2 edition of **Ground wave propagation over irregular, inhomogeneous terrain** found in the catalog.

Ground wave propagation over irregular, inhomogeneous terrain

R.H Ott

- 220 Want to read
- 29 Currently reading

Published
**1979**
by U.S. Dept. of Commerce, National Telecommunications and Information Administration
.

Written in English

**Edition Notes**

Statement | R.H. Ott, L.E.Vogler, G.A. Hufford. |

Series | NTIA report 79-20 |

Contributions | Vogler, L.E., Hufford, G.A., United States. National Telecommunications and Information Administration. |

ID Numbers | |
---|---|

Open Library | OL20085259M |

Chapter 12 discusses wave propagation in inhomogeneous media. Then, wave propagation becomes more difficult to compute numerically. The Helmholtz equation and the paraxial wave equation are generalized to inhomogeneous media. The beam propagation method (BPM) is introduced as a powerful numerical method for computing wave propagation in. the new FCC curves proposed for AM broadcast propagation:prediction in the band kHz. The program pr04ucesth~theoretical value of ground-wave radio field intensity at given"frequencies and distances and for given electric ground constants. The program will reproduce tJte particular family of curves published by the FCC [ll for use in.

terrace and lowland, meaning that irregular ground is quite popular in this area. A number of researches regarding wave propagation in an irregular ground have been reported so far. Most of them, however, deal with body waves and only a few have looked at surface waves. In addition, a completely flat ground. Radio Propagation above 40 MC over Irregular Terrain Abstract: Radio transmissions in the vhf and uhf frequency region over land areas always contend with the irregularities of the terrain and the presence thereon of dispersed quantities of trees, buildings, and other .

propagation and imaging through the atmosphere Download propagation and imaging through the atmosphere or read online books in PDF, EPUB, Tuebl, and Mobi Format. Click Download or Read Online button to get propagation and imaging through the atmosphere book now. This site is like a library, Use search box in the widget to get ebook that you want. Usually in applying these boundary conditions for estimating the influence of the flat ground surface on wave propagation over terrain, it is convenient to consider two separate situations: The first one is when the vector of the wave’s electric field component is perpendicular to the plane of incidence (the plane defined by vectors and.

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Get this from a library. Ground wave propagation over irregular, inhomogeneous terrain: comparisons of calculations and measurements. [R H Ott; Lewis E Vogler; G A Hufford; United States. National Telecommunications and Information Administration.].

Get this from a library. Measurements and predictions of HF ground wave radio propagation over irregular, inhomogeneous terrain. [J E Adams; United States. National Telecommunications and Information Administration.;]. LF Ground-Wave Propagation Over Irregular Terrain Article (PDF Available) in IEEE Transactions on Antennas and Propagation 59(4) - May with Reads How we measure 'reads'.

@article{osti_, title = {Groundwave propagation over very rough terrains}, author = {Bevensee, R M}, abstractNote = {A very powerful method of predicting single-frequency TM/sub /rho// ground wave propagation over irregular and/or inhomogeneous terrain is by a Volterra integral equation, based on Compensation Theorem for inhomogeneities.

NTIA Report Measurements and Predictions of HF Ground Wave Radio Propagation Over Irregular, Inhomogeneous Terrain J.E. Adams J.C. Carroll E.A. Costa D.R. Ebaugh, Jr. However, this R. BE VENSEE modification is somewhat inconsistent because W(^x) is defined for homogeneous terrain in equa- tions (31)-(33).

The predictions of WAGNER for measured ground wave propagation over various irregular terrains, both homogeneous and inhomogeneous, were most impressive (OTT, VOGLER and HUFFORD, ; OTT, a,b).Cited by: 3. 2 Handbook on Ground Wave Propagation In Hill [9] described an analytical method for extending the method of Ott and Berry [8] to propagation prediction over forested and built-up terrains that represents such terrains as dielectric slab layers over the irregular terrain.

A source code appears in the Appendix of Hill’s Size: 2MB. Irregular Terrain Attenuation in the Medium Frequency Band: Planning for Digital Radio Systems D.

de la Vega, S. López, U. Gil, D. Guerra, P. Angueira, A. Arrinda and J.L. Ordiales 1 Abstract— Some basic rules and values to include the attenuation effect of terrain obstacles in. Measurements of LF and MF radio propagation over irregular, inhomogeneous terrain [W. Kissick] on *FREE* shipping on qualifying offers.

This book is a reproduction of a volume found in the collection of the University of Michigan Library. It is produced from digital images created through the Library's large-scale digitization efforts.

Ground wave propagation over irregular, inhomogeneous terrain: comparisons of calculations and measurements / ([Washington]: Dept. of Commerce, National Telecommunications and Information Administration, ), by R.

Ott, G. Hufford, Lewis E. Vogler, and United States. National Telecommunications and Information Administration (page. In Arshad et al.

[64] wide-angle FE-based PE is applied to the propagation modeling over irregular terrain and on urban streets. To construct a FD-based solution of (1) the first step is to cover. In physics, a surface wave is a mechanical wave that propagates along the interface between differing media.

A common example is gravity waves along the surface of liquids, such as ocean waves. Gravity waves can also occur within liquids, at the interface between two fluids with different densities.

Elastic surface waves can travel along the surface of solids, such as Rayleigh or Love waves. Ground Wave propagation is a method of radio wave propagation that uses the area between the surface of the earth and the ionosphere for transmission.

The ground wave can propagate a considerable distance over the earth's surface particularly in the low frequency and medium frequency portion of the radio spectrum. Ground wave radio signal propagation is ideal for relatively short distance.

In electromagnetism and applications, an inhomogeneous electromagnetic wave equation, or nonhomogeneous electromagnetic wave equation, is one of a set of wave equations describing the propagation of electromagnetic waves generated by nonzero source charges and source terms in the wave equations make the partial differential equations inhomogeneous, if the source.

The surface wave phenomenon has recently been discussed by Tolstoy [] in connection with the propagation of sound over a randomly irregular surface.

This work is a development of an earlier treatment of the problem due to Blot [], involving propagation over a rigid surface formed by a homogeneous distribution of hemispherical bosses. Short Distance Ground Wave Propagation Modeling in Irregular and Forested Environments Crane, Zachary Michael, "Short Distance Ground Wave Propagation Modeling in Irregular and Forested Environments.

" Master's Thesis, University of Tennessee, A model for the phase of a ground wave propagating over irregular and forested. Ground wave propagation is particularly important on the LF and MF portion of the radio wave radio propagation is used to provide relatively local radio communications coverage, especially by radio broadcast stations that require to cover a particular : JAIRAM SANKAR.

A 1/2-wave vertical has 1 dB more gain than a short vertical. A 5/8-wave vertical has dB more gain. Predictions are valid at frequencies up to 15 or 20 MHz and at higher frequencies if there are not many obstructions along the path with heights of the order of 1/4 wavelength or greater and the landscape is fairly flat, no steep hills.

modelling of electromagnetic wave propagation over realistic earth’s surface through a radially inhomogeneous atmosphere. Electromagnetic waves propagate to longer ranges with two typical wave types: ground and sky waves.

Sky waves are mostly affected by the upper atmosphere (ionosphere), while ground wave propagation. Institute for Telecommunication Sciences. Books from the extended shelves: Loran radio navigation over irregular, inhomogeneous ground with effective ground impedance maps / (Boulder, Tabulations of propagation data over irregular terrain in the to MHz frequency range.

sphere, over irregular terrain and urban streets will be presented. Coverage diagrams at different frequen-cies and under different environment conditions will be presented.

Initially wave propagation in tropo-sphere over smooth terrain is described along with some ducting conditions and than results of propa-gation over irregular terrain will.A modification in the mathematical derivation of an integral equation for propagation over irregular, inhomogeneous terrain and a numerically stable algorithm, RING, is developed to extend the frequency range of program WAGNER to frequencies in the VHF region.

The solution to the integral equation is compared to residue theory and Fock theory and excellent agreement is obtained. Modification of the Apparent Curvature of the Earth by the Shape of the Ground Diffraction (or "Shadow") Zone General Stations at Ground Level Propagation over Inhomogeneous Terrains, Especially Mixed (Land-Sea) Trajectories Stations at Any Height Short Distances.

Quasi-Flat Earth Large Edition: 1.