中文摘要：

针对现有超短波信道的路径损耗模型对环境细节针对性差的问题,在电子地图已知的条件下,提出了基于布朗桥理论的超短波信道路径损耗模型。该模型应用布朗桥理论产生随机射线,经过环境散射物模型对随机射线的有效筛选,从概率意义上得到了超短波路径损耗模型。仿真结果表明,从与经验公式的对比结果和直射分量占总能量的百分比情况,该模型能够有效反映信道环境对超短波路径损耗的细节影响效果。

英文摘要：

Aiming at the weakness that the current path loss model of the VHF channel does not consider the details of the channel environment＇s effect and the poor adaptability of the environment, a new VHF channel path loss model based on the theory of Brownian bridge was put forward on condition of the known electronic map. The establishment of an environment scattering model was built. Random rays were generated using the theory of the free Brownian bridge. According to the screening of the environment scatters＇ model, effective paths were screened which reflected the VHF propagation characteristics, and the path loss model of VHF channel was obtained in the view of probability. The simulation results showed that the path loss model could reflect the detailed effect of VHF channel under the results of the comparison with the empirical formula and the percentage of the direct component of total energy.