远距离短波通信最低可用频率的计算

短波通信最低可用频率是确定短波通信可用频率范围的重要参量,计算该频率对提高短波跳、扩频通信效能有现实意义。简述了短波通信的概念和特点,介绍了短波天波传播过程中的各种损耗的计算方法,进而利用天波传播损耗公式从理论上对远距离短波通信最低可用频率进行计算。短波最低可用频率的计算有助于短波通信频段的选择。

Calculation of the lowest useable frequency for long distance HF communication

The lowest useable frequency for HF communication is an important parameter for the ascertainment of HF communication useableness spectrum.This frequency calculation has realistic meaning for the improvement of the HF frequency hopping and spread spectrumn communication efficiency.This paper states the conception and characteristic of HF communication,and introduces calculation methods for various losses in skywave transmission process.According to the skywave transmission loss formula,the lowest useable frequency for long distance HF communication is counted in theory.The calculation of the lowest useable frequency for HF communication contributes to the selection of HF communication spectrum.