The coherence bandwidth of shortwave channel is calculated by using the density profile and wave propagation features in ionosphere.
从该电子密度模式和电离层波传播特性出发确定多径分量，计算短波信道相干带宽。
The global /shortwave/ propagation familiar to use of lower frequencies is unknown at UHF.
全球/短波传播熟悉使用较低的频率在超高频是未知的。
Firstly, this paper presents an improved prediction method of maximum usable frequency (MUF) of skywave propagation based on the analysis of the current shortwave frequency prediction method.
在对当前短波频率预测方法进行分析的基础上，提出了一种天波传播最大可用频率预测的改进方法。
The frequency prediction of skywave propagation in shortwave band is the precondition of performance prediction of skywave communication circuit.
短波天波传播频率预测是短波天波通信电路性能预测的前提。
People show great interest in shortwave communication for its special merits such as flexibility, not easily be destroyed and long propagation distance.
短波通信以其机动灵活、抗毁性强、通信距离远等特殊的优点重新引起人们的研究兴趣。
People show great interest in shortwave communication for its special merits such as flexibility, not easily be destroyed and long propagation distance.
短波通信以其机动灵活、抗毁性强、通信距离远等特殊的优点重新引起人们的研究兴趣。
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