0.2.3.3.3.1.4 Gating Parameters

The gating parameters set is used in the association process to provide a boundary for the points that can be associated with a given track. These parameters are target-specific. Table 9 lists each of these parameters.

The gating gain is a factor by which the gating volume can be increased to search for points to associate with the track. The gating volume can be estimated as the volume of the ellipsoid, computed as , where a, b, and c are the expected target dimensions in range (m), angle (rad), and doppler (m/s).

For example, consider a person as a radar target. For the target center, we could want to reach ±0.45 m in length (a = 0.9), ±3 degree in azimuth (b = 6π / 180), and ±5.18 m/s in radial velocity (c = 10.36), resulting in a volume of approximately 4.

In addition to setting the volume of the gating ellipsoid, the limits can be imposed to protect the ellipsoid from overstretching. The limits are the function of the geometry and motion of the expected targets. For example, setting the WidthLimit to 8 m does not allow the gating function to stretch beyond 8 m in width.