Split c/a code receiver

G - Physics – 01 – S

Patent

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Details

G01S 5/14 (2006.01) G01S 1/00 (2006.01) G01S 1/04 (2006.01)

Patent

CA 2322643

A GPS receiver that acquires and tracks a split-C/A code separately aligns with the received signal the phases of a locally-generated 10.23 MHz square wave, which can be thought of as a 20.46 MHz square-wave code, and a locally-generated 1.023 MHz C/A code. The receiver first aligns the phase of the locally-generated square-wave code with the received signal, and tracks one of the multiple peaks of the split-C/A code autocorrelation function. It then shifts the phase of the locally-generated C/A code with respect to the phase of the locally-generated square-wave code, to align the local and the received C/A codes and position the correlators on the center peak of the split-C/A. The receiver then tracks the center peak directly, using a locally-generated split-C/A code.

La présente invention concerne un récepteur GPS qui fait l'acquisition et le suivi d'un code C/A dédoublé et qui cale séparément sur le signal reçu les phases d'une onde carrée d'un signal 10,23 MHz généré localement. On peut avoir localement un code onde carrée de 20,46 MHz pour un code C/A de 1,023 MHz localement généré. Le récepteur commence à aligner la phase du code onde carrée généré localement sur le signal reçu, et fait le suivi de l'une des différentes crêtes de la fonction d'autocorrélation du code C/A dédoublé. Il effectue ensuite un déphasage du code C/A localement généré par rapport à la phase du code onde carrée localement généré, de façon à caler l'un sur l'autre les codes C/A locaux et reçus, et de façon à centrer les corrélateurs sur la crête centrale du code C/A dédoublé. Le récepteur utilise alors le code C/A dédoublé généré localement pour faire directement le suivi de la crête centrale.

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