反向射线跟踪法中垂直尖劈的绕射算法

The Vertical Wedge Diffraction Algorithms of Inverse Ray-tracing Method

移动通信基站电磁波传播预测是移动通信网络设计的关键课题。射线跟踪法是解决这一问题的有力工具。目前对射线跟踪法的研究大都集中在正向算法,反向算法虽更为精确,但实现过程较为复杂,因而少有涉及。城市建筑物的尖劈可分为垂直尖劈和水平尖劈,本文主要对反向射线跟踪法中的垂直尖劈绕射算法进行了详细研究。首先采用扫描算法求出可见劈表,找出有效传播路径,对每一条路径计算接收点场强,累加得出总的绕射场强。最后通过小区实例,验证计算方法。

The propagation prediction for mobile communication base station is the key problem for the design of mobile communication network.The ray-tracing method is an efficient tool to resolve the problem.Now the ray-tracing researches are mostly concentrated in the direct algorithms.Only a few papers treat about the inverse algorithms,in spite of the more accuracy of inverse algorithms.Because the implementation process is very complicated.The wedge of building can be divided into vertical wedge and horizontal wedge.This paper discusses in detail the vertical wedge diffraction algorithms of inverse ray-tracing method. First,it uses the scanning algorithm to get the visible wedge table,then identifies the effective propagation path,calculates the receiver field strength of each path and accumulates to get the total diffraction field strength.Finally,verify the method through a cell model.