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Direct sequence spread spectrum receiver and antenna array for the simultaneous formation of a beam on a signal source and a null on an interfering jammer

  • US 5,694,416 A
  • Filed: 02/24/1995
  • Issued: 12/02/1997
  • Est. Priority Date: 02/24/1995
  • Status: Expired due to Fees
First Claim
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1. A radio receiver for simultaneously hulling out an interference signal and enhancing a signal-of-interest that differ at least in their azimuth and/or elevation relative to the receiver, comprising:

  • an antenna array with "N" number of individual antennas spatially distributed at random and providing for the reception of said interference signal and said signal-of-interest, wherein a first phase difference in the carrier frequency of said interference signal exists between any two antennas that is substantially different than a second phase difference in the carrier frequency of said signal-of-interest for said same two antennas;

    multi-channel receiver down-conversion means connected to respective antennas in the antenna array; and

    combining means connected to the multi-channel receiver down-conversion means for simultaneously hulling out said interference signal and enhancing said signal-of-interest based on said first and second carrier frequency phase differences;

    wherein, said interference is determined to be a jammer from a set of pre-despread spatial correlation measurements and that provide for an interference autocorrelation estimate;

    the combining means provides for the use of said interference autocorrelation estimate to remove said interference from a post-despread aperture vector, and which leaves only a strong signal-of-interest; and

    wherein, the antenna array is adaptive and provides for simultaneous maximization of a signal-of-interest and a minimization of both narrowband and wideband jamming interference from a variety of directions that can vary in real-time by providing for an adjustment of a plurality of direct sequence spread spectrum (DSSS) local code phases once a code and a code phase lock have been achieved to effectively aim an antenna-array-reception-pattern null in a direction of a jammer.

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