System and method for generating precise code based and...

G - Physics – 01 – S

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

Patent

CA 2172368

A GPS system that includes a GPS beacon (26) that receives a plurality of GPS signals (25), each having a carrier component and a pseudo-random code component, and generates in response thereto a plurality of beacon signals (27) having a carrier component phase locked to one of the carrier components and a pseudo-random code phase locked to one of the pseudo-random code components of the received GPS signals for transmission. A GPS receiver (32) receives the transmitted signals and makes Code Based Differential GPS position determinations by making range measurements for each of the pseudo-random code components of the GPS (25) and beacon (27) signals and in response computing values representing a position. Additionally, the GPS receiver can make Carrier Phase Differential GPS position determinations.

Système de positionnement global (GPS) comportant une balise GPS (26) recevant plusieurs signaux GPS (25) présentant chacun une composante de porteuse et une composante de code pseudoaléatoire. En réponse aux signaux GPS qui lui parviennent, la balise émet plusieurs signaux de balise (27) dont chacun présente une composante de porteuse, en verrouillage de phase avec l'une des composantes de porteuse et une composante de code pseudoaléatoire en verrouillage de phase avec l'une des composantes de code pseudoaléatoire des signaux GPS reçus destinés à la transmission. La balise retransmet alors l'ensemble des signaux. Le récepteur GPS (32) reçoit les signaux transmis et calcule des points GPS à différentiel basé sur le code utilisé, en effectuant des mesures de distances pour chacune des composantes de code pseudoaléatoire des signaux GPS (25) et de balise (27) en réponse aux valeurs de calcul représentant un point. De plus, le récepteur GPS peut effectuer des points GPS à différentiel de phase de porteuse.

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