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Determining fix confidence scores in direction finding systems

  • US 5,389,936 A
  • Filed: 06/24/1993
  • Issued: 02/14/1995
  • Est. Priority Date: 06/01/1990
  • Status: Expired due to Fees
First Claim
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1. A method of determining a fix confidence score for each source of radiation detected by direction finding stations in known separated locations in a direction finding system, which stations each produce a set of bearings of the sources each detects, each bearing having an error predetermined for the associated station, and a triangulation process being used to fix the position of the sources, characterised in that there are at least three direction finding stations, in that each fix confidence score is formed for a combination of bearings taken one each from the respective stations, in that one bearing of each of the combinations is taken in turn as a spoke directed at a source, in that the triangulation process generates a bar of intersection points along the spoke for each other bearing of the combination, each bar corresponding to the error of each other bearing, in that the number of overlaps between pairs of bars along the spoke is totalled to give a spoke score, and in that the spoke scores for all spokes of the combination are summed to form the fix confidence score for a source which may be associated with the combination.

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