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Sidelobe canceller with programmable correlation signal weighting

  • US 3,982,245 A
  • Filed: 07/15/1974
  • Issued: 09/21/1976
  • Est. Priority Date: 07/15/1974
  • Status: Expired due to Term
First Claim
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1. In a canceller:

  • a. a main signal transmission channel having an output terminal and an input terminal coupled to receive a signal which may include both desired and undesired signal content;

    b. an auxiliary signal transmission channel coupled to receive a signal including primarily said undesired signal;

    c. cross correlation means connected to the output terminal of said main signal transmission channel and to said auxiliary signal transmission channel for detecting the relative amplitude and phase of said main and auxiliary channel signals and generating a correlation signal indicative of the result of such correlation;

    d. correlation signal processing means including narrowband filter means and switch means connected in series relation, said switch means being selectively operable to pass the correlation signal generated by said cross correlation means;

    e. a compensating cross feed network coupled to said auxiliary signal transmission channel to receive said undesired signal and to said correlation signal processing means to receive the correlation signal as processed thereby, said cross feed network being responsive to the signals coupled thereto to generate a correction signal of amplitude and phase corresponding to the undesired signal content of the main signal transmission channel; and

    f. means interposed between said main channel input and output terminals for subtracting said correction signal from said main channel signal thereby to reduce the undesired signal content thereof.

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