2.2.5. Handover

To update the state of the target for as long as possible, target needs to be tracked through multiple radars. Suppose Radar *r*<sup>1</sup> and *r*<sup>2</sup> are close to each other and lie in the same direction. In the scenario in which Target *t* enters coverage of *r*1, enters coverage of *r*2, leaves coverage of *r*<sup>1</sup> first, and then leaves coverage of *r*2, the scheduling that *r*<sup>1</sup> observes first and that *r*<sup>2</sup> then observes can be thought proper. We define "Radar *r*<sup>1</sup> hand over target to Radar *r*2" for the situation in which Radar *r*<sup>1</sup> tracks the target with Radar *r*<sup>2</sup> until stable measurement can be obtained after Radar *r*<sup>2</sup> starts target tracking.
