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Method for reducing geometrical dilution of precision in geolocation of emitters using phase circles

  • US 6,285,319 B1
  • Filed: 01/27/2000
  • Issued: 09/04/2001
  • Est. Priority Date: 01/27/2000
  • Status: Expired due to Term
First Claim
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1. A method for determining the geolocation of an emitter, using at least one observer measuring signal change while moving on at least two observation tracks, the method comprising the steps of:

  • beginning the measurement of emitter signal change between a first observer position and a second observer position;

    predicting the second observer position at a time the last measurement from which signal change will be derived is made;

    utilizing knowledge of the measurement start and end points to determine a second pair of observer signal-change measurement start and end positions such that the emitter line-of-position (LOP) determined by the second signal change measurement will intersect the LOP associated with the first signal change measurement at possibly multiple points, but at each of these points intercept orthogonally to within the signal change measurement errors;

    determining the intersection points of the LOPs;

    assigning a likelihood to each intersection point for measuring the probability for each of the multiple intersection points that it is the emitter location;

    determining a correct emitter position from these likelihood weights; and

    generating an error associated with the emitter position estimate.

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