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Beamforming/null-steering adaptive array

  • US 4,651,155 A
  • Filed: 05/28/1982
  • Issued: 03/17/1987
  • Est. Priority Date: 05/28/1982
  • Status: Expired due to Term
First Claim
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1. An apparatus for cancelling undesired signals received with a desired signal, said apparatus comprising:

  • (a) first means for providing the desired and any undesired signals received with the desired signal;

    (b) a first adaptive control loop coupled to said first means, said first loop having a negative correcting output for minimizing the undesired signal;

    (c) a second adaptive control loop coupled to the first means, said second loop having a positive correcting output for maximizing the desired signal;

    (d) second means for summing the negative correcting output and the positive correcting output and providing a sum signal corresponding thereto;

    (e) a mixer for mixing the desired and any undesired signals with the sum signal to provide a mixed output;

    (f) said first adaptive control loop further comprising a first notch filter circuit coupled to the first means and providing a notch unmixed output, a second notched circuit coupled to the mixed output and providing a notch mixed output and a notch correlator correlating the notch unmixed output with the notch mixed output, said notch correlator providing the negative correcting output;

    (g) said second adaptive control loop further comprising a first bandpass filter circuit coupled to the first means and providing a bandpass unmixed output, a second bandpass filter circuit coupled to the mixed output and providing a bandpass mixed output and a bandpass correlator correlating the bandpass unmixed output with the bandpass mixed output, said bandpass correlator providing the positive correcting output.

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