Method for automatically lowering the acquisition and...

G - Physics – 01 – C

Patent

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G01C 21/24 (2006.01) G01C 23/00 (2006.01) G01S 1/00 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2211340

A method for automatically lowering the acquisition and tracking thresholds of spread spectrum codes received in orbit by a receiver accessing an orbital navigator inside or outside the receiver, a phase loop and a code loop. The code loop for pseudo-random code tracking is "pushed" by fine speed assistance and compensates for the error between the actual speed and the calculated speed. The code loop for pseudo-random code acquisition is also "pushed" by fine speed assistance, and the search for the phase of the received code is performed around a phase prediction maintained by the fine speed assistance from the orbital navigator.

La présente invention concerne un procédé de réduction autonome des seuils d'acquisition et de poursuite des codes d'étalement de spectre reçus en orbite par un récepteur accédant à un navigateur orbital interne ou externe audit récepteur, d'une boucle de phase et une boucle de code. La boucle de code, chargée de la poursuite des codes pseudoaléatoires est "poussée" par l'aide de vitesse fine, et rattrape l'erreur entre la vitesse réelle et la vitesse calculée. La boucle de code, chargée de l'acquisition des codes pseudoaléatoires, est également "poussée" par l'aide de la vitesse fine, la recherche de la phase du code reçu s'effectuant autour d'une prédiction de phase entretenue par l'aide de vitesse fine provenant du navigateur orbital.

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