衰减夹层GPR模拟的时频域全局反射误差
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Release time:2020-08-07 Impact Factor:0.829 DOI number:10.6038/cjg20170327 Affiliation of Author(s):中南大学地球科学与信息物理学院 Teaching and Research Group:中南大学应用地球物理系 Journal:地球物理学报 Place of Publication:中国 Key Words:探地雷达；数值模拟；衰减夹层；时间域反射误差；频率域反射误差；全局反射误差 Abstract:全局反射误差分析是深入研究探地雷达（GPR）吸收边界条件吸收效率的有力工具．基于常规完全匹配层（PML）的标准交错网格有限差分算法必须满足严格的CFL条件限制，即在单位时间步长内，不容许电磁波传播的距离超过单元网格尺寸．为了提高主区域所有网格节点的计算效率，并有效地吸收传播后期出现的低频隐失波，提出基于非分裂递归卷积完全匹配层（UCPML）的旋转交错网格（RSG）GPR正演算法．该算法采用不同的网格交错策略，并在边界条件中引入了吸收低频隐失波的自由可变因子，使得该算法允许选取较大的时间步长，提高了计算效率，并且实现了对低频隐失波的高效吸收．本文首先给出了RSG差分格式，推导了基于UCPMI，的RSG差分更新方程，探讨了数值色散的稳定性条件，然后以绕射现象严重的衰减夹层数值模拟为例，分别从波场快照、单道波记录、时间域反射误差（TDRE）、频率域反射误差（FDRE）四个方面分析了UCPML与常规PML的全局反射误差，说明了基于UCPML和RSG的GPR正演算法能更有效地吸收低频隐失波． Co-author:戴前伟, 尹小波, 冯德山 First Author:张彬 Indexed by:Applied Research Document Code:DOI：10.6038/cjg20170327 Discipline:地质资源与地质工程 Document Type:J Volume:60 Issue:3 Page Number:1168-1178 ISSN No.:0001-5733 Translation or Not:no CN No.:11-2074/P Date of Publication:2017-03-15 Included Journals:SCI -
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