Abstract:

In this study, an electromagnetic inverse scattering problem to reveal the geometric and dielectric properties of three-dimensional (3D) objects buried underground by measuring from above is discussed. The solution of the problem is achieved by using the distorted born iterative method (DBIM). The interface separating the air and soil media is illuminated from above with an electromagnetic wave source and electric field measurements are conducted across a region above. While plane waves are used as an electromagnetic wave source, which are sent consecutively with different arrival angles, measurements are taken at more than one point along a plane. The geometric and electrical properties of objects in a volumetric region of interest are revealed by determining the complex dielectric constant of this region. Various numerical results are presented to show the success of the presented method in detecting three-dimensional objects with arbitrary geometry buried into earth. The results show that the distorted born iterative method is very successful in determining both geometric and dielectric properties of objects with low and medium contrast. While the location and geometric properties of high contrast objects are successfully found, the relative dielectric constants and conductivities are found to be lower than their real values.

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