运动声呐海底混响建模及仿真研究

Research on Modeling and Simulating Seafloor Reverberation with the Moving Sonar

在水平不变海洋声道中,基于声源和接收器运动情况下窄带脉冲声传播表达式,导出了收发合置声呐在水平运动情况下的海底混响信号模型。针对模型仿真,提出了一种基于距离-方位角单元结构的混响时间序列仿真方法,该方法能够有效解决时延-多普勒单元内不同模态简正波相关散射系数难以表达的问题,并且实现了任意单元的时延-多普勒间隔小于额定分辨率。仿真结果的功率谱及概率密度分布情况显示了建模及仿真方法的有效性。

Based on the representation of impulsive sound propagation with the moving source and receiver, a seafloor reverberation signal model is derived from the monostatic sonar moving horizontally in horizontally stratified oceans. Then, a method for simulating re- verberation time series is presented with the seafloor divided into range-azimuth cell. It is found that the method can effectively solve the problem that correlated scatter coefficient between different normal modes is difficult to be expressed, and the delay-doppler distance for any cell is less than rated resolution. The power spectrum and the probability density of simulation results show the validity of the modeling and simulation method.