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Adaptive digital sub-array beamforming and deterministic sum and difference beamforming, with jamming cancellation and monopulse ratio preservation

  • US 6,661,366 B2
  • Filed: 06/15/2001
  • Issued: 12/09/2003
  • Est. Priority Date: 06/15/2001
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a radar target of interest in the presence of multiple radar jamming interference sources, said method comprising the steps of:

  • forming a plurality of sub-arrays from an antenna array;

    digitally beamforming sub-array data from the plurality of sub-arrays and generating quadrant sub-array beams, each with a respective sub-array beam pattern for each of said plurality of sub-arrays, and each quadrant sub-array beam having nulls at identical null positions, said sub-array beams formed having a constraint of maintaining a given boresight gain of each said quadrant sub-array beam;

    steering the nulls associated with the quadrant sub-array beams in directions associated with the sources of interference;

    determining sum and difference beams from said plurality of sub-array beams for detecting said target of interest;

    determining a monopulse ratio based on the sum and difference beams; and

    estimating an angle of arrival of the target using the monopulse ratio.

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