Abstract
This paper presents a modified approach to the characterization of Electromagnetic (EM) environments irradiated by unknown sources. The approach based on application of Finite difference method (FDM) for the solution of Maxwell's equations subject to the constraints imposed by the measured values of the field at a relatively small number of measurement points and by the specified boundary conditions. The resulting III-conditioned system of equations is solved using Conjugate Gradient Method (CGM) which proves to be an accurate method for extraction of maximum information from minimum measurement effort. The applicability of the approach to EM environment characterization is demonstrated through two dimensional and three dimensional examples.
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