MoM analysis of dipole antennas in crosshole borehole radar and field experiments
MoM analysis of dipole antennas in crosshole borehole radar and field experiments
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DOI：
10.1109/tgrs.2006.888431
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发表时间：
2007-08-01
影响因子：
8.2
通讯作者：
Hashimoto, Yuuki
中科院分区：
文献类型：
--
作者：
Ebihara, Satoshi;Hashimoto, Yuuki
在本文中，我们提出了一种矩量法（MoM）的分析，包括井间钻孔雷达的影响，我们验证了矩量法代表井间钻孔雷达数据正确。本文导出了电点源辐射电场的远场近似。在这个推导中，我们假设点源是在一个圆柱形分层介质，而所观察到的电场是在另一个圆柱形分层介质。导出的方程用作传递函数，以连接用于发射天线的两个阻抗矩阵ne和用于接收天线的另一个阻抗矩阵。在这些矩阵中，完全包括了井眼散射场的影响。我们进行了现场实验，在花岗岩与控制钻孔介质，以调查钻孔的影响。在本文中，我们估计的相对幅度和群延迟的接收信号之间的充水的钻孔情况和充气的钻孔情况。本文表明，估计的幅度和延迟依赖于频率和所提出的矩量法可以预测这些频率依赖性。
In this paper, we propose a method-of-moments (MoM) analysis that includes the borehole effects on crosshole borehole radar, and we verify that the MoM represents the crosshole borehole radar data correctly. We derive the far-field approximation of an electric field radiated by an electric point source. In this derivation, we assume that the point source is in a cylindrically layered medium, while the observed electric field is in another cylindrically layered medium. The equations that are derived are used as a transfer function to connect the two impedance matrices ne for the transmitting antenna and the other one for the receiving one. In these matrices, the influence of the scattered field by the borehole is included completely. We conducted field experiments in granite with a controlled borehole medium in order to investigate the influence of the borehole. In this paper, we estimated the relative amplitude and the group delay of the received signals between the water-filled borehole case and the air-filled borehole case. This paper showed that the estimated amplitude and delay depend on the frequency and that the proposed MoM could predict these frequency dependencies.