基于MVDR聚焦波束形成的辐射噪声源近场定位方法

为全面刻画噪声源的空间分布,需同时对辐射噪声中的宽带及窄带线谱信号进行聚焦波束形成.研究可应用于水下辐射噪声源定位的基于最小方差信号无畸变响应(MV-DR)的聚焦波束形成方法,将MVDR方位估计方法与聚焦波束形成相融合,较常规聚焦波束形成具有更高的分辨率和更低的旁瓣级,并能减小"混叠"效应的影响.仿真和实验均证明了该方法的正确性和有效性.

Radiated noise sources near-field location based on MVDR focused beamforming

Both broadband signal and narrowband signal can fully describe the spatial distribution of the radiated noise sources.The near-field focused beamforming method based on minimum variance distortionless response(MVDR) was proposed,which may be used in underwater radiated noise source locating,meantime,the MVDR-based bearing estimation was fused with focused beamforming.Compared with conventional methods,the proposed method has higher resolution and lower side-lobe level,while the impact of the aliasing was reduced.Both simulations and experiments verify the validity and efficiency of the proposed method.