Abstract:
A cinematic parameter computing method of a satellite navigation system, including: receiving signals at a receiving apparatus from a plurality of satellites; processing said signals to provide received data; computing a first cinematic parameter value of said receiving apparatus according to a first computational method using said received data; computing a second cinematic parameter value of said receiving apparatus according to a second computational method using said received data and computing a distance value representing a difference between said first and second cinematic parameter values. The distance value is compared with a reference value providing a comparison result data and selecting one of first and second computational methods based on said comparison result data.
Abstract:
Disclosed herein is a radiodetermination technology, a radiodetermination device according to one embodiment of the disclosure comprising a positioning mode determination part and position Information generating part, thereby enhancing accuracy and speed of positioning in a resource-limited mobile terminal environment and also further improving energy efficiency and user conveniences.
Abstract:
Raw measurements for a plurality of GNSS satellites are pruned based on signal to noise ratio (SNR) and elevation; with remaining unpruned raw measurements sorted by SNR into a sorted list of raw measurements. A first dilution of precision (DOP) based selecting process is performed to select an initial candidate list of raw measurements. The first DOP selecting process begins by using at least those of said pruned list of raw measurements which exceed an SNR quality threshold. The initial candidate list of raw measurements is sorted by elevation angle. A second DOP selecting process is performed to select a final candidate list of raw measurements. The second DOP selecting process begins by using at least those of the sorted initial candidate list which an elevation quality threshold. The final candidate list is used in position computation for a present epoch.
Abstract:
Embodiments provided herein recite methods and systems for position determination based on hybrid pseudorange solution data. In one embodiment, navigation satellite system (NSS) pseudorange data is received for high yield pseudoranges. In addition, NSS pseudorange data is received for high accuracy pseudoranges. The high accuracy pseudoranges and selected ones of the high yield pseudoranges utilized by a hybrid PVT processor to determine a hybrid NSS-based location solution.
Abstract:
An apparatus corrects a position coordinate measured by a GPS receiver. Road data representing a position coordinate of a constructed road is included. Locus data representing a plurality of position coordinates of the GPS receiver during a past specified period is generated based on a position coordinate acquired. A road section traveled by the GPS receiver during the past specified period is estimated based on road data stored and a position coordinate acquired. A bias error of a position coordinate measured by the GPS receiver is estimated based on position coordinates at a plurality of points in a road section estimated and position coordinates at a plurality of points represented by the locus data. A position coordinate measured by the GPS receiver is corrected based on a bias error estimated and outputted.
Abstract:
A system is disclosed that uses GPS and additional data to determine the location of an object. Typically, GPS receivers need valid data from four satellites to accurately determine a three dimensional location. If a GPS receiver is receiving valid data from fewer than four satellites, then additional data is used to compensate for the shortage of satellites in view of the GPS receiver. Examples of additional data includes a representation of the surface that the object is traveling on, an accurate clock, an odometer, dead reckoning information, pseudolite information, and error correction information from a differential reference receiver. An exemplar use of the disclosed system is to concurrently track a set of one or more automobiles during a race. The determined locations of the automobile can be used to provide route information, to generate statistics and/or to edit video of one or more of the automobiles.
Abstract:
A GPS utilizing redundant GPS receivers having position and time mark outputs connected directly to a processing block so that the time marks from both GPS receivers are received by the processing block and, in the event a first of the GPS receivers output becomes unusable and the system uses a second of the redundant GPS receivers while periodically checking the first for reusability, no time will be lost in the validation of the new channel.
Abstract:
A method for operating a GNSS sensor of a vehicle having control operations influenceable via an electronic control unit includes receiving satellite data, evaluating the satellite data, and deactivating at least one operating mode of the GNSS sensor when at least a portion of the satellite data is unsuitable for determining the position of the vehicle.
Abstract:
In one embodiment, the present invention includes a method of receiving and decoding military L2 or L1 P(Y) or M-Code signals and re-transmitting these in real-time as legacy L1-C/A signals. The decoding process of the P(Y) or M-code is done through the programming by the user of secret keys into an embodiment of this invention. These military code signals are then decoded into standard PVT/PNT information which are typically transmitted on an industry standard serial port and format, which are then re-encoded using a real-time GPS simulator sub-system as legacy L1-C/A code signals, and transmitted to the output of the embodiment of this invention as a standard antenna signal. This output signal could be made compatible with any commercial L1-C/A code GPS receiver, and may thus be decoded by the GPS receiver as if the signals had been received directly from the Satellites. In one application of this embodiment of this present invention the legacy GPS receiver does not know the difference and cannot differentiate between signals generated by this embodiment of the present invention versus true GPS satellite signals received by a real GPS antenna. This embodiment of the present invention allows efficient replacement of legacy GPS antennae without having to change any of the system, setup, cabling, or programming of the legacy GPS receiver system. Another embodiment of this present invention may receive Glonass, BeiDou, or Galileo signals, and output legacy GPS signals to allow a glueless retrofit of legacy GPS receivers to Glonass, BeiDou, or Galileo compatibility.
Abstract:
A method for determining positions of a mobile system is disclosed. The method involves receiving, by a receiver of the mobile system, a first set of correction data which is broadcasted from a first transmitter, wherein the first set of correction data comprises Differential Global Navigation Satellite System (D-GNSS) correction data, estimating, using a real-time kinematics (RTK) method, a first position of the mobile system using at least a portion of the first set of correction data, estimating one or more unknown parameters of a precise point positioning (PPP) estimation method based at least on the estimated first position of the mobile system and the first set of correction data, and estimating a second position of the mobile system using the estimated one or more parameters and the PPP estimation method, wherein the second position of the mobile system is different from the first position of the mobile system.