一种改善逆波束形成显示效果的方法  

An improved method to enhance the display effect of inverse beam-forming

作　　者：郑恩明[1,2] 陈新华[1] 孙长瑜[1] 余华兵[1] 

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100190

出　　处：《应用声学》2013年第5期388-394,共7页Journal of Applied Acoustics

基　　金：国家海洋公益性行业科研专项经费项目(201005001)资助课题

摘　　要：在低信噪比条件下,由于协方差矩阵中主对角元素相比其他元素所含噪声能量大,致使逆波束形成(IBF)所得空间谱中目标方位处能量与其他方位处能量差别小、显示效果不好。对此,本文采用对协方差矩阵主对角元素进行修正法来降低噪声对IBF的影响,扩大目标方位与其他方位处能量差别,改善空间谱显示效果。Matlab数值仿真和湖试数据处理结果均表明:在低信噪比条件下,本方法可改善IBF所得空间谱的显示效果。本方法简单有效,可满足实际工程应用,为改善方位历程显示效果提供一个参考。In the condition of lower signal-to-noise ratio （SNR）, because the main diagonal elements contains more noise than other elements in covariance matrix, the energy difference between the target area and others area is small in spatial spectrum of inverse beam-forming （IBF）, and the display effect of spatial spectrum is not desirable. In this paper, we corrected the main diagonal elements of covariance matrix to reduce the noise impact on IBF, enlarge the energy difference between the target area and others area, and improve display effect of space spectrum. Matlab numerical simulation and processed results of lake data show that this method can improve display effect of space spectrum for IBF in lower SNR. The method is simple and effective, and suitable for the practical application, and provides an alternative method for improving time/bearing display effect.

关 键 词：信息处理技术 逆波束形成 主对角元素修正 显示效果 

分 类 号：TB565[交通运输工程—水声工程]