Multipath error reduction in a spread spectrum receiver for...

H - Electricity – 04 – B

Patent

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H04B 1/12 (2006.01) G01S 1/00 (2006.01) G01S 5/14 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2229069

A receiver of a radio frequency signal having a pseudo-random noise (PRN) code, and techniques of processing such a signal that are especially adapted for ranging applications. A signal corresponding to the PRN code is locally generated and used for decoding the received signal in a manner to reduce ranging errors that can result when multipath (delayed) versions of the radio frequency signal are also present. A significant application of the receiver and signal processing techniques of the present invention is in a Global Positioning System (GPS), wherein a number of such signals from several satellites are simultaneously received and processed in order to obtain information of the position, movement, or the like, of the receiver. A delay locked loop (DLL) correlator, provided in each of the receiver's multiple processing channels, locks onto a line of sight signal from one of the satellites with the effect of any multipath signal(s) being significantly reduced.

L'invention concerne un récepteur d'un signal haute fréquence ayant un code de bruit pseudo-aléatoire (BPA) et des techniques de traitement d'un tel signal, convenant tout particulièrement à des mesures de distance. Un signal correspondant au code (BPA) est généré localement et utilisé pour décoder le signal reçu, de manière à diminuer les erreurs de mesure de distance qui peuvent se produire en cas de propagation du signal haute fréquence par des trajets multiples (signal retardé). Une application importante des techniques de réception et de traitement des signaux de l'invention concerne le système GPS (Global Positioning System), où un certain nombre de ces signaux sont reçus simultanément de plusieurs satellites et traités de sorte qu'une information concernant la position, le mouvement et similaire, du récepteur soit produite. Un corrélateur à boucle à retard de phase placé dans chacun des canaux de traitement multiples du récepteur, effectue un verrouillage sur la ligne de visée empruntée par le signal depuis le satellite, ce qui a pour effet de réduire sensiblement le ou les signaux à trajets multiples.

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