Digital interference suppression system for radio frequency...

H - Electricity – 01 – Q

Patent

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H01Q 21/24 (2006.01) G01S 1/00 (2006.01) G01S 1/04 (2006.01) G01S 3/16 (2006.01) H01Q 3/26 (2006.01) H04B 1/10 (2006.01) H04B 15/00 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2288929

A digital signal processing system that produces an adaptive cancellation arrangement which nulls out all types of concurrent interference and/or jamming signals received by Global Positioning System (GPS) or spread spectrum receiver (7) from diverse antennas. In the present arrangement, orthogonal components of the composite received signal are separated by the receive antenna arrangement (3) and adjusted in the digital network (5) between the antenna (3) and the receiver (7) in phase and amplitude to optimally cancel components. The arrangements can be synergistically combined with digital adaptive transversal filter technology which is primarily used to supplement suppression performance by reducing narrowband interference in the band. The orthogonal received signal components from the GPS satellite constellation and from interference sources are combined in the present arrangement to adaptively create a null that attenuates interference sources while slightly modifying the GPS received signals.

La présente invention concerne un système de traitement de signaux numériques assurant une annulation adaptative de tous types de signaux de brouillage concomitants reçus en provenance d'antennes en diversité par un récepteur GPS ou un récepteur (7) à spectre étalé. Dans le dispositif de l'invention, les composantes orthogonales du signal composite reçu sont séparées par le dispositif d'antenne de réception (3) et calés en phase et en amplitude dans le réseau numérique (5) entre l'antenne (3) et le récepteur (7) de façon à annuler les composantes considérées de matière optimale. Le dispositif peut se combiner en synergie avec une technique de filtrage numérique transversal adaptatif permettant principalement d'accroître l'efficacité de la suppression grâce à une réduction des interférences bandes étroites dans la bande. Les composantes orthogonales du signal reçues de la constellation de satellites GPS et des sources de brouillage se combinent dans le dispositif de l'invention de façon à assurer en mode adaptatif une annulation atténuant les sources de brouillage tout en modifiant les signaux GPS reçus.

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