近场聚焦波束形成低频段精确定位方法

摘要

近场聚焦波束形成声图测量方法可以实现舰船高频信号的主要噪声源的精确定位,实验证明在正横位置时的定位精度可小于2 m.但对于低频、线谱等信号,近场聚焦波束形成声图测量方法由于受阵元间距、基阵孔径等多方面影响,无法实现精确定位.本文提出采用高精度频域MVDR聚焦波束形成声图测量方法,实现频率大于200 Hz舰船目标定位.经理论仿真与实际信号分析,该方法可以实现低频信号的高精度定位,定位精度明显优于常规波束形成(CBF).%Focused beam-forming method on near field can realize precision location of high-frequence principle noise source on warship. Location precision on the abeam may less than 2 metres by test proved. Being influenced by array-interval and basic-aperture, this method can't realize precision location to low-frequency and line spectrum signal. This thesis presents MVDR focused beam-forming on frequency domain that can realize high-precison location of low-frequency signal, which overmatch CBF on location precision apparently.