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Multi target tracking initiation with passive angle measurements

  • US 6,292,136 B1
  • Filed: 09/14/1999
  • Issued: 09/18/2001
  • Est. Priority Date: 02/27/1997
  • Status: Expired due to Term
First Claim
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1. A track initiation method for multi target tracking by means of at least two passive sensors, comprising the steps of:

  • creating strobe tracks for each of the at least two sensors, where said strobe tracks are filtered sets of strobes, belonging to the same target;

    calculating strobe track crosses, including a step of calculating 2nd order strobe track crosses;

    selecting a strobe track cross as a probable target; and

    creating a target track, wherein said step of calculating 2nd order strobe track crosses comprises, for every pair of two said strobe tracks from different said sensors, the steps of;

    calculating a distance between said strobe tracks;

    rejecting the strobe track combination as a potential strobe track cross if the distance is larger than a predetermined value;

    calculating a closest point on each strobe track corresponding to said distance between said strobe tracks;

    calculating a cross-to-sensor distance between each closest point and each respective sensor;

    rejecting the strobe track combination as a potential strobe track cross if at least one of the cross-to-sensor distances exceeds a range of a corresponding said sensor; and

    calculating position and position uncertainty for strobe track crosses of the remaining strobe tracks combinations.

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