干旱区生态环境知识资源中心(Arid): 地质雷达有限差分逆时偏移方法研究

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	地质雷达有限差分逆时偏移方法研究
其他题名	Ground-penetrating radar finite-difference reverse time migration
	鲁兴林; 钱荣毅
来源期刊	地球物理学进展
ISSN	1004-2903
出版年	2017
卷号	32 期号:2 页码:885-890
中文摘要	地质雷达技术是用于研究水文、环境与气候变化等重大科学问题最有效的地球物理技术之一,并广泛应用于检测道路和建筑内部结构,探测冻土层、沙漠沙丘演化特征,进行地质灾害和考古探测等.具有探测速度快、分辨率高和探测结果直观成像的优势.但由于受到介质横向速度变化,孤立块体的绕射波和倾斜界面复杂反射波的影响等,在雷达探测剖面上经常难以真实地反映地下目标体的空间位置和形态.偏移处理技术可以提高成像的真实性.逆时偏移能有效地利用回转波、多次波成像,使反射波准确归位,绕射波完全收敛,是一种受横向变化影响小,倾斜界面成像精度高的偏移方法.本文推导出基于麦克斯韦方程组TM波方程的有限差分格式、稳定性条件和PML边界条件,并编程实现有限差分零偏移距逆时偏移算法.两层模型和空洞模型的逆时偏移剖面与对应的原速度模型完全相同,有效地验证了有限差分零偏移距逆时偏移算法的准确性.相比于两层模型和空洞模型的Kirchhoff偏移剖面,逆时偏移剖面能更有效地提高垂直界面和空洞底界面的成像分辨率,更真实地反映两层模型和空洞模型的空间形态和内部结构信息.
英文摘要	Ground-penetrating radar (GPR) is one most effectively technology of researching some unify scientific problem, such as hydrology, environment, climate change, disaster and archaeology etc. It can detect engineering construction, road, building internal structure, permafrost layer and internal structure of desert. It has some advantages, including rapid detection, higher resolution and directly-vision imaging. However, Due to have influence on the change of lateral radar velocity, the diffraction of isolated block, it ’ s difficult to effectively reflect the inner fine structure at subsurface from GPR section. The process of migration can improve the resolution. Combined with traditional Kirchhoff migration, reverse time migration (RTM) can effectively use reverse branch wave and multiple-wave to image subsurface,make the underground reflection point information back to properly position reflections,and the reflection wave simultaneously, the diffraction wave automatic convergence,which can adapt to medium of lateral velocity changes and high resolution for imaging to dip interface. In this paper, we deduced the finite-difference scheme of TM wave equation from Maxwell’ s equations, stability and PML boundary condition. The result of RTM imaging of two layers model and cavitas model are same with the original their velocity model,respectively,which can demonstrate the accurate of the finite-difference zero-offset RTM algorithm. Combined with Kirchhoff migration section of two layers model and cavitas model, RTM sections can more effectively improve the resolution of the vertical interface and bottom boundary of cavitas,and can more really reflect the space position and inner structure of two layers model and cavitas model.
中文关键词	地质雷达 ; 有限差分 ; 逆时偏移 ; 雷达成像
英文关键词	ground-penetrating radar finite difference reverse time migration radar imaging
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:5979680
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235794
作者单位	中国地质大学(北京), 地下信息探测技术与仪器教育部重点实验室, 北京 100083, 中国
推荐引用方式 GB/T 7714	鲁兴林,钱荣毅. 地质雷达有限差分逆时偏移方法研究[J],2017,32(2):885-890.
APA	鲁兴林,&钱荣毅.(2017).地质雷达有限差分逆时偏移方法研究.地球物理学进展,32(2),885-890.
MLA	鲁兴林,et al."地质雷达有限差分逆时偏移方法研究".地球物理学进展 32.2(2017):885-890.