水声阵列信号处理对角减载技术  

The technique of diagonal reduction processed with underwater acoustic array signal

作　　者：赵安邦 周彬 宋雪晶 毕雪洁 

机构地区：[1]哈尔滨工程大学水声技术重点实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2014年第11期1327-1331,共5页Journal of Harbin Engineering University

基　　金：海洋公益性行业科研专项经费资助项目(gz201005001);国家自然科学基金青年基金资助项目(51009041);国家自然科学基金资助项目(11374072;61371171)

摘　　要：针对独立高斯白噪声背景和多个平面波干扰,尤其是低输入信噪比的情况,提出一种基于阵列信号协方差矩阵对角减载的波束形成技术。通过足够多次快拍的估计,得到接收信号稳定的协方差矩阵,对协方差矩阵进行适量的对角减载能提高阵列输出增益以及多目标的分辨能力。对基于对角减载的常规波束形成和最小方差无畸变波束形成器的阵列增益进行了仿真,分析了阵列增益随减载系数的变化关系,并研究了多目标分辨时对角减载系数的取值区间,最后仿真验证了对角减载技术提高MVDR多目标分辨能力的有效性。A beamforming method based on array signal covariance matrix diagonal reduction is proposed. By estimating enough snapshots, a stable covariance matrix of the received signal is obtained. Through the approprivte covariance matrix diagonal reduction, the array output gain and the multi-target resolving ability can be improved. In this paper, the conventional beamforming （CBF） and minimum variance distortionless response （MVDR） beamformer＇s array gains were deduced and simulated based on diagonal reduction. The relationship between the array gain and reduction coefficient is analyzed and the reduction coefficient range for resolving multiple targets is stadied. The results showed that the diagonal reduction method can improve the multi-target resolving ability of MVDR effectively.

关 键 词：对角减载 多目标分辨 阵列增益 最小方差无畸变响应 常规波束形成 阵列信号 

分 类 号：U666.7[交通运输工程—船舶及航道工程]