Track handover between regions within a surveillance area

A method of reducing tracking errors in an area comprised of stationary touching surveillance regions, a first region having an edge zone touching an edge zone of a second region, the method comprising steps of:

• transmitting a plurality of signals into a first region;
• analyzing the received signals to produce target measurements;
• selecting a set of measurements to update a track of a first target at least in part using a Probabilistic Data Association filter method;
• calculating a probability of a measurement of the first target being within the selected set;
• updating target tracks in each zone using measurements of the set and the calculated probability;
• allocating target tracks to the correct zone;
• and
• displaying the tracks on a visual display means.

A method for tracking targets in first and second stationary sensor regions, the first region having an edge zone touching an edge zone of the second region, the method comprising steps of:

• establishing a first track for a target in the edge zone of the first region;
• storing the first track in a memory block that is shared by tracks of targets in touching edge zones of the first and second regions;
• transmitting surveillance signals into the second region;
• receiving signals from the second region;
• deriving update measurements from the update signals;
• associating the update measurements with the first track;
• updating the first track using the update measurement.