有序波前重建法的射线追踪

建立了一种新的计算最小走时和射线路径的方法——有序波前重建法. 文中算法按照波前面的实际扩展顺序外推计算走时，采用以计算点为中心的走时计算策略，直接记录计算点获取最小走时的前一节点坐标，同步计算最小走时和射线路径，得到一种全局算法. 该方法具有原理简单、易于实现、不受介质速度差异大小限制、计算速度快等优点. 数值实验表明有序波前重建法具有较高的计算精度和运行效率.

RAY TRACING USING ORDINAL WAVEFRONT RECONSTRUCTION METHOD

A new method, is presented the ordinal wavefront reconstruction method to calculate minimum traveltimes and ray paths. In the previous traveltime calculation methods the source is taken as center and the calculation is made layer upon layer and step by step. It would result in acquiring half-baked wavefront information. In this paper, the ordinal wavefront reconstruction method is used in calculating minimum traveltimes according to actual wavefront surfaces' order. The calculating strategy is to take calculation point as center. The fore-node coordinate of the minimum traveltimes of the calculating point is logged directly, at the same time, the minimum traveltimes and ray paths are calculated. This is a kind of synchronous global algorithm. This method has its advantages, such as simple principle, easy implementation, no limit by different velocities, and fast computation etc.. The numerical experiments show that the ordinal wavefront reconstruction method has higher calculation precision and running efficiency.