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Digital modular adaptive antenna and method

  • US 6,823,174 B1
  • Filed: 10/11/1999
  • Issued: 11/23/2004
  • Est. Priority Date: 10/11/1999
  • Status: Expired due to Term
First Claim
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1. A method of adapting an antenna beam to current operating conditions comprising:

  • determining a maximum gain value of a sidelobe region of an adaptive antenna pattern and a corresponding angle at which said maximum gain value is achieved;

    determining a min-max gradient of said adaptive antenna pattern at said corresponding angle;

    determining a next value of a first partial weighting value according to a current value of said first weighting value, a first predetermined step size, a first predetermined decay constant and said min-max gradient, wherein said next value of said first partial weighting value tends to limit said maximum gain value within said sidelobe region;

    determining a null-steering gradient of an adaptation error based upon a set of cross-correlation measurement samples reflecting said current operating conditions;

    determining a next value of a second partial weighting value according to a current value of said second partial weighting value, a second predetermined step size, a second predetermined decay constant and said null-steering gradient, wherein said next value of said second partial weighting value tends to steer a null in the direction of an interfering signal received through said sidelobe region; and

    updating a beamforming weight based upon said next value of said first partial weighting value and said next value of said second partial weighting value.

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