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PASSIVE RANGING TECHNIQUE

  • US 3,789,410 A
  • Filed: 01/07/1972
  • Issued: 01/29/1974
  • Est. Priority Date: 01/07/1972
  • Status: Expired due to Term
First Claim
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1. Apparatus for passively measuring range to a radiating source comprising;

  • at least two physically separated antenna means for receiving signals from a radiating source;

    receiver means operatively connected to said at least two antenna means for producing output video signals and intermediate frequency signals, or RF signals;

    time of arrival computing means operatively connected to said receiver means and receiving said video signals and measuring the difference in time of arrival between the signals received at said at least two antenna means and producing a signal corresponding to bearing to the source;

    phase rate computer means operatively coupled to the output of said receiver means for receiving the intermediate frequency (or RF) signals therefrom and producing a sum signal and a quadrature sum signal each signal having a modulation envelope containing phase rate beat frequency information fb 1/ Delta T;

    means operatively connected to said phase rate computer means and receiving said sum signal and said quadrature signal for computing a phase rate beat frequency voltage Et Kfb where K is a normalizing constant;

    modifying means operatively receiving the bearing signal and modifying said bearing signal for various measured parameters; and

    combining means operatively connected to said modifying means and said phase rate computing means for combining said modified bearing signal and said phase rate beat frequency and outputting a signal representative of range to the emitting source.

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