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Difference-in-time-of-arrival direction finders and signal sorters

  • US 5,260,711 A
  • Filed: 02/19/1993
  • Issued: 11/09/1993
  • Est. Priority Date: 02/19/1993
  • Status: Expired due to Fees
First Claim
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1. In a system responsive to the difference-in-time-of-arrival of received radio-wave signals;

  • wherein said system comprises at least first and second antennas spaced apart by a predetermined distance for receiving radio-wave signals within a given frequency band, variable time delay means for relatively time delaying the radio-wave signals received by one of said first and second antennas with respect to the radio-wave signals received by the other of said first and second antennas by an amount determined by said time delay means, and auto-correlation means responsive to the correlation between the delayed radio-wave signals received by said one of said first and second antennas and the radio-wave signals received by said other of said first and second antennas;

    the improvement wherein said auto-correlation means comprises;

    first means responsive to the relative phases of the relatively delayed radio-wave signals received by said one of said first and second antennas and the radio-wave signals received by said other of said first and second antennas for deriving a given output therefrom in which solely in-phase relatively delayed radio-wave signals received respectively by said first and second antennas are substantially cancelled and out-of-phase relatively delayed radio-wave signals received respectively by said first and second antennas are substantially passed; and

    second means including variable gain and delay means and responsive to said output of said first means applied thereto for reducing the relative power of said out-of-phase relatively delayed radio-wave signals with respect to that of said in-phase relatively delayed radio-wave signals in an output of said auto-correlation means.

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