海洋信道仿真软件HJRAY及其在水声通信中的应用

海洋声信道特性十分复杂，对水声通信信号传输构成严重影响，包括能量衰减、多途扩展以及多普勒频移等。为了具体模拟海洋信道对其中传输的声信号的影响，培出了一个新的海洋信道仿真软件-HJRAY.HJRAY通过对海洋环境中各种物理特性的模拟以及对声线轨迹常微分方程组的解算，合成海洋信道的时变冲激响应，获取通信链路接收水听器端信号，为仿真评估现实信道条件下水声通信系统性能提供基础。结合一个具体的直接序列扩频方案，验证了HJRAY在水声通信仿真中的有效性。

Ocean Acoustic Channel Simulator HJRAY and Its Application on Underwater Communication

The characteristics of the ocean acoustic channel are very complex, which imposes strong limitations on underwater communication transmission, including energy attenuation, multipath propagation and Doppler shift. A new ocean acoustic channel simulator HJRAY was developed to represent all these channel effects. Based on the simulation of the ocean physical phenomena and the calculation of the ray-tracing differential equations, HJRAY synthesizes the time-varying impulse response of the underwater channel, derives the signal at receiver hydrophones, and provides a way to evaluate the performance of underwater communication systems in realistic conditions. Combining with a direct sequence spread spectrum system, its validity in underwater communication simulation was proved.