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Range measurement method and apparatus having scanning interferometers and range signal processor

  • US 4,771,290 A
  • Filed: 09/28/1984
  • Issued: 09/13/1988
  • Est. Priority Date: 09/28/1984
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining the range of a source of electromagnetic emission from a monitoring location, comprising:

  • movable platform means;

    first and second interferometer means mounted on said platform at a spacing d along a base line and having parallel receiving axes for receiving such source of emission;

    means for moving said platform means so that said receiving axes scan at an angular rate ω

    s relative to such source of emission and thereby produce interferometer signals having a relative time difference t21 ;

    angle of arrival means for sensing and producing a signal representing an angle of arrival φ

    of the source of emission relative to the base line of said first and second interferometer means;

    time difference signal processing means for producing a signal t21 representing a rate of change of said time difference t21 ; and

    range signal processing means coupled to receive signals representing the angle of arrival φ and

    the rate of time difference change t21 to produce an output signal of range R as a function thereof in accordance with the relationship ##EQU11##

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