Beamformer for multi-beam receive antenna

H - Electricity – 01 – Q

Patent

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Details

H01Q 3/26 (2006.01) G01S 13/48 (2006.01) G01S 13/68 (2006.01) H01Q 21/06 (2006.01) H01Q 25/00 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2466655

A phased array antenna system that is operative to simultaneously form multiple beams without requiring an undue amount of hardware. The system collects propagating energy with a number of antenna elements to form multiple beams, encodes the beams as the energy is collected, combines the encoded beams, and then decodes the combined signal to separate the beams. In this way, the beams can be formed with a single set of antenna hardware instead of requiring a multiplicity of antenna hardware, one for each beam. Frequency coding may be implemented by repeatedly applying a Doppler phase shift to each beam, and then using a Doppler filter to separate the beams. Alternatively, a code division multiplexing technique may be implemented by using a CDMA code generator to apply a code to each beam, and then using a CDMA filter to separate the beams.

L'invention concerne un système d'antenne réseau à commande de phase qui permet de former simultanément des faisceaux multiples sans requérir une quantité exagérée de matériel. Ce système fait intervenir un certain nombre d'éléments d'antenne pour capter l'énergie propagée et former des faisceaux multiples, code ces faisceaux lorsque l'énergie est captée, combine les faisceaux codés, puis décode le signal combiné pour séparer les faisceaux. Ainsi, les faisceaux peuvent être formés au moyen d'un seul ensemble de matériels d'antenne, un pour chaque faisceau. Par ailleurs, l'application itérative d'un déphasage Doppler à chaque faisceau permet d'exécuter le codage en fréquence ; un filtre Doppler permettant de séparer les faisceaux. Dans une variante, une technique de multiplexage par répartition en code mise en oeuvre à l'aide d'un générateur de code CDMA permet d'appliquer un code à chaque faisceau, l'utilisation d'un filtre CDMA permettant ensuite de séparer les faisceaux.

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