基于波前构建法的时间域深度偏移——delta波包途径

发布时间：2018-04-30 11:52

本文选题：delta波包 + 波前构建　；参考：《吉林大学学报(地球科学版)》2016年06期

【摘要】：作为一种基于射线的局部瞬态场,delta波包源自高斯波束,是高斯波束在时空域的对偶表示,具有高斯波束的全部优点和缺陷。基于delta波包叠加的时间域深度偏移,当射线穿过高速岩体时,受折射效应影响,密度降低,进而导致delta波包的分布密度降低,使成像质量变差,甚至无法成像。为了弥补这个缺陷,本文采用波前构建法计算射线路径。波前构建法能够以插入射线的方式保证均匀的射线分布,从而保证delta波包以均匀的分布密度覆盖整个成像靶区,进而提高成像质量。在具体实现上,采用链表结构替代以往使用的数组结构。Sigsbee 2A模型的数值试算表明,利用波前构建法可以改善高速体下方区域的成像质量,而利用链表存储波前信息要比利用数组至少节省9%的CPU耗时。
[Abstract]:As a locally transient ray-based delta wave packet derived from Gao Si beam, it is a dual representation of Gao Si beam in time and space domain, and has all the advantages and disadvantages of Gao Si beam. Based on the time-domain depth migration of delta wave packet stack, when the ray passes through the high-speed rock mass, the density is decreased due to the effect of refraction, which leads to the decrease of the distribution density of the delta wave packet, which makes the imaging quality worse, or even cannot be imaged. In order to remedy this defect, the ray path is calculated by the wavefront construction method. The wavefront construction method can guarantee the uniform ray distribution by inserting ray, thus ensure that the delta wave packet covers the whole imaging target area with uniform distribution density, thus improving the imaging quality. In practical implementation, the linked list structure is used instead of the numerical trial table of the array structure. Sigsbee 2A model used in the past. The imaging quality of the region below the high-speed body can be improved by using the wavefront construction method. Using linked lists to store wavefront information saves at least 9% more CPU time than using arrays.
【作者单位】：吉林大学地球探测科学与技术学院;
【基金】：国家自然科学基金项目(41274120,41404085,41504084) 国家科技专项项目(Sinoprobe 09-01)~~
【分类号】：P631.4

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