几何绕射理论应用中的后向射线跟踪问题

The Problem of Backward Ray Tracing in Geometrical Theory of Diffraction Applications

讨论了几何绕射理论应用中后向射线跟踪问题，给出了平面反射射线、曲面绕射射线、边缘绕射射线、曲面绕射－平面反射射线和曲面绕射－边缘绕射射线的跟踪方法，讨论了相关射线的遮挡问题，并且用该方法进行了实例计算。

The backward ray tracing in Geometrical Theory of Diffraction (GTD) applications is discussed. The tracing method of plane reflection rays, smooth convex surface diffraction rays, edge diffraction rays, smooth convex surface diffraction plane reflection rays and smooth convex surface diffraction edge diffraction rays are given. The method to determine rays′ obstruction by objects is also discussed. Some computation examples are given to show that our method can be used in GTD computations.