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

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。

Abstract:

In order to apply the space-time adaptive processing (STAP) theory to the underwater environment and improvethe performance of reverberation suppression in moving sonar, the influence of Doppler in the on STAP of moving sonarwas studied. Firstly, according to the STAP process, the influence of Doppler on the matched filter and the space-timesteering 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 ofthe matched filter. The correction of the space-time vector could improve the accuracy of the estimation of target directionand improve the reverberation suppression ability.