Abstract:
본 발명에 의한 정밀 위치 추정 방법은, 코드 측정치를 이용하여, 이동국의 초기 위치와 반송파 측정치의 미지정수를 추정하는 제1 단계; 상기 미지정수의 검색범위를 설정하는 제2 단계; 반송파 측정치로 에폭간 위치 이동량을 계산한 후 저장하는 제3 단계; 미지정수를 추정하고 공분산을 계산하는 제4 단계; 미지정수 검색범위 내의 미지정수 후보를 평가하는 제5 단계; 미지정수를 결정하는 제6 단계; 상기 결정된 미지정수를 이용하여 정밀측위를 하는 제7단계; 를 포함하는 것을 특징으로 한다.
Abstract:
The disclosure generally relates to position sensors, and more particularly to repair of carrier-phase cycle slips using displacement data. An apparatus for use in position sensing may include a displacement sensor, a positioning signal receiver, a memory, and a processor coupled to the displacement sensor, the positioning signal receiver, and the memory. The processor and memory may be configured to processor and memory are configured to detect a loss of lock of a first carrier tracking loop associated with the first set of carrier-phase measurements, wherein the first carrier tracking loop is associated with a first integer ambiguity, estimate, based on the displacement data, an ambiguity increment to the first integer ambiguity subsequent to the detected loss of lock, and resolve a second integer ambiguity associated with the second set of positioning signals based on the first integer ambiguity and the estimated ambiguity increment.
Abstract:
Disclosed are methods, devices and systems for determining a signal search space for acquisition of a satellite positioning system (SPS) signal. For example, a signal transmitted by a terrestrial-based transmitting device may be acquired for use, at least in part, to adjust a receiver for acquisition of SPS signals. The terrestrial-based transmitting device may be classified based, at least in part, on a factor obtained from the acquired signal. An SPS signal search space for the receiver may then be based, at least in part, on a frequency uncertainty corresponding to the classification of said transmitting device.
Abstract:
L'invention concerne un procédé de poursuite de la phase porteuse d'un signal reçu d'un satellite par un porteur au moyen d'une boucle de poursuite de la phase porteuse, ledit signal étant acquis par un système de navigation du porteur qui comprend un récepteur de localisation par radionavigation et une unité autonome, le récepteur étant adapté pour acquérir et poursuivre la phase de la porteuse du signal issu du satellite.
Abstract:
Methods and apparatus are provided for processing a set of GNSS signal data derived from observations of GNSS signals of multiple transmitters over multiple epochs, the GNSS signals having a first signal and a second signal in a first band which can be tracked as a single wide-band signal and each of which can be tracked separately, comprising: obtaining carrier-phase observations of the first signal, obtaining carrier- phase observations of the second signal, obtaining code observations of the wide-band signal, and estimating from a set of observables comprising the carrier-phase observations of the first signal, the carrier-phase observations of the second signal and the code observations of the wide-band signal values for a set of parameters comprising: position of a receiver of the GNSS signals, clock error of a receiver of the GNSS signals, and an array of ambiguities comprising an ambiguity for each transmitter from which carrier-phase observations of the first signal are obtained and an ambiguity for each transmitter from which carrier-phase observations of the second signal are obtained.
Abstract:
Le procédé vise à optimiser la phase d'acquisition d'un signal à spectre étalé par un récepteur mobile. Il consiste à rechercher, pour différentes hypothèses de fréquences et parmi tous les chemins d'évolution possibles desdites fréquences entre deux instants initial et final marquant le début et la fin d'une intégration cohérente du signal, le chemin dont l'énergie est maximale. Application en particulier aux systèmes globaux de navigation par satellites de type GPS (Global Positioning System), Galileo ou Glonass.
Abstract:
A device to perform DFT calculations, for example in a GNSS receiver, including two banks of multipliers by constant integer value, the values representing real and imaginary part of twiddle factors in the DFT. A control unit selectively routes the data through the appropriate multipliers to obtain the desired DFT terms. Unused multipliers are tied to constant input values, in order to minimize dynamic power.
Abstract:
Disclosed is an adaptive receiver configured to receive signals from satellite navigation systems to determine receiver coordinates and configured to use a co-op tracking system to evaluate full phases of carrier phases for N navigation satellites in view. The adaptive receiver includes channels with autonomous wideband phase lock loops (PLLs) in a guiding status. The wideband PLLs are configured to track phases of carrier signals from satellites having high SNR and configured to produce control codes for target designations of varying carrier frequency. The adaptive receiver also includes channels with narrow-band PLLs in a guided status. The narrow-band PLLs can track phases of carrier signals of satellites with low SNR and are configured to use target designations from the wideband PLLs in guiding status and a prediction of frequency change caused by satellite movement. The adaptive receiver also includes channels with open PLLs in a standby mode.