单个压差式矢量水听器MVDR波束形成的优化研究

Optimization for MVDR beamforming based on single pressure gradient vector hydrophone

从矢量水听器和声压阵两个角度,研究了单个二维压差式矢量水听器的最小方差无失真响应(minimum variance distortionless response,MVDR)波束形成的优化技术。针对压差式矢量水听器半径波长比大于0.1时,利用它进行方位估计性能恶化的问题,提出了一种修正的单个压差式矢量水听器MVDR波束形成处理方法。仿真和湖上试验的结果表明:修正的压差式矢量水听器MVDR处理方法对阵元间距的变化具有更好的稳健性;在半径波长比小于0.1时具有更好的估计性能,在半径波长比大于0.1的一定范围内依然具有良好的方位估计能力。

The optimization technique of the minimum variance distortionless response （MVDR） beamform ing based on single two-dimension pressure gradient vector hydrophone is studied from the aspects of vector hy drophone and pressure sensors array. When the radius to wavelength ratio is more than 0.1, the direction of ar rival （DO.A） estimation performance of the pressure gradient hydrophone becomes worse. For improving this, a modified MVDR beamforming approach based on single pressure gradient vector hydrophone （MVMVDR） is proposed. The simulation and lake trial results indicate the MVMVDR approach has better robustness to the variation of the radius; it has better DOA estimation performance than original approaches when the radius to wave length ratio is equal or lesser than 0.1, and it is still valid when the radius to wavelength ratio is more than 0.1.