Equivalent impedance of rough surface at low grazing angles
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Authors
Motta, Marcelo Jorge de Assis.
Subjects
Advisors
R. Janaswamy.
Date of Issue
1999-09
Date
September, 1999
Publisher
Monterey, California: Naval Postgraduate School
Language
en_US
Abstract
Equivalent impedance of a rough surface is determined by solving the problem of radiowave propagation over rough random surface by using the parabolic equation method. We consider horizontal polarization and assume the rough surface, defined by discrete points, to be perfectly conducting. This assumption has minimum effects for frequencies in the VHF band and above. The essential point of this thesis is to solve numerically a Volterra integral equation of the second kind for the surface current. Because the computation becomes very intense for long ranges, we present a multiple sections solution, where the solution procedure is successively repeated for smaller ranges. The numerical results are compared with results available in the literature. Finally, we apply the technique to determine the equivalent impedance of a sinusoidal random rough surface by comparing the resulting normalized field to the field of a 2-ray model over a constant impedance plane.
Type
Thesis
Description
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Department
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NPS Report Number
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Format
x, 80 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.