The two and a half dimensional finite difference program, FDTD2D, of Moghaddam et al. computes the radar responses for an arbitrary 2-D conductivity, permittivity and permeability model with one or more embedded current source(s). After Fourier transformation in the strike direction, the program solves for the six electromagnetic fIeld components as functions of (x, y, k, t), and then inverse transforms them. Fields are calculated via a set of finite-difference, time domain equations on a staggered grid following Yee. Time derivatives are also represented by central differences, and electric and magnetic fields are solved for equal but staggered steps in time. The regular model grid is terminated using the "absorbing" boundary conditions of Liao et al.


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