近场MVDR聚焦波束扫描声图定位方法研究

Research on the Passive Location of Near Field Using Underwater Acoustic Image with MVDR Focused Beam-forming

声图测量技术是一种适用于近场的高精度被动定位技术,可以用来测量舰船辐射噪声源位置的空间分布。声图测量的核心算法是聚焦波束形成。算法的分辨力与阵长、信号处理频段以及目标距离有关。当阵长一定、测量区范围给定时,算法对低频声源的分辨力较差。MVDR波束形成法可较常规波束形成获得更高的分辨力,降低旁瓣。采用MVDR与聚焦波束形成相结合的方法可提高对舰船各部位辐射噪声源的分辨力。

Underwater acoustic image measurement technology can be used in high-precision passive location of near field. It is mainly used to analyze the spatial distribution of naval ship radiated noise sources. The arithmetic of underwater image is focused beam-forming. The resolution of algorithm is concerned with array length, the frequency of signal processing and the range of target. When the array length and measurement range is given, the resolution of low frequency noise sources is poor. MVDR beam-forming algorithm can achieve higher resolution and lower side lobe compared with the conventional algorithm. A method by combination of MVDR and focused beam-forming technology can improve the resolution of naval ship radiated noise sources.