基于微波射线传播基本理论,结合我国距地面高度100米以下低空折射率梯度分布模型,计算出分布在29个省、市、自治区的59个台站点,时间百分数为0.1％和99.9％时相对于50％值的单位路径长度上射线到达角的变化范围。给出了以等效地球半径系数为参变量的平地电路射线到达角变化值与距离的关系曲线。为地面微波线路系统提供了设计依据。 Based on the basic theory of microwave radiation propagation and the low-altitude gradient distribution model of low altitude above 100 meters from the ground in China, 59 stations distributed in 29 provinces, municipalities and autonomous regions were calculated, with time percentage of 0.1% and 99.9% The 50% value of the unit path length over the range of ray angle of arrival. The relationship between the change of the ray angle of arrival and the distance of the ground circuit with the equivalent earth radius coefficient as the parameter is given. For the ground microwave line system provides a design basis.