一种基于模态强度筛选的水面干扰抑制方法  

A Method of Water Surface Interference Suppression Based on Modal Intensity Selection

作　　者：李文哲[1] 付留芳 LI Wenzhe;FU Liufang(Anti Submarine Teaching and Research Section of Water and Chemical Defense Department,Dalian Naval Academy,Dalian 116018)

机构地区：[1]海军大连舰艇学院水武与防化系反潜教研室,大连116018

出　　处：《舰船电子工程》2018年第11期151-155,共5页Ship Electronic Engineering

基　　金：国家安全重大基础研究项目(编号:613220)资助

摘　　要：在浅海环境中,水面离散强干扰严重影响水下目标的远程预警探测。理论上,浅海常见的负梯度声速剖面下,水面声源和水下声源激发的简正波模态具有明显差异性。基于模波束形成方法,通过对声源激发简正波模态强度的筛选,对水面干扰进行抑制。仿真表明:模态强度筛选能够通过对水面干扰激发的模态强度的剔除,抑制水面干扰,但定位精度不高;快拍数的增加和声源激发模态数的增多均有利于提高水下目标定位精度,且快拍数增加对于提高分辨率效果更为显著。In shallow water, the discrete surface interferences would seriously affect the long-range forewarning and detection of underwater targets. Theoretically-, the sources of surface and underwater have very different NM （normal mode） modes. The surface interference is suppressed based on modal intensity selection with MMP（Matched Mode Processing）. The simulation shows that modal intensity selection can suppress the surface interference effectively through rejecting the modes excited by surface sources, but the location accuracy is poor. What＇s more, the increase of snaps and modes excited by the source can improve the location accuracy of the underwater targets, and the increase is more beneficial for improving the location accuracy.

关 键 词：水面干扰抑制 模态强度分布 匹配模定位 浅海环境 

分 类 号：TB565[交通运输工程—水声工程]