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Adaptive antenna array

  • US 4,780,721 A
  • Filed: 03/21/1986
  • Issued: 10/25/1988
  • Est. Priority Date: 07/23/1984
  • Status: Expired due to Term
First Claim
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1. A method of removing undesired directional interference jammer signals from desired signals and maximizing a signal-to-noise ratio using an orthogonalizer array which includes processors to which digitized signals from a series of antennas are fed, comprising the sequential steps of:

  • (a) determining a time when the desired signal is not present,(b) nulling the directional interference sources at said time the desired signal is not present, by adjusting weight values in said orthogonalizer array using an intelligent controller to which output signals of processors of said orthogonalizer array are applied, and using said weight value determined for each said processor of said orthogonalizer array,(c) freezing said weight values in the array above a null row, at which the jammers have been removed,(d) nulling said desired signal at a row below said null row,(e) beamforming on said desired signal at said null row during the presence of said desired signal after nulling said directional interference jammers,(f) freezing the weights in the beamformer and row below the null row, and(g) nulling any late directional interference jammers appearing on said beamforming desired signal.

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