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Self-coherence restoring signal extraction apparatus and method

  • US 5,255,210 A
  • Filed: 08/03/1992
  • Issued: 10/19/1993
  • Est. Priority Date: 10/28/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for adapting an array of antennas upon which one or more signals impinges and extracting a signal of interest s(t) therefrom, comprising:

  • (a) receiving means for receiving on an array of antennas upon which one or more signals impinges, a plurality of input signals represented by a signal input vector x(t) having M components in which each component comprises an electrical signal representing a complex measurement of a self-coherent signal of interest s(t) contained in said input signals together with interference from noise and/or other signals;

    (b) reference signal means for generating a reference signal vector r(t) from said signal input vector x(t), said reference signal means coupled to an output of said receiving means;

    (c) said reference signal means including filtering means for filtering each component of said signal input vector x(t) through a predetermined filter, said reference signal means including shifting means for frequency shifting each component of said signal input vector x(t) by a frequency α

    ;

    (d) weight means for providing and updating a weight vector w having M components from said signal input vector x(t), said weight means including a first input coupled to an output of said receiving means, said weight means including a second input coupled to an output of said reference signal means; and

    (e) summing means for generating an output signal y(t) having a measure of self-coherence, said summing means including a first input coupled to an output of said receiving means, said summing means including a second input coupled to an output of said weight means;

    (f) wherein said weight means provides and updates said weight vector w to maximize self-coherence in said output signal y(t).

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