波束域高分辨方位估计的方法、统计性能及水池实验结果

The algorithm performance and experimental result of beam-spacedirection-of-arrival estimation

本文针对水声设备的实际应用,研究了波束域高分辨方位估计的MUSIC方法。首先分析了波束形成方法获得处理增益的原理,揭示了波束域高分辨方法具有较低分辨门限的机理;给出了波束域高分辨MUSIC算法,通过计算机仿真,比较了波束域和阵元域高分辨MUSIC法的统计性能,显示了波束域高分辨方法的优越性;进行了消声水池实验,结果表明波束域高分辨MUSIC法分辨力高,对阵列误差具有较大的宽容性。

This paper studies beam-space MUSIC for direction-of-arrival estimation of underwater targets. First, the signal to noise ratio gain of beam forming is introduced. Using the gain of beam forming, we explain why the signal to noise ratio threshold of beam-space high resolution algorithm is lower than that of element space algorithm in the same conditions. Then the beam-space MUSIC is presented, and followed by statistical simulation. The performance of the beam-space algorithm is contrasted with the element space algorithm in terms of the resolution probability and mean square error. At last, experiments are carried out in a water tank. Experimental results show that the beam-space MUSIC algorithm has high resolution ability and can bear preferably with array modeling errors.