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1·Discuss the case where there might be defects in line-of-sight propagation caused by mountainous areas.

会商在视距传布(用户之间直线传布无线电)会发生缺陷的山区中的状况。

2·Discuss the case where there might be defects in line-of-sight propagation caused by mountainous areas.

在由于山区引起信号传播的阻碍的地区，讨论这样的情形。

3·The method is especially useful when line-of-sight clearance cannot be obtained above the surface of the earth for the propagation path.

这种方法在传播路上对不能在地表面上获得视线余隙时特别有用。

4·Four propagation models of diffraction, line-of-sight, scatting and duct are analyzed. The basic transmission loss for each of the models is calculated according to the ITU-R model and GZB model.

分析了电波的地波绕射传播、视距传播、散射传播和波导传播等四种传播模式，根据ITU - R和GZB建议的模型分别计算了各传播模式的基本传输损耗。

5·Based on the assumption of single-scattering, atmospheric propagation model of non-line-of-sight optical scattering communication system is studied.

利用大气对光的散射作用可以实现非视线通信。在单次散射假定下，研究了非视线光散射通信系统的大气传输模型。