北太平洋水下脉冲声传播仿真

Simulation of Pulse Sound Propagation in the North Pacific Ocean

由于信号波形中携带环境参数信息,可利用波形或包络结构反演环境参数,掌握信号波形的传输规律是实现信道匹配的物理基础。将WKBZ简正波方法用于水下声道中的脉冲传播波形的计算、群速的求解。并仿真了窄带脉冲在北太平洋水下声道中的传播波形,仿真结果反映出了明显的信号传输的多途效应。分析了简正波群速对脉冲波形的影响,在收发深度均位于声道轴上时,在远距离上实现了简正波的分离;同时分析了收发深度与简正波幅度的关系及对脉冲波形的影响,得出在某一深度不是所有简正波对脉冲波形有贡献的结论。

For the waveform signal carrys environmental information,the waveform or its envelope could be used to inverse the environmental information. Mastering the transmission characteristics of the waveform signal is the physical base to channel match. WKBZ normal mode approach has been applied to compute the waveform of pusle propagation and group velocity. The waveform of impulsive sound propagation in the North Pacific Ocean channels is simulated. The simulation results show the obvious multi - path effect. The influence of group velocity on the waveform is analyzed. When source and receiver are all on the depth of axial channel , the normal mode could be separated in the long - distance. This paper also analyzes the relation between the depth of source and receiver and the amplitude of normal mode and the effect on the waveform, and comes to the conclusion that only a few normal mode contributes to the waveform.