Application of the Measured Equation of Invariance to Wave Propagation Over Irregular, Inhomogeneous Terrain

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Authors
Janaswamy, Ramakrishna
Subjects
Electromagnetic Wave Propagation
Terrain Effects
Finite Differences
Advisors
Date of Issue
1993-10
Date
1993-10
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The problem of propagation of electromagnetic waves over irregular, inhomogeneous terrain is solved by a finite difference scheme. The method is fast and requires considerably less memory compared to the integral equation methods. The method requires a storage space of order 0(N) and an execution time of order 0(N2). Fields generated by a TEz line source are represented in an integral form in terms of the field over a fiat, constant impedance plane, and the field scattered by the terrain irregularities and inhomogeneities. Accurate expressions are provided for the incident field and the Green's function, whose evaluation is otherwise accomplished by the rather time-consuming Sommerfeld's integrals. Measured equation of invariance is used to terminate the mesh. The sparse matrix generated by the method is inverted using Ricatti transform. Numerical results are presented for the ground wave as well as the sky wave. Comparison is made for known geometries to establish the validity and limitations of the method
Type
Technical Report
Description
Series/Report No
Department
Electrical and Computer Engineering
Identifiers
NPS Report Number
NPS-EC-093-018
Sponsors
Naval Security Group Command.
Funder
Naval Security Group Command.
Format
61 p.: ill. ; 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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