Journal ArticleDOI
An alternative integral equation for propagation over irregular terrain, 2
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TLDR
In this article, an integral equation for cauculating the attenuation of radio waves propagating over irregular terrain is derived and applied to three terrain profiles, and the solutions are compared with solutions obtained by using classical methods such as residue series and diffraction theory.Abstract:
An integral equation for cauculating the attenuation of radio waves propagating over irregular terrain is rederived. The integral equation is applied to three terrain profiles, and the solutions are compared with solutions obtained by using classical methods such as the residue series and diffraction theory.read more
Citations
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The ancient and modern history of EM ground-wave propagation
TL;DR: In this article, an attempt is made to describe the ground-wave mechanism that is omni-present, and it is shown that the trapped surface wave can be a significant contribution to the total groundwave field, when the Earth boundary is sufficiently inductive.
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Terrain-based propagation model for rural area-an integral equation approach
TL;DR: In this paper, a terrain-based propagation model for vertically polarized radio waves is described, based on the field integral equation for a smooth surface, which is simplified from a 3D integral equation model to a one-dimensional integral equation by assuming that the surface is magnetically perfectly conducting with no transverse variations.
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Propagation prediction techniques and antenna modeling (150 to 1705 kHz) for intelligent transportation systems (ITS) broadcast applications
TL;DR: The propagation-prediction models and antenna-analysis methods described here can be used for designing systems and making performance predictions for both of these ITS applications, or for any other systems that operate in this band of frequencies from 150 to 1705 kHz.
Journal ArticleDOI
Numerical Investigations of and Path Loss Predictions for Surface Wave Propagation Over Sea Paths Including Hilly Island Transitions
Gokhan Apaydin,Levent Sevgi +1 more
TL;DR: In this paper, a finite element method based multi-mixed path surface wave virtual propagation predictor tool FEMIX is developed for the first time in the literature, sea-land-sea (island) transition problem including non-flat (hilly) islands is investigated systematically.
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A hybrid (finite difference-surface Green's function) method for computing transmission losses in an inhomogeneous atmosphere over irregular terrain
TL;DR: In this article, an implicit finite difference (IFD) scheme is applied between the irregularly shaped ground and an altitude z =z/sub h/, below which all inhomogeneities of the medium are assumed localized.
References
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Journal ArticleDOI
Ultra-Short-Wave Propagation
TL;DR: In this paper, a method of measuring attenuation and field strength in the ultra-short-wave range is described, and a resume of some of the quantitative experiments carried out in the range between 17 megacycles (17 meters) and 80 megacecles (3.75 meters) with distances up to 100 kilometers is given.
Journal ArticleDOI
An Integral Equation Approach to the Problem of Wave Propagation over an Irregular Surface
TL;DR: In this paper, an approximate formulation of the problem of a scalar wave propagated over an irregular bounding surface is derived in the form of a one-dimensional Volterra integral equation.
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Radio propagation over a gaussian-shaped ridge
TL;DR: In this article, the propagation factor for wave propagation over an impedance surface containing irregularities which are large compared to a wavelength is calculated for the special case of a two-dimensional Gaussian ridge.
Journal ArticleDOI
Further studies of the influence of a ridge on the low-frequency ground wave
J.R. Wait,A. Murphy +1 more
TL;DR: In this article, the effect of a nonsmooth ground for low frequencies is a emiellip tical or semicylindrical boss on an otherwise flat ground plane of perfect conductivity.