G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 5/14 (2006.01) G01S 1/00 (2006.01) G01S 1/04 (2006.01)
Patent
CA 2529197
The invention relates to a method and device for the demodulation of satellite radio navigation signals. The inventive method is used to demodulate radio navigation signals (s(t)) transmitted in spread spectrum and comprising a data channel which is modulated by a navigation message and a pilot channel which is not modulated by a navigation message, said data and pilot channels being combined into one multiplexing scheme in order to modulate a carrier. The method consists in: subjecting the signals of the pilot and data channels to despreading processing; and demodulating the despread data signal (r¿d?) in order to obtain the navigation message (d(t)), whereby the demodulation of the despread data signal (r¿d?) used to obtain the navigation message is performed with the aid of the carrier (r¿p?) obtained from the despreading processing of the pilot channel.
Pour démoduler des signaux de radionavigation (s(t)) émis en spectre étalé et comportant une voie de donnée modulée par un message de navigation, et une voie pilote non modulée par un message de navigation, la voie de donnée et la voie pilote étant combinées dans un schéma de multiplexage afin de moduler une porteuse, ce procédé consiste à appliquer aux signaux des voies pilote et de donnée un traitement de désétalement et à démoduler le signal de donnée désétalé (rd) pour obtenir le message de navigation (d(t)), la démodulation du signal de donnée désétalé (rd) pour obtenir le message de navigation étant effectuée à l'aide de la porteuse (rp) obtenue par le traitement de désétalement de la voie pilote.
Centre National D'etudes Spatiales
Smart & Biggar
LandOfFree
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