A three-dimensional imaging technique for a directional borehole radar

摘要

In this paper we describe a directional borehole radar system. We first present the simulation and design of the antenna system. The antennas are positioned in a bistatic setup. In order to obtain a focused radiation pattern the transmitting and receiving dipoles are each shielded with a curved reflector. The radiation pattern of this scattered wavefield is computed by solving the integral equation for the unknown electric surface current at the conducting surface. Based on these numerical simulations, a prototype has been built. The radiation pattern measured in the plane perpendicular to the antenna is in good agreement with the computed pattern. Subsequently, we discuss a three-dimensional imaging method for this borehole radar. The computed radiation pattern is used in such a way that deconvolution for the angular radiation pattern can be applied. Some preliminary imaging results will be presented.