17 June 1996 Modeling and stability considerations for FDTD analysis of wave propagation in lossy dispersive soils
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Abstract
The finite-difference time-domain (FDTD) algorithm, when modified to include dispersion, is a convenient tool for analyzing wave propagation in lossy, dispersive soils. It has been shown recently that a convenient way to include the dispersion is through a spatial array of digital permittivity or conductivity filters, one filter at each space node in the finite-difference grid. We address here the problem of selecting filter coefficients that result in accurate and stable FDTD implementations. We present a systematic procedure for determining the coefficients based on a nonlinear optimization procedure and stability test.
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William H. Weedon, Carey M. Rappaport, Daniel Silevitch, "Modeling and stability considerations for FDTD analysis of wave propagation in lossy dispersive soils", Proc. SPIE 2747, Radar Sensor Technology, (17 June 1996); doi: 10.1117/12.243082; https://doi.org/10.1117/12.243082
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