Application of the measured equation of invariance to wave          propagation over irregular, inhomogeneous terrain
By: by Ramakrishna Janaswamy
Publisher: Naval Postgraduate School
Published: 1993
Place of publication: Monterey, Calif
Language: eng
Number of pages: 61
Subjects: Transmission; Electromagnetic waves; FINITE DIFFERENCE THEORY ELECTROMAGNETIC WAVE PROPAGATION
Other titles: NPS-EC-093-018.
Description: 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.
Notes: NPS-EC-93-018.

Cover title.

"October 1993."

AD A288 512.

Includes bibliographical references (p. 29-30)