3-D Imaging of a Planar Interface Close to a Borehole with an Array-Type Directional Borehole Radar
3-D Imaging of a Planar Interface Close to a Borehole with an Array-Type Directional Borehole Radar
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DOI：
10.1109/igarss.2019.8898343
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
S. Ebihara;Shyuhei Kotani;Kengo Fujiwara
中科院分区：
文献类型：
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作者：
S. Ebihara;Shyuhei Kotani;Kengo Fujiwara
我们提出了一种算法，用于创建一个平面界面的三维图像与阵列式定向钻孔雷达。在本文中，我们重点研究的情况下，当雷达探头接近平面界面。在这种情况下，来自平面界面的反射波可以以非常陡的仰角入射到接收阵列天线上。这导致波在阵列元件处的不寻常的到达时间，并且因此导致在对平面界面进行成像时的一些误差。在我们的数值模拟中，所提出的算法生成了精确位置周围的界面的3D图像，而传统方法生成了与正确位置相反的一些虚假图像（即，偏离180 °）。然后，我们应用所提出的方法来分析反射波从现实世界中的故障在岩石中。使用所提出的算法，我们可以成功地创建一个三维图像的故障，虽然这是不可能与传统的方法。
We propose an algorithm for creating a 3-D image of a planar interface with an array-type directional borehole radar. In this paper, we focus on the situation when the radar probe is close to the planar interface. In such circumstances, the reflected wave from the planar interface may be incident on the receiving array antenna at very steep elevation angles. This causes unusual arrival times of the wave at the array elements, and consequently some errors in imaging the planar interface. In our numerical simulation, the proposed algorithm generated a 3-D image of an interface around an exact position whereas a conventional method produced some spurious images opposite the correct position (i.e., off by 180 deg.). We then applied the proposed method to analyze reflected waves from a real-world fault in a rock. Using the proposed algorithm, we could successfully create a 3-D image of the fault, although this was not possible with the conventional method.