NDLI: A fast finite difference method for propagation predictions over irregular, inhomogeneous terrain

Content Provider	IEEE Xplore Digital Library
Author	Janaswamy, R.
Copyright Year	1963
Abstract	Propagation of electromagnetic waves over irregular, inhomogeneous terrain is solved by a finite difference scheme. The method is fast and requires considerably less memory than the integral equation methods. The method requires a storage space of order O(N) and an execution time of order O(N/sup 2/). Fields generated by a TE/sub 2/ line source are represented in an integral form in terms of the field over a flat, constant impedance plane (the incident field), 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 computational domain. The sparse matrix generated by the method is inverted by the Ricatti transform. Numerical results are presented for the ground wave as well as for the sky wave. Comparison is made for known geometries to establish the validity and limitations of the method.<>
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	1257
Ending Page	1267
Page Count	11
File Size	1128570
File Format	PDF
ISSN	0018926X
Volume Number	42
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Finite difference methods Electromagnetic propagation Electromagnetic scattering Integral equations Tellurium Impedance Green's function methods Sparse matrices Transforms Geometry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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