基于主动时反的浅海目标DOA估计优化算法

摘要

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 mul-tipath DOA estimation model based on uniform line array and the ATR-based DOA estimation model are set up re-spectively. The Capon algorithm is employed to simulate the models and compare it with conventional one. The sim-ulation 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.%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.