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基于归一化互相关成像条件的GPR逆时偏移成像
探地雷达 逆时偏移 归一化互相关成像条件 零时刻成像条件
2019/3/7
针对基于零时刻成像条件的探地雷达(GPR)逆时偏移精度低、难以对复杂结构进行高精度成像的缺点，将归一化互相关成像条件应用于GPR叠前逆时偏移成像。从二维GPR电磁波方程出发，采用基于完全匹配层(PML)边界条件的时域有限单元法(FETD)模拟电磁波正向和逆向传播，采用归一化互相关成像条件获取叠前逆时偏移的偏移结果，将空间高通滤波用于压制互相关过程中产生的低频噪声，然后编制相应的GPR叠前逆时偏移程...
Interpretation of Dune Genesis from Sedimentogical Data and Ground Penetrating Radar (GPR) Signatures: A Case Study from Ashirmata Dune Field, Mandvi Beach, Gujarat, India
Coastal Dune Ashirmata Region Sedimentogical Analysis
2012/9/11
The coastal dunes located near the Ashirmata region, south of Mandvi beach lies near the straight coast have been stud-ied by making use of sedimentological information and Ground Penetrating Radar (G...
从Maxwell方程组出发,推导了探地雷达(GPR)有限元波动方程.阐述了透射边界条件和Sarma边界条件的原理,推导了这两种边界条件的理论公式;通过在衰减层内加入过渡带优化了Sarma边界条件的加载方法,压制了介质区和衰减层交界面处的人为反射.考虑到透射边界条件与Sarma边界条件不同的理论机制,提出了一种结合透射边界条件和Sarma边界条件的混合边界条件,它利用Sarma边界条件对到达边界区域...
交替方向隐式差分(ADI-FDTD)法突破了Courand-Friedrich-Levy(CFL)条件的约束,具有无条件稳定的特点;而单轴各向异性完全匹配层(UPML)边界条件具有宽频带吸收特性,不需要对电场和磁场进行分裂,迭代公式简单,便于编程的特点.综合两者优势,本文提出了基于UPML边界条件的ADI-FDTD探地雷达数值模拟算法,通过对3个二维Maxwell方程进行离散化,推导了GPR波的A...
Building damage caused by tree roots: laboratory experiments of GPR and ERT surveys
Building damage caused by tree roots laboratory experiments GPR ERT surveys
2010/6/16
The root growth of trees close to buildings can cause directly or indirectly structural damages and the necessity arises of diagnostic tools to follow their time-spatial behaviour. In this framework, ...
Mapping soil fractal dimension in agricultural fields with GPR
soil fractal dimension agricultural fields GPR
2009/11/2
We documented that the mapping of the fractal dimension of the backscattered Ground Penetrating Radar traces (Fractal Dimension Mapping, FDM) accomplished over heterogeneous agricultural fields gives ...
Integrating GPR and CCRI techniques：Implications for the identification and mapping of ground ice on Mars
ground ice identification and mapping Mars
2009/6/1
Our results show that GPR and CCRI techniques effectively complement each other by resolving different characteristics of the subsurface. While GPR clearly showed the subsurface structures and interfa...
ANN-based sub-surface monitoring technique exploiting electromagnetic features extracted by GPR signals
ANN-based sub-surface monitoring technique electromagnetic features GPR signals
2008/11/14
In this work we consider the problem of determining the dielectric characteristics of sub-surface layers by means of GPR systems. In particular, a suitable electromagnetic feature (the RΓ parameter), ...
GPR based soil electromagnetic parameters determination for subsurface imaging
GPR soil electromagnetic parameters determination subsurface imaging
2008/11/14
The problem of estimating the dielectric permittivity and the electric conductivity of the soil starting from GPR measurements is addressed. A new estimation procedure is proposed and checked against ...
Detection of metallic and plastic landmines using the GPR and 2-D resistivity techniques
Detection metallic and plastic landmines GPR 2-D resistivity techniques
2007/12/4
Low and non-metallic landmines are one of the most difficult subsurface targets to be detected using several geophysical techniques. Ground penetrating radar (GPR) performance at different field sites...
Sedimentary successions and internal structure of the coastal barrier-lagoon system of Boao, eastern Hainan Island were studied through utilizing data from test holes and trenches and grou...