System and method for adaptive interference cancelling

G - Physics – 01 – D

Patent

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G01D 3/032 (2006.01) G01S 7/28 (2006.01) G01S 7/292 (2006.01) G10K 11/175 (2006.01) G10K 11/34 (2006.01) H01Q 3/26 (2006.01) H04R 3/00 (2006.01) G01S 7/288 (2006.01) G01S 7/36 (2006.01) H04B 1/12 (2006.01)

Patent

CA 2259256

An adaptive system and method for reducing interference in a signal received from an array of sensors. Adaptive filters are used to generate cancelling signals that closely approximate the interference present in the received signal. The adaptive filter weights are converted into the frequency domain where the frequency representation values in a selected frequency range are truncated to avoid signal leakage involving narrow band signals. Decolorizing filters are used to produce the cancelling signals having a flat frequency spectrum. Normalized power difference is used to limit the operation of the adaptive filters to the case where there is some directional interference to be eliminated.

La présente invention a pour objet un système et un procédé adaptatifs de réduction du brouillage dans un signal reçu en provenance d'un réseau de capteurs. On utilise des filtres adaptatifs pour créer des signaux de suppression qui sont très proches du brouillage présent dans le signal reçu. Les valeurs pondérées des filtres adaptatifs sont converties dans le domaine fréquence où les valeurs de représentation des fréquences dans une gamme de fréquences donnée sont tronquées afin d'éviter des fuites de signaux, dont des signaux à bande étroite. On utilise également des filtres décolorants pour produire les signaux de suppression à spectre de fréquences plat. Enfin, on utilise une différence de puissance normalisée pour limiter l'utilisation des filtres adaptatifs au cas où il existe un brouillard directionnel à éliminer.

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