Method and dual-frequency gps receiver

Details Method and dual-frequency gps receiver Method and dual-frequency gps receiver

G - Physics

01

S

G01S 1/04 (2006.01) G01S 1/00 (2006.01)

Patent

CA 2470838

The invention concerns satellite radio navigation, in particular GPS, Galileo, GLONASS type satellite radio navigation. The solutions proposed in prior art for correcting ionospheric error by using a dual-frequency receiver reduces the robustness of the measurement relative to dynamic stress if the band used is narrow and less accurate if the band used in large. The invention provides a method comprising at least the following steps: modifying the mark of the dual-frequency base to an (average, variation) base; correcting on at least the variation loop (413) so as to obtain the difference of speeds in said (average, variation) base, inverse mark modification so as to calculate from the difference of speeds in the (average, variation) base the relative speed in the dual-frequency base; correcting the code speed for each of the two frequencies by the relative speed obtained in the dual-frequency base.

L'invention concerne la radionavigation par satellite, notamment la radionavigation par satellite de type GPS (Global Positioning System), Galileo, GLONASS (Global Navigation Satellite System, définition russe). Les solutions préconisées par l'état de l'art pour corriger l'erreur ionosphérique par l'utilisation de récepteur bi-fréquence rendent la mesure moins robuste à la dynamique si la bande utilisée est étroite et moins précise si la bande utilisée est large. L'invention propose un procédé comportant au moins les étapes suivantes : - un changement de repère de la base bi-fréquence vers une base (moyenne, écart), - une correction sur au moins la boucle aux écarts (413) afin d'obtenir la vitesse aux écarts dans cette base (moyenne, écart), - un changement de repère inverse afin de calculer à partir de la vitesse aux écarts dans la base (moyenne, écart) la vitesse relative dans la base bi- fréquence, - une correction de la vitesse de code pour chacune des deux fréquences par la vitesse relative obtenue dans la base bi-fréquence.

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