Tracking target by using anti-helicopter mine(AHM) is actually the bearing-only measurement because precision of range detected by passive acoustic measurement can t satisfy the need of tracking.

• 目前被动声探测距离精度还不能满足跟踪的需要,因此,反直升机智能雷对目标的跟踪问题归结为仅有角测量的跟踪问题。