声纳输出的弱目标信息提取方法仿真分析

针对存在艇外平台强干扰的情况,对波束域MVDR（b-MVDR）和后置波束形成干扰抵消器（PIC）的弱目标提取能力进行了仿真分析。考虑到艇外平台与目标往往处于同一波束的实际情况,提出首先采用密集波束形成,再进行弱目标提取的方法。仿真结果表明：对艇外平台与目标处于同一波束的情况,PIC的目标分辨能力更强;在干扰较强时,PIC方法表现出更强的弱目标提取能力,但随信干比的增加其能力不断降低;而b-MVDR方法则在各种信干比下均具有良好的性能。

Simulative analysis of extracting weak target information from sonar outputs

In many cases the outside-ship-platform becomes strongly jammed,which makes the ship's sonar hard to detect weak targets.Two methods for extracting weak target information from sonar outputs,the beamspace MVDR (b-MVDR) and the post-beamformer interference canceller (PIC),are analyzed through computer simulations.And simulation results show that the PIC has the improved resolution performance over the b-MVDR,but the PIC's capability to extract weak target decreases as the signal-to-interference ratio (SIR) i...