In this paper, a simulation method for HF communication system based on OPNET is presented. The electromagnetic environment is simulated by introducing the measured propagation loss and the local background noise. When SNR curve of modulator was adopted,the performance of system BER is simulated accurately. In this way the more details of physical layer are displayed. Finally,an algorithm about selecting frequency of HF was implemented in this platform. Applied in engineering, the measured results coincide with the simulation results perfectly, so and prove the effectiveness of the simulation method.%提出了一种基于OPNET的短波通信系统仿真方法.该方法通过引入实测的电波传播损耗以及本地背景噪声实现了对电磁环境的仿真；通过引入调制解调器的信噪比仿真曲线实现了对系统误码性能的仿真,两者结合形成了系统物理层仿真基础平台.采用这种方法搭建的仿真平台,能较真实地模拟物理层特性,弥补OPNET的不足.在该仿真平台上,指导实现了1种短波最佳通信频率选择算法.经过实测,算法仿真结果与实测结果吻合较好,间接证明了系统仿真的有效性.
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