Satellite signal receiver with detector of incoherence...

G - Physics – 01 – S

Patent

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G01S 5/14 (2006.01) G01S 1/00 (2006.01)

Patent

CA 2257194

The invention concerns GPS receivers, in particular those located on fixed ground stations and used in differential systems for measuring position. To eliminate as far as possible multiple traverse influence on the precision of the measured position, it is proposed to detect if the position measurements are coherent with the speed measurements, the coherence being measured by the difference variations V¿i? - dPRC¿i?/dt, where V¿i? is the relative speed measured on the axis of the i?th¿ satellite, and dPRC¿i?/dt is the variation with time of the measured position. If the coherence is not sufficient, the position variations do not correspond to the measured speed, it can be considered that the measurement on this satellite is erroneous, and this satellite is eliminated. In the presence of multiple traverse, the above difference must be seen to vary periodically. This variation detection can done by a Fourier transform on a sufficient number of samples.

L'invention concerne les récepteurs GPS, notamment ceux qui sont situés sur des stations fixes au sol et servent dans des systèmes différentiels de mesure de position. Pour éliminer autant que possible l'influence des multitrajets sur la précision de la position mesurée, on propose selon l'invention de détecter si les mesures de position sont cohérentes avec les mesures de vitesse, la cohérence étant mesurée par les variations de la différence Vi- dPRCi/dt, où Vi est la vitesse relative mesurée selon l'axe du iièmesatellite, et dPRCi/dt est la variation temporelle de position mesurée. Si la cohérence n'est pas suffisante, les variations de position ne correspondent pas à la vitesse mesurée, on peut considérer que la mesure sur ce satellite est entachée d'erreur, et on élimine ce satellite. En présence de multitrajets on doit voir la différence ci-dessus varier périodiquement. La détection de cette variation peut se faire par une transformée de Fourier sur un nombre d'échantillons de mesure suffisant.

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