浅海环境参数失配对匹配场处理的影响分析

摘要

The acoustic field is readily changed with the spatio-temporal variability which can be caused by the hypsography,season and other factors,so it is very complex in shallow water.The characteristic of the field severely reduces the robustness of the matched field processing.In order to improve the matched field passive localization,itis necessary to identify the main factor which causes the decrease.So the common matched field processing was adopted on the basis of the normal mode.The performance of mismatch in water depth,water sound speed profile and sediment layer parameters were compared by several parameters,such as source position estimation error,-3dB main lobe width,array spectral degradation,ect.The results show that the water depth mismatch is the most sensitive parameter,the water sound speed profile mismatch is less than the former,and the mismatch in sediment layer parameters is the minimum one.%关于海底声波优化定位问题,浅海环境由于地形、季节等因素的影响,使得声场具有复杂的时变、空变特性,严重制约了匹配场处理的稳健性.为了给改善匹配场被动定位提供理论依据,有必要找出影响匹配场处理稳健性的主要因素.在简正波模型的基础上,采用常规匹配场处理进行了仿真.通过对比定位结果的声源位置估计偏差、-3dB主瓣宽度、阵的输出谱能量降低等参数,对深度失配、水中声速失配和基底参数失配进行了分析.结果表明深度失配对匹配场处理的影响最大,水中声速失配的影响次之,基底参数的影响最小.