G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 1/00 (2006.01) H03L 7/085 (2006.01)
Patent
CA 2680389
The invention pertains to the field of devices for receiving satellite radio-navigation signals, the signals being transmitted at a carrier frequency, said device including at least means for generating a local signal at a local frequency and a tracking device including a feedback loop, or so-called carrier loop, for the phase control of the local frequency onto the carrier frequency, said loop including a hardware portion and a software portion. The software portion carries out the functions of discriminating the correlated signal phase and filtering said phase. In the different devices of the invention, the software portion further includes correction functions substantially based on the linear variation coefficients between the local phases .phi.locale provided after each elementary calculation cycle. The device of the invention increases the loop band and the dynamic stability without modifying the pre-detection band and the workload of the software.
Le domaine général de l'invention est celui des dispositifs de réception de signaux de radionavigation par satellite, lesdits signaux reçus étant émis à une fréquence porteuse, ledit dispositif comprenant au moins des moyens permettant de générer un signal local à une fréquence locale et un dispositif de poursuite comportant une boucle de rétroaction dite boucle de porteuse permettant d'asservir en phase la fréquence locale sur la fréquence porteuse, ladite boucle comportant une partie matérielle et une partie logicielle. La partie logicielle réalise les fonctions de discrimination de la phase du signal corrélé et le filtrage de la dite phase. Dans les différents dispositifs selon l'invention, la partie logiciel comporte, en outre, des fonctions de correction dépendant essentiellement des coefficients de variation linéaire entre les phases locales .phi.locale délivrées après chaque cycle élémentaire de calcul. Le dispositif proposé permet d'augmenter la bande de boucle et la tenue à la dynamique sans changer la bande de pré-détection et la charge de travail du logiciel.
Depraz David
Guillard Patrice
Martin Nicolas
Marks & Clerk
Thales
LandOfFree
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