射线跟踪技术中场强计算的改进算法  

An improved algorithm on field strength calculation in ray tracing technology

作　　者：周晓平[1] 谭凤杰[1] 柳朝阳[2] 邹澎[1] 

机构地区：[1]郑州大学信息工程学院,河南郑州450052 [2]郑州大学数学系,河南郑州450052

出　　处：《电波科学学报》2013年第4期669-675,691,共8页Chinese Journal of Radio Science

基　　金：环保公益性行业科研专项资助项目(200909106);河南省科技厅项目(No.132102210194)

摘　　要：为减小通信基站附近场强的预测分布与运营后实际分布之间的误差,利用角度缓存区改进算法跟踪射线,提出场强精确算法.通过建立三套坐标系,并考虑通信基站天线下倾角、±45°极化、三瓣花布局等实际因素,推导场强之间的关系.结合天线方向图及波极化面的旋转,计算每条路径场强幅度及相位.对不同路径场强矢量合成,求出精确解.用该算法对两个实例进行计算,结果与实测值误差小于4dB.该算法及程序可用于电磁环境影响评价及场强预测.In order to reduce the errors between the predicted field strength distri-bution and the actual distribution after the operation near the communication base station, a improved algorithm based on the traditional angle buffer algorithm is used to trace rays, and a field strength precise algorithm is put forward. The rela-tion of the field strength is derived, by the establishment of three sets of coordinate systems,and considering the practical factors such as the＂three petals＂ erection lay- out,downtilt,-＋-45~ polarization of the communication base station antennas. Con- sidering antenna pattern and wave polarization plane rotation,amplitude and phase of field strength are calculated for each path. The exact solution is found through vector superposition for the field intensity of different paths. Two examples are cal-culated by using this algorithm, the error between the calculated results and the measured values is less than 4 dB. The algorithm and the program can be used for environmental impact assessment and the electromagnetic field strength prediction.

关 键 词：射线跟踪 一致性绕射 通信基站 射线基坐标系 传播预测 

分 类 号：TN011[电子电信—物理电子学]