Space-time Optimum Processing for Acoustic Homing System in Reverberation Background
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摘要: 混响是鱼雷主动自导背景干扰的一部分，也是限制鱼雷自导主动检测目标的主要因素。浅海环境下，海底和海面的界面混响干扰尤为严重，直接影响鱼雷主动回波信号的目标检测结果。本文针对不同入射角度混响多普勒变化，分析了自导系统在运动过程中接收混响信号的空时2D特性,研究了空时2D功率谱的实现方法。通过仿真分析最优处理器的2D频响输出和最优处理器的输入输出信混比，证明了该方法抑制混响的有效性,同时研究了空时自适应处理技术的评判标准，分析了阵元数变化对最优处理器改善因子的影响。Abstract: Reverberation is the main background noise of the torpedo active sonar, which limits active sonar target detection in the shallow sea. Space-time two-dimensional spectrum characteristic of receipting reverberation signal for homing system in the motion process are analyzed based on the reverberation Doppler variation at different angles of incidence. Optimum space-time processing and the evaluation method are also analyzed. The validity of this method is verified by the simulation output of the processor, the judgment criterions of space-time adaptive process technology are discussed, and the influence of the variation of array element number on the improvement factor of the optimum processor is analyzed.
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