An apparatus and method for filtering a received signal

Details An apparatus and method for filtering a received signal An apparatus and method for filtering a received signal

H - Electricity

03

H

H03H 11/04 (2006.01) H03H 17/02 (2006.01) H04B 1/18 (2006.01)

Patent

CA 2203548

An apparatus (10) including a compressive receiver (22) detecting the received signal and a frequency agile filter (60) responsive to the compressive receiver (22). The frequency agile filter (60) filters the received signal. A method including the steps of detecting the received signal (204), downconverting the received signal to produce a downconverted signal (206), performing a dispersive delay line calculation on the downconverted signal to produce a pulsed signal having a plurality of pulses (208), comparing at least some of the pulses within the pulsed signal to a threshold (210), measuring the time delay of the pulses that exceed the threshold over a predetermined time interval (212), determining a filter frequency based on the time delay of the pulses (214), and filtering the received signal at the filter frequency (216).

Appareil (10) muni d'un récepteur à compression (22) pour détecter le signal reçu et d'un filtre à agilité de fréquence (60) réagissant au récepteur à compression (22). Le filtre à agilité de fréquence (60) filtre le signal reçu. Une méthode associée comporte les étapes suivantes : détecter le signal reçu (204), changer la fréquence du signal reçu pour produire un signal abaissé (206), procéder à un calcul de ligne à retard dispersive à partir du signal abaissé pour obtenir un signal d'impulsion comprenant un certain nombre d'impulsions (208), comparer au moins quelques-unes des impulsions présentes dans le signal d'impulsion à un seuil (210), mesurer le retard des impulsions dépassant ce seuil au cours d'une période prédéterminée (212), déterminer une fréquence centrale du filtre à partir du retard des impulsions (214), et filtrer en fréquence (216) le signal reçu.

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