| 二维速度随机分布逐步迭代射线追踪方法 |
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| 引用本文： | 高尔根,徐果明.二维速度随机分布逐步迭代射线追踪方法[J].地球物理学报,1996,39(Z1):302-308. |
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| 作者姓名： | 高尔根 徐果明 |
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| 作者单位： | 中国科学技术大学地球和空间科学系, 合肥 230026 |
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| 摘 要： | 基于Ｓｎｅｌｌ定理，研究一种新的射线追踪方法──逐步迭代射线追踪法。首先，从一端出发，根据射线路径上任意连续三点均满足Ｓｎｅｌｌ定律，利用一个近似公式逐段迭代，求取中间折射点，从而实现逐步迭代计算。该方法的追踪路径结果符合射线追踪要求，计算速度快，方法精度高，可以克服射线追踪的路径非唯一性；并且在追踪过程中可以给出透射走时，为层析成像方法提供了一种有效的射线追踪过程。
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| 关 键 词： | 射线追踪 走时 射线路径 层析成像 |
| 收稿时间： | 1996-08-19 |
A NEW KIND OF STEP BY STEP ITERATIVE RAY-TRACING METHOD |
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| GAO ER-GEN,Xu Guo-MING.A NEW KIND OF STEP BY STEP ITERATIVE RAY-TRACING METHOD[J].Chinese Journal of Geophysics,1996,39(Z1):302-308. |
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| Authors: | GAO ER-GEN Xu Guo-MING |
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| Institution: | Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | A new kind of ray-tracing method──step by step iterative ray-tracing method based on the law of Snell refraction is studied in this paper.According to the fact that any sequence of three points observes the law of Snell refraction,the calculation starts from one end and the middle refraction point is obtained through approximate formula.Finally,the step by step iterative calculation is completed. Numerical tests based on this method show that it contents with the request of ray-tracing.The algorithm is two times faster than traditional shooting method for random velocity distribution in two dimensional medium and the results are accurate enough Non-uniqueness of ray path Is resloved. At the mean time, travel time of transmitted wave can be given in the procedure of ray-tracing.It offers a new kind of efficient ray-tracing method for tomographp. |
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| Keywords: | Ray tracing Travel time Ray path Tomography |
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