Gnss receiver with enhanced accuracy using two signal carriers

Details Gnss receiver with enhanced accuracy using two signal carriers Gnss receiver with enhanced accuracy using two signal carriers

G - Physics

01

S

G01S 1/00 (2006.01)

Patent

CA 2625930

The invention concerns a satellite positioning receiver comprising at least one reception channel, each reception channel being designed to perform a combined processing of first S1 and second S2 frequency-separated radio signals, the signals being received by analog paths of the reception channel then digitized to be processed in digital paths of the reception channel. The invention is characterized in that each reception channel includes: first (160) and second (162) correlation circuits receiving respectively the first and second received digitized signals; carrier phase and code discriminators common to the two correlation circuits; a generator of local codes by code correlation process, said local codes being offset by a positive differential delay correction +.DELTA..tau.cal for one of the correlation circuits and, by a negative differential delay correction -.DELTA..tau.cal for the other, said corrections tending to compensate the relative delay difference between the two signals in the analog paths of the reception channel; a phase differential .DELTA..phi.cal correcting device tending to compensate the phase differential variation between the signals occurring in the analog paths of the reception channel. The invention is applicable to satellite positioning receiver.

Récepteur de positionnement par satellites comportant au moins un canal de réception, chaque canal de réception étant destiné à effectuer un traitement combiné d'un premier S1 et un second S2 signaux radioélectriques séparés en fréquence, les signaux étant reçus par des voies analogiques du canal de réception puis numérisés pour être traités dans des voies de réception numériques, caractérisé en ce que chaque canal de réception comporte: un premier (160) et un second (162) circuits de corrélation recevant respectivement le premier et le second signaux reçus numérisés; des discriminateurs de phase de porteuse et de code communs aux deux circuits de corrélation; un générateur de codes locaux par voie de corrélation de code, ces codes locaux étant décalés d'une correction de retard différentiel positive +.DELTA..tau.cal pour un des circuits de corrélation et, d'une correction de retard différentiel négative -.DELTA..tau.cal pour l'autre, ces corrections tendant à compenser l'écart relatif de retard entre les deux signaux dans les voies analogiques du canal de réception; un dispositif de correction de différentiel de phase .DELTA..phi.cal tendant à compenser l'écart différentiel de phase entre les deux signaux se produisant dans les voies analogiques du canal de réception. Application: récepteur de positionnement par satellites.

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