYSTEM TIME RESOLUTION - A method and apparatus that reduces the number of possible time alignment possibilities to simplify the satellite positioning system time-ambiguity resolution problem is disclosed. The method may include receiving a first signal ( | 11-26-2009 |
| 20090295634 | Global positioning system receiver - A GPS receiver includes a demodulator for obtaining ephemeris data and almanac data from a navigation message sent by satellites, and includes a calculator. The calculator is used for calculating almanac correction parameters according to coordinate differences between ephemeris-based coordinates of the satellites and almanac-based coordinates of the satellites. The GPS receiver also includes a satellite position calculator for calculating the ephemeris-based coordinates of the satellites according to the ephemeris data, for calculating the almanac-based coordinates of the satellites according to the almanac data, and for calculating positions of the satellites according to the ephemeris data, the almanac data and the almanac correction parameters. | 12-03-2009 |
| 20090309794 | METHOD AND APPARATUS FOR ENHANCED AUTONOMOUS GPS - Method and apparatus for locating position of a remote receiver is described. In one example, long term satellite tracking data is obtained at a remote receiver. Satellite positioning system (SPS) satellites are detected. Pseudoranges are determined from the remote receiver to the detected SPS satellites. Position of the remote receiver is computed using the pseudoranges and the long term satellite tracking data. SPS satellites may be detected using at least one of acquisition assistance data computed using a previously computed position and a blind search. Use of long term satellite tracking data obviates the need for the remote receiver to decode ephemeris from the satellites. In addition, position of the remote receiver is computed without obtaining an initial position estimate from a server or network. | 12-17-2009 |
| 20090315772 | METHOD AND APPARATUS FOR POSITION DETERMINATION WITH EXTENDED SPS ORBIT INFORMATION - A method and system for assisting mobile stations to locate a satellite use an efficient messaging format. A server computes a correction between coarse orbit data of a satellite and precise orbit data of the satellite. A coordinate system is chosen such that variation of the correction is substantially smooth over time. The server further approximates the correction with mathematical functions to reduce the number of bits necessary for transmission to a mobile station. The mobile station, upon receiving the coefficients, evaluates the mathematical functions using the coefficients and a time of applicability (e.g., the current time), converts the evaluated result to a standard coordinate system, and applies the conversion result to the coarse orbit data to obtain the precise orbit data. | 12-24-2009 |
| 20090315773 | METHOD FOR PROVIDING SATELLITE ORBIT EPHEMERIS, SERVER, AND POSITIONING SYSTEM - A method for providing satellite orbit ephemeris includes: determining a positioning satellite in view of a reference position; and providing to a positioning device a satellite orbit ephemeris of the positioning satellite in view of the reference position, the satellite orbit ephemeris being valid for at least one day. | 12-24-2009 |
| 20090322607 | POSITIONING METHOD - A reception environment is determined to be a multipath environment when the difference (positioning altitude difference) between the maximum value (maximum altitude) and the minimum value (minimum altitude) of the altitudes of candidate present positions P of respective satellite sets exceeds a given threshold value (e.g., 200 m), and is determined to be an open-sky environment when the positioning altitude difference is equal to or less than the given threshold value. When the reception environment is the open-sky environment, an evaluation point E of each satellite set is calculated using a known evaluation method based on the number of satellites, a PDOP value, and the like. When the reception environment is the multipath environment, the evaluation point E of each satellite set is calculated in the same manner as in the open-sky environment, and a change amount ΔE corresponding to the difference (altitude difference) between the altitude corresponding to the preceding located position acquired from an altitude table and the altitude of the candidate present position of the target satellite set is subtracted from the evaluation point E. | 12-31-2009 |
| 20100007556 | COLD START SATELLITE SEARCH METHOD - A method for searching satellites in a cold start state. The method of the present invention, a first satellite, which is predetermined or randomly selected, is searched. Then, a second satellite to be searched is selected according to the searching result (hit or missed) for the first satellite and respective interrelationships between the first satellite and the other satellites. In practice, an initial weight factor table is provided. Depending on the searching result, the initial weight factor table is updated according to the interrelationships between the satellites during searching. By using the method of the present invention, the time-to-first-fix (TTFF) can be reduced to a shorter period of time so as to provide a rapid cold start satellite positioning. | 01-14-2010 |
| 20100007557 | FIRST OUTPUT POSITION CALCULATION METHOD, STORAGE MEDIUM, POSITIONING DEVICE, AND ELECTRONIC INSTRUMENT - In the first positioning, a positioning process that calculates the present position based on acquired GPS satellite signals (step A | 01-14-2010 |
| 20100013706 | DIGITAL FRONT END FOR A SATELLITE NAVIGATION RECEIVER - A satellite navigation receiver having a digital front end. The satellite navigation receiver includes an analog section for receiving, amplifying, and filtering a satellite navigation signal. The digital front end is coupled to the analog section and is used to perform digital signal processing on the satellite navigation signal before it is passed on to the acquisition and tracking engines. By off-loading some of the functionality from the analog section to the digital front end, the analog section may be made smaller and cheaper and may consume less power. Moreover, additional functionalities can be added to the digital front end to improve performance. Since the digital front end is comprised of digital circuitry, it scales down in size, cost, and power with advances in semiconductor fabrication techniques. | 01-21-2010 |
| 20100045526 | METHOD FOR ACQUIRING SIGNAL OF SATELLITE - Disclosed is a method for acquiring a signal of a satellite by a receiver, including pre-storing weighting factors of satellites, which include possibility indexes of satellite signal acquisition with respect to positions and times of the receiver, receiving a request for acquisition of the satellite and initializing operational status information and search history information of the satellites, searching for the satellites in sequence according to the weighting factors, resetting the operational status information and search history information of the satellites based on whether signals of the satellites are detected, updating the weighting factor of a satellite having a signal that has been detected, and selecting the satellite having the signal that has been detected in consideration of the updated weighting factor, and acquiring the signal from the selected satellite. | 02-25-2010 |
| 20100045527 | METHOD AND APPARATUS FOR COLLECTING SUBFRAMES OF SATELLITE NAVIGATION DATA - A method and apparatus for collecting subframes of navigation data of satellites are disclosed. In the method of the present invention, the subframe is divided into several sub-units, each sub-units includes one or more words. When a receiver receives a subframe with a subframe ID, the respective required sub-units of the subframe are checked. A dummy sub-unit is not necessary to be considered. Valid ones of the required sub-units are collected. If not all the required sub-units of the subframe have been collected, the absent sub-units are to be collected when the next subframe with the same subframe ID is received. Some protection schemes can be applied to raise the reliability of such sub-unit collection. Especially when the signal is weak or unstable, the present invention may significantly improve the TTFF (Time To First Fix) performance of the receiver. | 02-25-2010 |
| 20100060519 | PARAMETER CALCULATING METHOD, LONG-TERM PREDICTION ORBIT DATA PROVIDING METHOD, INFORMATION PROVIDING DEVICE, AND POSITIONING SYSTEM - A parameter calculating method includes: setting lengths of prediction target terms as divisions of a predetermined effective period of a satellite orbit as variable lengths; and calculating a parameter of a predetermined orbit model expression used for approximating the satellite orbit based on prediction position data containing prediction positions of a positioning satellite in time series for each of the prediction target terms. | 03-11-2010 |
| 20100085253 | Continuous Tracking Counter for Enabling Cycle-slip Free Messages in a Network of Global Navigation System Satellite Receivers - A method of communicating satellite tracking information among a network of global navigation satellite system receivers is described. The method includes determining at a first GNSS receiver which satellites in a constellation of satellites have been continuously tracked over a preceding selected time period, and for each such satellite determining its elevation with respect to the zenith. Only the elevation value for the lowest satellite in the set of satellites for which all satellites of higher elevation values have been continuously tracked over the selected time period is then transmitted to the second GNSS receiver. That receiver can then reconstruct the set of satellites which have been continuously tracked. | 04-08-2010 |
| 20100090895 | ASSISTED SATELLITE SIGNAL BASED POSITIONING - For assisting a satellite based positioning, parameters are received for at least one satellite. Redundant information is removed from these parameters at large. Parameters with reduced redundancy are then provided as assistance data for the satellite signal based positioning. Such parameters with reduced redundancy can be received on the other hand as assistance data for a satellite signal based positioning. The original parameters are then reconstructed by adding the removed redundant information to the received parameters. The reconstructed original parameters are used in an assisted satellite signal based positioning. | 04-15-2010 |
| 20100090896 | DISTRIBUTED ORBIT MODELING AND PROPAGATION METHOD FOR A PREDICTED AND REAL-TIME ASSISTED GPS SYSTEM - A distributed orbit and propagation method for use in a predicted GPS or GNSS system, which includes a predicted GPS server (PGPS Server), a source of high accuracy orbit predictions (Orbit Server), a global reference network (GRN Server) providing real-time GPS or GNSS assistance data to the PGPS Server, a predicted GPS client (PGPS Client) running on a device equipped with a GPS or AGPS chipset. In response to requests from the PGPS Client, the PGPS Server produces and disseminates an initial seed dataset consisting of current satellite orbit state vectors and orbit propagation model coefficients. This seed dataset enables the PGPS Client to locally predict and propagate satellite orbits to a desired future time. This predictive assistance in turn helps accelerate Time To First Fix (TTFF), optimize position solution calculations and improve the sensitivity of the GPS chip present on, or coupled with, the device. In contrast with other conventional predicted GPS systems that forward large volumes of predicted orbits, synthetic ephemeris or synthetic almanac data, this method optimally reduces data transfer requirements to the client, and enables the client to locally synthesize its own predicted assistance data as needed. This method also supports seamless notification of real-time satellite integrity events and seamless integration of predicted assistance data with industry standard real-time assistance data. | 04-15-2010 |
| 20100103041 | 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, includes: determining the reliability of long-term predicted orbit data, which is acquired by predicting a satellite orbit in a target period of at least one day, using predicted position data including predicted positions of a positioning satellite in time series and actual position data including actual positions of the positioning satellite corresponding to the predicted positions. | 04-29-2010 |
| 20100117900 | METHOD AND SYSTEM FOR MAINTAINING A GNSS RECEIVER IN A HOT-START STATE - Aspects of a method and system for maintaining a GNSS receiver in a hot-start state are provided. A GNSS receiver in a standby mode may transition from a sleep state to a wakeup state to acquire ephemeris from, for example, GPS signals, GALILEO signals, and/or GLONASS signals. The acquired ephemeris may be stored and utilized for the GNSS receiver to generate a navigation solution in a normal mode. The GNSS receiver may transition from the normal mode to the sleep state or the wakeup state in standby mode. A sleep period and a wakeup period for the full sleep-wakeup cycle in the standby mode may be predetermined or dynamically adjusted based on required QoS, quality of satellite signals, and/or user inputs. The sleep period and the wakeup period may be selected in a way to ensure a valid and complete ephemeris to be acquired. | 05-13-2010 |
| 20100117901 | POSITION CALCULATING METHOD AND POSITION CALCULATING DEVICE - A position calculating method includes: determining a positioning satellite used for position calculation on the basis of at least reliability of satellite orbits in a prediction target period corresponding to a position calculation point, the reliability of satellite orbits being set in long-term predicted orbit data in which satellite orbits of positioning satellites and reliability of the satellite orbits are associated for each prediction target period; and calculating a position on the basis of a positioning signal received from the determined positioning satellite. | 05-13-2010 |
| 20100127928 | SYSTEM AND METHOD FOR SERVER SIDE DETECTION OF FALSIFIED SATELLITE MEASUREMENTS - A system and method for determining whether a wireless device has transmitted one or more forged satellite measurements. An estimated location of the wireless device may be determined as a function of information from a cellular network. Acquisition assistance data may be determined for a first set of satellites as a function of the estimated location, the assistance data including an uncertainty window. If measured code phase information in the satellite measurements substantially correlates to the uncertainty window, then the wireless device may be transmitting forged satellite measurements. | 05-27-2010 |
| 20100127929 | POSITION CALCULATING METHOD AND POSITION CALCULATING DEVICE - A position calculating method includes: determining whether satellite orbit data of a positioning satellite having a first effective term and long-term prediction orbit data having a second effective term longer than the first effective term and predicting a satellite orbit of the positioning satellite are retained or not; and calculating a position by using the satellite orbit data when it is determined that the satellite orbit data and the long-term prediction orbit data are retained. | 05-27-2010 |
| 20100141521 | METHOD OF MANAGING ADDITIONAL FILTERS IN A SATELLITE NAVIGATION SYSTEM - Method of managing additional filters in a navigation system fitted in a vehicle ( | 06-10-2010 |
| 20100141522 | METHOD AND APPARATUS FOR REDUCING TIME TO FIRST FIX (TTFF) OF GNSS RECEIVER WITHOUT ACCURATE TIME INFORMATION - 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. | 06-10-2010 |
| 20100141523 | SATELLITE POSITIONING SYSTEM SIGNAL SEARCHING METHODS AND APPARATUSES - Methods and apparatuses are provided which may be enabled within and/or for use with a Satellite Positioning System (SPS) receiver and/or other like apparatuses or device(s) to perform a rapid search startup process. | 06-10-2010 |
| 20100141524 | TERMINAL DEVICE, POSITIONING METHOD, AND RECORDING MEDIUM - A terminal device includes a plurality of search channel sections which search for a positioning satellite, a candidate reception frequency calculation section which calculates a candidate reception frequency of a first acquisition target satellite by causing the search channel sections to perform the correlation accumulation process for a first accumulation time, a candidate frequency confirmation section which confirms reliability of the candidate reception frequency by causing the search channel sections to perform the correlation accumulation process for a second accumulation time longer than the first accumulation time, a final frequency calculation section which calculates a final frequency by causing the search channel sections to perform the correlation accumulation process for a third accumulation time longer than the second accumulation time, and a first difference calculation section which calculates a difference between an estimated synchronization frequency corresponding to each first acquisition target satellite and the final frequency. | 06-10-2010 |
| 20100141525 | POSITIONING DEVICE, ELECTRONIC INSTRUMENT, AND STORAGE MEDIUM STORING PROGRAM - A slice set for a specific period of time is acquired from a storage area of a memory which is a ring buffer while changing the read position, and the signal strength total value of each slice set is calculated. The signal strengths of the slices included in the maximum strength slice set and the signal strengths of the slices preceding or subsequent to the maximum strength slice set are calculated, and the final signal read position is determined based on a read offset of the maximum strength slice. A GPS satellite signal is acquired and tracked based on the slice read from the determined signal read position, and a specific positioning process is performed. | 06-10-2010 |
| 20100149037 | Global positioning system (GPS) receiver and method of determining location of GPS receiver - A Global Positioning System (GPS) receiver includes a GPS receiving unit configured to receive navigation data from at least one visible satellite, a decoder configured to decode the received navigation data to extract time and almanac information from the decoded navigation data and a database configured to store satellite disposition information. A satellite location determining unit is configured to select at least one visible satellite candidate using the time information and the satellite disposition information, and to determine locations-in-space of the at least one visible satellite candidate with the almanac information. Also, a navigation filter is configured to calculate pseudo-ranges from the at least one visible satellite and the selected at least one visible satellite candidate using the corresponding locations-in-space, and to determine a location of the GPS receiver using the calculated pseudo-ranges. | 06-17-2010 |
| 20100156720 | Method and Apparatus for Optimizing the Accuracy of Position Determination and Reducing the Integrity Risk of a Receiver in a Global Satellite Navigation System - In a method for optimizing the accuracy of position determination, and/or for reducing the integrity risk, of a receiver in a global satellite navigation system having a plurality of satellites, for at least one satellite that is visible to the receiver (E), a deviation error (AF) is determined which is a function of the geometric orientation of the satellite relative to the receiver, and of at least one system parameter. The deviation error is determined based on an additional deviation error generated by an error projection into a coordinate system of the receiver. A first or a second value, whichever is smaller of the two, is used as the deviation error. The first value for the at least one system parameter is determined using a respective specified parameter value. The second value is determined for the at least one system parameter, using a modified parameter value which is modified with respect to the specified parameter value in such a way that a lower error in the modified parameter value of the at least one system parameter is accepted as true. | 06-24-2010 |
| 20100164798 | INTER-CHANNEL BIAS CALIBRATION FOR NAVIGATION SATELLITE SYSTEMS - Dynamic inter-channel bias calibration of a navigational receiver is provided. A reference signal is propagated through front end circuitry of the receiver. A delay caused by the propagation of the reference signal through the front end circuitry is measured. The inter-channel bias of the navigational receiver is reduced using the measured delay associated with the front end circuitry of the receiver. | 07-01-2010 |
| 20100164799 | ELECTRONIC DEVICE AND METHOD FOR SEARCHING SATELLITES - A method for searching satellites includes obtaining a position information, obtaining a time information, calculating a regional range according to the position information, finding out numbers of target satellites corresponding to the time information and within the regional range from ephemeris data in an ephemeris database, searching the target satellites corresponding to the numbers, and receiving the satellite signals from each searched target satellite. In an electronic device capable of searching satellites, an operation interface is used to output the position information, and a calculation unit is used to calculate the regional range according to the received position information. A look-up unit is electrically connected to the ephemeris database, and used to find out the numbers of the target satellites corresponding to time information and within the regional range from the ephemeris data. | 07-01-2010 |
| 20100164800 | SATELLITE ORBIT DATA COMPRESSING METHOD, SATELLITE ORBIT DATA PROVIDING METHOD, SATELLITE ORBIT DATA DECOMPRESSING METHOD, AND DATA COMPRESSING DEVICE - A satellite orbit data compressing method includes: determining a compression method of a parameter value on the basis of a variation tendency of the parameter value in an orbit model approximating a satellite orbit; and calculating a compressed parameter value by reducing a bit sequence representing the parameter value using the determined compression method. | 07-01-2010 |
| 20100207815 | Handheld Electronic Apparatus and Method Thereof - A handheld electronic apparatus includes a positioning module, a sensing module, a constellation database, and a processing module. The positioning module generates location information associated with the handheld electronic apparatus according to a satellite signal received by the handheld electronic apparatus. The sensing module detects a vertical tilted angle and a horizontal observing direction associated with a positioned state of the handheld electronic apparatus. The processing module retrieves corresponding real-time constellation information from constellation data stored in the constellation database according to timing information, the location information, the vertical tilted angle, and the horizontal observing direction. | 08-19-2010 |
