Radar Polarimetry Analysis Applied to Single-Hole Fully Polarimetric Borehole Radar
Radar Polarimetry Analysis Applied to Single-Hole Fully Polarimetric Borehole Radar
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DOI：
10.1109/tgrs.2006.882260
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发表时间：
2006-11
影响因子：
8.2
通讯作者：
Jian-Guo Zhao;Motoyuki Sato
中科院分区：
文献类型：
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作者：
Jian-Guo Zhao;Motoyuki Sato
研制了一种全极化钻孔雷达系统，该系统采用四种偶极天线和缝隙天线的组合，用于在钻孔中采集全极化数据集。首先，为了实现雷达极化分析，提出了一种适用于分析系统采集的单孔反射数据集的处理方案。该处理包括天线特性补偿、用于图像重建的偏移和用于单频数据集构造的时频分析。两个极化目标分解方法，即：1）泡利分解和2）基于特征向量的分解，被应用到地下裂缝的散射问题的特征。Pauli分解方法提供了重要的裂缝雷达极化信息，基于特征向量的分解方法为理解不同性质裂缝的散射机制做出了重要贡献。此外，可以通过分析由局部雷达图像区域的基于特征向量的分解提供的H-α分布来获得关于裂缝分类的信息。极化目标分解技术的潜力，裂缝表征，这反过来又提供了有价值的信息，水渗透性的裂缝水文地质研究
A fully polarimetric borehole radar system using four combinations of dipole and slot antennas was developed to acquire fully polarimetric data sets in drilled boreholes. First, to implement radar polarimetry analysis, a processing scheme suitable for analyzing a single-hole reflection data set acquired by the system is presented. This processing consists of antenna-characteristic compensation, migration for image reconstruction, and time-frequency analysis for single-frequency data set construction. Two polarimetric target decomposition methods, namely: 1) Pauli decomposition and 2) eigenvector-based decomposition, are applied to characterize the scattering problem of the subsurface fractures. The Pauli decomposition method provided important radar polarimetry information of fractures, and the eigenvector-based decomposition method made a significant contribution to understanding the scattering mechanisms from different fractures with different properties. Furthermore, information about fracture classification can be obtained by analysis of the H-alpha distribution provided by eigenvector-based decomposition of local radar image regions. The potential of polarimetric target decomposition techniques to fracture characterization is shown, which, in turn, provides valuable information about water permeabilities of fractures in hydrogeological studies