电波传播混合路径循迹的算法研究

Research on Hybrid Path Tracking Algorithm in Ray Tracing Techniques

为快速准确预测基站周边环境中辐射场强,提出了射线跟踪技术中混合路径的反射点、绕射点算法.给出了求镜像点与镜像线的通用公式,提出了多次反射路径中反射点算法.推出了多次绕射路径中绕射点算法的优化公式.提出将混合型路径中反射及绕射进行适当的变换,从而实现混合路径转换成绕射路径的算法.最后将该算法运用于z-缓存区改进算法中,对一个通信基站周边环境中的射线传播路径进行跟踪,并对场强进行计算,计算结果与实测值非常吻合.

A quick accurate algorithm for reflection points and diffraction points in hybrid paths, as a ray-tracing technique, was put forward, for forecasting station surrounding environment radiation field intensity. With a general formula for mirror image points and image lines, an algorithm for reflection points in muhihop paths was presented. An optimization formula for diffraction points in multiple diffraction path algorithm was introduced. By proper transformation between reflection and diffraction in hybrid paths, the algorithm which transform hybrid paths into diffraction paths was implemented. Finally, the proposed algorithm was applied to improve the z-buffer algorithm, the ray propagation path was tracked and field strength was calculated in the surrounding environment around a communication base station. The numerical results from the algorithm are in good agreement with the measured values.