混响背景下的声自导系统空时最优处理

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。

Space-time Optimum Processing for Acoustic Homing System in Reverberation Background

Reverberation is the main background noise of the torpedo active sonar,which limits active sonar target de-tection 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 proc-essor is analyzed.