A motorboat’s wakes can cause difficulties as they appear in a track’s gate. While a motorboat is idle for long enough,
the gate size reduces to its minimum. Immediately after, if motorboat makes a stop-move maneuver with maximum
acceleration, true radar measurement can appear off the gate. In this case, the tracker can continue to update the track
with target’s wake measurements falling in gate and this can mislead the tracker.
In order not to miss the true measurement belonging to a track, a secondary gate should be created with larger size than
that of the primary gate at the same gate center. However, this gate should only be created when an anomaly is detected
at the tracker. This paper investigates when such secondary gates should be created.
In this paper, a score-based method is presented to control gating in the presence of wake left behind a suddenly
accelerated boat. This method is based on scoring the probability distributions characterizing the number radar
measurements. The number of detections coming from clutter is K-distributed and the number of detections belonging to
true target is Poisson distributed across the surveillance region. The method treats the motorboat’s wake as target
originated measurement rather than clutter. Therefore, a probability distribution similar to true target’s with a different
parameter is used to score the wake separately. Based on the scores, security gating decision is made. The real data
experiments show that track continuity is maintained successfully with the use of score-based gating control method.