AUV探测声纳系统的运动多目标波达方向估计

Estimation of the DOA of Multiple Moving Targets by Detected Sonar Systems on AUV

由于AUV的运动或探测目标移动,AUV上声呐阵接收的回波信号的方向往往是不断变化的。因此,必须用递推的信号子空间估计算法,来解决AUV探测声纳的多目标回波方向的估计问题。AUV上的探测声纳阵中换能器数目少,采样频率有限,同时回波信号角度变化较大,这时,普通PAST和NIC法跟踪可靠性很差。针对这一问题,我们构造了滑动窗的PAST法和滑动窗的NIC法,大大提高了跟踪可靠性,使其可以很好地应用到AUV上的声探测系统中。

Because either an AUV or the targets to be detected are moving all the time, the iterated signal subspace estimate methods have to be used in AUV for the estimation of the DOA of multiple moving targets. Not many sonar transducers can be installed on an AUV, therefore, the sampling rate is limited. Moreover, the direction of the signal arrival changes a lot. Thus, the common PAST and NIC methods cannot track the targets reliably. A sliding window PAST and sliding window NIC methods are proposed in this paper to solve afore mentioned problem. The tracking performance is greatly improved by our method, and we are sure it can be used in AUV sonar system.