基于主动时反的浅海目标DOA估计优化算法  

Optimization Algorithm for DOA Estimation of a Shallow Sea Target Based on Active Time Reversal

作　　者：荆海霞[1,2] 王海燕[1] 刘郑国[3] 申晓红[1] 张之琛 Jing Haixia;Wang Haiyan;Liu Zhengguo;Shen Xiaohong;Zhang Zhichen(School of Marine Science and Technology,Northwestern Polytechnic University,Xi′an 710072,China;School of Engineering,Xi'an International University,Xi′an 710077,China;China Shipbuilding Industry Corporation,Beijing,100097,China)

机构地区：[1]西北工业大学航海学院,陕西西安710072 [2]西安外事学院工学院,陕西西安710077 [3]中国船舶重工集团公司办公厅,北京100097

出　　处：《西北工业大学学报》2018年第2期270-275,共6页Journal of Northwestern Polytechnical University

基　　金：国家重点研发计划资助(2016YF01400200);国家自然科学基金(61571365;61571367;61671386);陕西省教育厅科研项目(16JK2173)资助

摘　　要：将时反技术应用到浅海目标DOA估计中,提出基于主动时间反转(active time reversal,ATR)的浅海目标DOA估计优化方法,可有效解决多径、低信噪比条件下的目标DOA估计问题。采用经典射线模型,结合阵列信号处理理论,建立了基于均匀线列阵的常规多径DOA估计模型和主动时反多径DOA估计模型,利用Capon算法对所建模型进行了仿真验证,并做了对比分析。仿真结果表明:在低信噪比情况下,主动时反方法可以更好地估计出目标的角度,其分辨率更高,抑制旁瓣的能力更强。Time reversal technique is applied to the DOA estimation of a shallow sea target,and a method based on active time reversal(ATR)is proposed to achieve correct estimation under multipath and low signal-to-noise(SNR)conditions.Combining the classical ray theory with array signal processing theory,the conventional multipath DOA estimation model based on uniform line array and the ATR-based DOA estimation model are set up respectively.The Capon algorithm is employed to simulate the models and compare it with conventional one.The simulation results show that the ATR-based estimation model can better estimate the azimuth angle of the target than the conventional counterpart,provide higher resolution and better suppress side lobes with the same signal-to-noise ratio(SNR),especially the low SNR.

关 键 词：DOA 估计 优化 算法 目标 模型 信噪比 主动时间反转 均匀线列阵 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]