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A Directional Borehole Radar System

机译：定向钻孔雷达系统

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摘要

In this paper we present the simulation and design of a directional borehole radar. In addition we discuss an imaging method for the radar system. The antenna system contains an electric dipole which is in one direction shielded by a cylindrical perfectly conducting reflector. The radiation pattern of the reflected wavefield is computed by first solving the integral equation. This equation combines the unknown electric surface current density on the reflector and the known incident field from the electric dipole. Once the electric surface current density is known, the radiation pattern of the system is computed using the integral representation over the reflector and the dipole. The radiation patterns for various configurations have been computed in order to find an optimal configuration. A prototype of the antenna system based on an optimal configuration has been built, and the directional radiation pattern has been measured in the plane perpendicular to the antenna system. The measurements were in good agreement with the computations. Subsequently a three dimensional imaging method for the borehole radar is presented. Here a deconvolution is carried out in the angular direction, making use of the computed radiation pattern. Some imaging results will be shown.
机译：在本文中，我们介绍了定向钻孔雷达的仿真和设计。另外，我们讨论了雷达系统的成像方法。天线系统包含一个电偶极子，该电偶极子在一个方向上被圆柱形的完美导电反射器屏蔽。通过首先求解积分方程来计算反射波场的辐射方向图。该方程式将反射器上的未知表面电流密度与电偶极子的已知入射场结合在一起。一旦知道了表面电流密度，就可以使用反射器和偶极子上的积分表示来计算系统的辐射方向图。为了找到最佳配置，已经计算出各种配置的辐射图。已经建立了基于最佳配置的天线系统原型，并且已经在垂直于天线系统的平面上测量了定向辐射方向图。测量结果与计算结果非常吻合。随后提出了一种用于井下雷达的三维成像方法。在此，利用计算出的辐射方向图在角度方向上进行反卷积。将显示一些成像结果。

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