基于改进的双线性旅行时插值的三维射线追踪  

THE 3D RAY TRACING METHOD BASE ON THE IMPROVED BILINEAR TRAVELTIME INTERPOLATION

作　　者：梅胜全[1] 邓飞[1] 钟本善[1] 周熙襄[1] 

机构地区：[1]成都理工大学信息工程学院,四川成都610059

出　　处：《物探化探计算技术》2010年第2期152-157,108-109,共6页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国核工业地质局地勘资金项目资助(200661)

摘　　要：旅行时射线追踪的精度和效率一直是影响地震层析成像质量和效果的关键因素。这里在三维近地表速度结构层析成像应用中,结合旅行时插值算法与最短路径算法,提出了一种三维初至波射线追踪算法。通过对双线性旅行时插值算法进行改进,并运用判定条件与简化插值计算公式进行快速计算,减少了插值次数,降低了运算量,同时也保证了较高的射线精度,有效地解决了三维射线追踪算法的计算低效率,射线精度不高的问题。The accuracy and efficiency of travel time ray tracing is always the key factor of affecting the quality and effect of seismic tomography. In this paper, an improved 3D ray tracing algorithm is presented to solve this problems, and the algorithm is based on the near-surface three-dimensional tomography in the practical application combining with bilinear interpolation algorithm and the shortest path algorithm. Through improved the linear interpolation ray tracing traveltime algorithm by determining the conditions and simplify the formula and the evolution of the grid extension to the spread of wave front, the interpolation times have been deduced and the computing amount have also been reduced. The algorithm guarantee the accuracy of ray tracing and achieve an efficient and fast ray tracing.

关 键 词：线性旅行插值 射线追踪 网格剖分 初至波旅行时 

分 类 号：P631.443[天文地球—地质矿产勘探]