运动声呐空时自适应处理中的多普勒影响分析  

Doppler Effect Analysis for Modified Space-Time Adaptive Processing in Moving Sonar

作　　者：李娜[1,2] 施博 郝程鹏[1] LI Na;SHI Bo;HAO Chengpeng(The Institude of Acoustics of the Chinense Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

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,北京100049

出　　处：《海军航空工程学院学报》2018年第1期106-110,共5页Journal of Naval Aeronautical and Astronautical University

基　　金：国家自然基金资助项目(61571434);中科院声学所青年英才计划基金资助项目(QNYC201623)

摘　　要：为了将空时自适应处理(STAP)理论更好地应用于水下环境,提高运动声呐对混响的抑制性能,研究了多普勒对运动声呐STAP的影响。具体分析了由多普勒造成的回波脉宽伸缩变换以及目标空时导向向量失配带来的影响。分析结果表明,回波包络脉宽变化对于匹配滤波输出信噪比影响较小,而对空时导向向量修正可以有效提高目标方位估计精度以及混响抑制能力。In order to apply the space-time adaptive processing(STAP)theory to the underwater environment and improve the performance of reverberation suppression in moving sonar,the influence of Doppler in the on STAP of moving sonar was studied.Firstly,according to the STAP process,the influence of Doppler on the matched filter and the space-time steering vector was found.Then,specifically analyzing pulse width variation of echo and the mismatch of steering vector.The simulation results showed that the change of the echo envelope had little effect on the output signal-to-noise ratio of the matched filter.The correction of the space-time vector could improve the accuracy of the estimation of target direction and improve the reverberation suppression ability.

关 键 词：空时自适应处理 多普勒效应 包络 修正项 混响 

分 类 号：TN957.51[电子电信—信号与信息处理]