Mode-expansion method for calculating electromagnetic waves scattered by objects on rough ocean surfaces

A mode-expansion method that needs less than 6% the number of unknowns required by conventional method of moments is introduced in calculating two-dimensional electromagnetic wave scattering from perfectly conducting objects on rough ocean surfaces. Modes are selected for dominant propagation waves...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2005-05, Vol.53 (5), p.1631-1639
Main Authors: Yan Zhang, Jie Lu, Pacheco, J., Moss, C.D., Ao, C.O., Grzegorczyk, T.M., Kong, J.A.
Format: Article
Language:English
Subjects:
Applied sciences
Diffraction, scattering, reflection
Electromagnetic propagation
Electromagnetic scattering
Electromagnetic wave scattering
Equations
Exact sciences and technology
method of moments (MoM)
mode-expansion method (MEM)
Moment methods
Oceans
Radar scattering
Radiocommunications
Radiowave propagation
rough surface
Rough surfaces
Sea surface
Surface roughness
Surface waves
Telecommunications
Telecommunications and information theory
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Summary:A mode-expansion method that needs less than 6% the number of unknowns required by conventional method of moments is introduced in calculating two-dimensional electromagnetic wave scattering from perfectly conducting objects on rough ocean surfaces. Modes are selected for dominant propagation waves so that the number of unknowns in the matrix equation are minimized. In the numerical examples, ocean surfaces are modeled as perfectly conducting rough surfaces described by the Pierson-Moskowitz power spectrum. Bistatic radar cross-sections (RCS) of various objects, such as ship-like and low-observable targets, are calculated for a 1-GHz incident plane wave and are validated for accuracy against an iterative MoM solution.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2005.846721