基于高阶累积量的简正波声场匹配场定位效果分析

由于传统情况,匹配场处理器主要针对接收信号为高斯信号,而海洋环境中存在大量的有色噪声,因此设计基于高阶累积量的匹配场处理器具有一定价值。本文介绍了一种在海洋声层析环境下用高阶累积量来降低匹配场处理中高斯有色噪声的算法,对比研究了基于高阶累积量的简正波声场匹配场处理器、传统线性匹配场处理器、自适应匹配场处理器及二阶MUSIC算法匹配场处理器在相同声场环境条件下的匹配场定位效果。研究结果表明,在不考虑参数失配与计算量前提下,接收信号经过基于高阶累积量的简正波声场匹配场处理器后再进行匹配场定位,能有效降低旁瓣,且使用高阶累积量可显著消除海洋传播环境中高斯有色噪声和高斯白噪声对信号的干扰,其匹配效果优于另外三种匹配场处理器。

Analysis About the Effect of Matching Field Location of Normal Wave Sound Field Based on Higher-order Cumulant

In the traditional case,the matching field processor is mainly aimed at the received signal is the Gaussian signal,and there are a lot of colored noise in the marine environment,so the design of matched field processor based on higher-order cumulants is important.This paper introduces an algorithm to reduce Gaussian colored noise in matching field processing by using higher-order cumulants in marine acoustic tomography environment.The matching field localization effects of normal mode sound field processor based on high-order cumulant,traditional linear matched field processor,adaptive matched field processor and second-order MUSIC algorithm matched field processor under the same acoustic field environment are compared and studied.The results illustrate that:without considering the parameter mismatch and the amount of calculation,the received signal is processed by the matching field processor in normal wave sound field,that is based on higher-order cumulant,and then the matched field is located,which can effectively reduce the side lobe.Hence,the high-order cumulants can significantly eliminate the interference of Gaussian colored noise and white Gaussian noise in the ocean propagation environment,and the matching effect is perferable than the other three matched field processors.