基于柱坐标系抛物方程和矩量法的电波传播混合算法

Hybrid algorithm of radio wave propagation based on parabolic equation in cylindrical coordinates and method of moments

针对包含近源障碍物条件下的电波传播问题,提出了一种新颖的电波传播预测混合建模方法:矩量法(MOM)和圆柱坐标系抛物方程法(PEM)混合建模方法(MOM-PEM);MOM用于包含辐射源和近源障碍物的小圆柱区域内的电波传播建模,PEM用于MOM计算空间外的大区域范围内电波传播建模。MOM和PEM的计算过渡区域进行精细化网格剖分处理以避免场强数值传递的不兼容。仿真模拟了三类近源障碍物存在场景下的电波传播问题:有限开窗屏障碍物、立方体障碍物以及包含辐射源的半封闭空间障碍物,并将混合算法计算得到的结果和相同环境下采用全矩量法计算得到的结果进行了数值对比,结果表明混合算法和矩量法在精度上吻合较好。

In this paper,a novel hybrid modeling method is proposed for radio wave propagation prediction.This method is based on parabolic equation in cylindrical coordinates and method of moments.The method of moments is used to model the radio wave propagation in the small cylindrical region containing the radiation source and the near source obstacle,and the parabolic equation in cylindrical coordinate system is used to model the radio wave propagation in a large region outside method of moments region.The transition surface between method of momenst and parabolic equation is carefully treated to avoid the incompleteness of numerical calculation.The hybrid algorithm proposed in this paper is suitable for predicting the radio wave propagation under various conditions,and it is applied for three different scenarios:the near source region contains a finite windowed obstacle,a finite cube obstacle and a semi-closed cube space obstacle.The calculation results of the hybrid algorithm are compared to those obtained from full method of moment implementations of the same scenarios to verify its accuracy.