Some experiments on the propagation over land of radiation of 9.2-cm wavelength, especially on the effect of obstacles

McPetrie, J.S.; Ford, L.H.

doi:10.1049/ji-3a-1.1946.0138

Cited by 5 publications

(4 citation statements)

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“…Studies made at 3000 MHz indicate that stone buildings and groups of trees so dense that the sky cannot be seen through them should be regarded as opaque objects aroiond which diffraction takes place [McPetrie and Ford, 1946]. At 3000 MHz the loss through a 23centimeter thick dry brick wall was 12 db and increased to 46 db when the wall was thoroughly soaked with water.…”

Section: -5mentioning

confidence: 99%

Transmission loss predictions for tropospheric communication circuits, Volume 1

Rice¹,

Longley²,

Norton³

et al. 1965

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The National Bureau of Standards is a principal focal point in the Fvderal Government for assuring maximum application of Iti. physical and enpinveriina sciences it) the ad~ziiienient oif technology ill iodustr% anid commerivrce. Its responsibilities include development and mainteniaic oif the niational simolar(Is idf measurement, and the provisions of means for making measuremnrirts conskistet %ith tbose slannda rds; determination of t~aical constants arid properties of materials: ditviclopirnt it(o methiods for te-ting materials, rncchari. s, and soructures. and making such tests it-; may be riccessarv, parlicti. larlv for gove-rnrnent agencies; cooperation in (lie establishment of standard piactices for incorpora. lion in codes and specifications; advisory servire to} government ag~encies on scientific tod itechinial prolemsn: inivenrtion and development of devices to serve special needs of fay Laboratory Abtmophy-irs at the Vniver-ity ,I Col.,ratr locaird at ltoulder, h.. 1

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Section: -5mentioning

confidence: 99%

Transmission loss predictions for tropospheric communication circuits, Volume 1

Rice¹,

Longley²,

Norton³

et al. 1965

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“…These points in general form a discrete set which are exactly the "points of reflection" used in geometrical optics, and indeed, doing this should give us precisely the geometrical optics solution. It may be remarked that this very solution has already been used with some success by McPetrie and Ford [12] and by Shelleng,Burrows,and Ferrell [13] to analyze some actual data, while Keller and Keller [14] have devised several formulas to be used in this connection. [Vol.…”

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confidence: 99%

An integral equation approach to the problem of wave propagation over an irregular surface

Hufford¹

1952

Quart. Appl. Math.

101

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“…and 1943 evaluating the propagation of 30 MHz to 3 GHz transmissions [32,33]. These included tests of foliage and building obstruction, as well as diffraction across the top of a smooth hill.…”

Section: Radio Propagation Experimentsmentioning

confidence: 99%

A Technique for Evaluating the Uncertainties in Path Loss Predictions Caused by Sparsely Sampled Terrain Data

Davis¹

2013

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Radio propagation models provide an estimate of the power loss in a communication link caused by the surface of the ground, atmospheric refraction, foliage, and other environmental factors. Many of the models rely on digital topographic databases to provide information about the terrain, and generally the databases are sparsely sampled relative to the electromagnetic wavelengths used for communication systems. This work primarily develops a technique to evaluate the effects of that sparsity on the uncertainty of propagation models.That is accomplished by accurately solving the electromagnetic fields over many randomly rough surfaces which pass through the sparse topographic data points, many possible communication links, all of which fit the underlying data, are represented. The power variation caused by the different surface realizations is that due to the sparse sampling. Additionally, to verify that this solution technique is a good model, experimental propagation measurements were taken, and compared to the computations. The experimental work presented in Chapter 7 required the help of many individuals from VT, NSWC, and NRAO. In addition to Ben and Dr. Brown, Wes Sizemore at NRAO, and Bruce Naley, Punk Chilton and Natasha Lagoudous from NSWC all put in lots of work during the weeks conducting the experiment. Bruce was invaluable for climbing 100 feet up the water tower, with the antenna and spectrum analyzer, to take measurements. Additionally, equipment was provided by NSWC, and many at NRAO provided help in experiment planning, regulatory approval, and scrounging for parts, and fixing broken equipment.iii

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Some experiments on the propagation over land of radiation of 9.2-cm wavelength, especially on the effect of obstacles

Cited by 5 publications

References 0 publications

Transmission loss predictions for tropospheric communication circuits, Volume 1

Transmission loss predictions for tropospheric communication circuits, Volume 1

An integral equation approach to the problem of wave propagation over an irregular surface

A Technique for Evaluating the Uncertainties in Path Loss Predictions Caused by Sparsely Sampled Terrain Data

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