Short-pulse three-dimensional scattering from moderately rough surfaces: a comparison between narrow-waisted Gaussian beam algorithms and FDTD

In this paper, with reference to short-pulse three-dimensional scattering from moderately rough surfaces, we present a comparison between Gabor-based narrow-waisted Gaussian beam (NW-GB) and finite-difference time-domain (FDTD) algorithms. NW-GB algorithms have recently emerged as an attractive alte...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2006-01, Vol.54 (1), p.157-167
Main Authors: Galdi, V., Kosmas, P., Rappaport, C.M., Felsen, L.B., Castanon, D.A.
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Approximation
Diffraction, scattering, reflection
Dispersion
Electromagnetic (EM) scattering by rough surfaces
Electromagnetic propagation
Electromagnetic scattering
Exact sciences and technology
Finite difference method
Finite difference methods
Finite difference time domain method
finite-difference time-domain (FDTD) methods
Gaussian beams
Gaussian beams (optics)
Ground penetrating radar
Radar scattering
Radiocommunications
Radiolocalization and radionavigation
Radiowave propagation
Rough surfaces
Scattering
Soil
Soils
Surface roughness
Telecommunications
Telecommunications and information theory
Time domain analysis
Wave propagation
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Summary:In this paper, with reference to short-pulse three-dimensional scattering from moderately rough surfaces, we present a comparison between Gabor-based narrow-waisted Gaussian beam (NW-GB) and finite-difference time-domain (FDTD) algorithms. NW-GB algorithms have recently emerged as an attractive alternative to traditional (ray-optical) high-frequency/short-pulse approximate methods, whereas FDTD algorithms are well-established full-wave tools for electromagnetic wave propagation and scattering. After presentation of relevant background material, results are presented and discussed for realistic parameter configurations, involving dispersive soils and moderately rough surface profiles, of interest in pulsed ground penetrating radar applications. Results indicate a generally satisfying agreement between the two methods, which tends to improve for slightly dispersive soils. Computational aspects are also compared.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2005.861568