Patent ID: 6292136
Filing Date: 2001-09-18
Classification: G01S

Abstract:
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; andcreating 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; andcalculating position and position uncertainty for strobe track crosses of the remaining strobe tracks combinations.