A method and device for demodulating galileo alternate...

H - Electricity – 04 – L

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H04L 27/06 (2006.01) G01S 1/04 (2006.01)

Patent

CA 2579359

A method for demodulating alternate binary offset carrier signals comprising at least two subcarriers (E5a, E5b) each having an in-phase and a quadrature component modulated by pseudo-random codes, the quadrature components (E5aQ, E5bQ) being modulated by dataless pilot signals, the in-phase components (E5al, E5bl) being modulated by data signals, said method comprising steps of: converting the alternate binary offset carrier signals into an intermediate frequency; band-pass filtering the converted signals and sampling the filtered signals; generating a carrier phase and carrier phase-rotating the sampled signals by said carrier phase; correlating the rotated sampled signals; and generating for each subcarrier (E5a, E5b) pseudo-random binary codes and a subcarrier phase, which are used to correlate the rotated sampled signals.

L'invention concerne un procédé de démodulation de signaux de porteuse à décalage binaire alterné, comprenant au moins deux sous-porteuses (E5a, E5b), chacune ayant un composant en phase et un composant en quadrature, modulé par des codes pseudo-aléatoires, les composants en quadrature (E5aQ, E5bQ) étant modulés par des signaux pilote sans données, les composants en phase (E5aI, E5bI) étant modulés par des signaux de données. Le procédé est caractérisé en ce qu'il comprend les étapes suivantes : conversion des signaux de porteuse à décalage binaire alterné en une fréquence intermédiaire ; filtrage passe-bande des signaux convertis et échantillonnage des signaux filtrés ; génération d'une phase porteuse et d'une phase porteuse entraînant en rotation les signaux échantillonnés par ladite phase porteuse ; corrélation des signaux échantillonnés rotatifs ; et génération, pour chaque sous-porteuse (E5a, E5b) de codes binaires pseudo-aléatoires et d'une phase sous-porteuse, qui sont utilisés pour corréler les signaux échantillonnés rotatifs.

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