吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (6): 1847-1854.doi: 10.13278/j.cnki.jjuese.201606303
石秀林, 孙建国, 孙辉, 刘明忱, 刘志强, 黄兴国
Shi Xiulin, Sun Jianguo, Sun Hui, Liu Mingchen, Liu Zhiqiang, Huang Xingguo
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。
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