Ground Wave Propagation in the Presence of Smooth Hills and Depressions,
Abstract
Electromagnetic waves propagating along the ground-air interface are influenced markedly by terrain features. Previous studies have dealt extensively with abrupt changes in surface properties (modeled in terms of surface impedance), or abrupt changes in height as represented by precipitous hills or valleys, on the convexly curved earth's surface. When the terrain changes gradually, as in the presence of smooth hills or depressions, it is necessary to consider the effects of variable concave surface curvature, and more generally those of a gradual change over from concave to convex, on the signal propagation characteristics. Of special interest are the fields observed on or near the surface when the source is also situated on or near the surface. This paper is concerned with a review of earlier work on the concave surface problem, and with a summary of our current effort to adapt and extend these results to ground wave propagation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1975
- Accession Number
- ADA054107
Entities
People
- Andrew J. Green
- L. B. Felsen