高仰角对流层散射电波传播损耗的一种预计方法

A prediction method of the troposcatter transmission loss with high elevation

偏远山区应急通信需通过无线传输手段解决。由于山峰等障碍物对无线电波的阻挡,使得微波、超短波等通信手段应用受到限制。对流层散射具有跨越一定障碍物的通信能力,有可能用于山区中通信。传统散射使用条件是基于低仰角,本文主要讨论了高仰角、近距离情况对流层电波传播损耗,通过大量实际线路测量和理论分析,验证了散射通信用于跨越近距离障碍物的可行性,在现有散射传输损耗预计模式的基础上给出了一种与实测数据较为吻合的高仰角散射传播损耗预计方法。

Radio method is applied to solve the problem of the emergency communi- cation in mountainous area. since the microwave and VHF communication are restricted due to the obstructions as mountains. Because troposeatter communication has the ability of crossing over obstructions, it is possible to be used in mountainous area communication. The traditional application condition is commonly based on low elevation, but in this paper, the transmission loss of the troposeatter radio wave is mainly discussed in the case of high elevation. Through practical measure to many communication links and theoretical analysis, it is proved that the tropocatter communication can be applied in crossing obstructions, and a calculating method of the troposcatter transmission with high elevation loss is given on the basis of existing prediction models of troposcatter transmission loss. The resuhs predicted by this method agree well with the practical data.