台湾海峡近海水声信道传递函数仿真研究

Simulation Research on Transfer Function for Shallow Water Acoustic Channel of Taiwan Straits

水声信道传递函数特性对水声通信系统的性能有着重要的影响。采用美国海军GDEM(generalized digital environmental model)中全球气候态月平均声速数据,基于BELLHOP射线传播模型,对台湾海峡近海北、中、南部三个站点在不同季节的声速剖面下的传递函数进行了仿真研究。仿真结果表明,台湾海峡近海浅海声信道的传递函数为锯齿状,间断出现子通带。平均子通带宽度与声速剖面和海水的深度的变化密切相关。

The characteristics of transfer function of underwater channel have important impact on performance of underwater communication system. The channel transfer function of three locations in north, middle and south of Taiwan straits were simulated respectively, based on BELLHOP ray model and climatic month mean sound speed profile from GDEM （generalized digital environmental model） of USA Navy. Simulation results indicate that the transfer function of shallow water channel in Taiwan straits appears jagged with sub-passband. Mean width of sub-passband is closely related with the sound speed and depth of water.