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Wideband adaptive array using the chirp transform

  • US 4,821,037 A
  • Filed: 09/10/1986
  • Issued: 04/11/1989
  • Est. Priority Date: 09/10/1986
  • Status: Expired due to Fees
First Claim
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1. An array processor for processing signals within a predetermined frequency bandwidth and suppressing interference received by an array of antennas including a main antenna and at least one auxiliary antenna, comprising:

  • means coupled to the main antenna for transforming the main antenna signal from the time domain into the frequency domain by a chirp transformation conducted over a time interval of duration T, wherein respective frequency components of the main antenna signal appear in time sequence;

    means coupled to the auxiliary antenna for transforming the auxiliary antenna signal from the time domain into the frequency domain by a chirp transformation conducted over a time interval T in synchronism with said chirp transformation of the main antenna signal, wherein respective frequency components of the auxiliary antenna signal appear in time sequence;

    means for weighting the transformed auxiliary antenna signal by a time variable coefficient in synchronism with said chirp transformation;

    means for combining said transformed main antenna signal and said weighted, transformed auxiliary antenna signal to provide a combined transformed array signal; and

    means for transforming the combined array signal to the time domain by an inverse chirp transformation to provide an array processor output.

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