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Abstract

An adaptive array for detecting a signal of interest (SOI) that includes antenna elements, digital Finite Impulse Response (FIR) filters having programmable filter weights, a digital beamformer having programmable array weights and an adaptive control unit. Each antenna output signal is processed by an FIR filter to produce a filtered element signal. The filtered element signals are combined by the beamformer to produce an adaptive array output. The adaptive control unit adjusts the filter and array weights to maximize the adaptive array response to the SOI while minimizing the response to interfering signals. The adaptive control unit can use the frequency, look angle or polarization of the SOI, to constrain the spatial gain or polarization in the direction of the SOI, or to form a pass band at the SOI frequency. The adaptive control unit can equalize the beamformer frequency response to compensate for dispersion introduced by diverse antenna locations.

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First Claim