The Optical Behavior of the Ground for Short Radio Waves

Feldman, C.B.

doi:10.1109/jrproc.1933.227778

Cited by 19 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A year later, Feldman used measurements of the direct and reflected rays in the line-of-sight region to measure the dielectric properties for transmissions up to 30 MHz [21]. and Mumford, were reported in 1935 [23].…”

Section: Radio Propagation Experimentsmentioning

confidence: 99%

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

Davis¹

2013

View full text Add to dashboard Cite

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

show abstract

Section: Radio Propagation Experimentsmentioning

confidence: 99%

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

Davis¹

2013

View full text Add to dashboard Cite

show abstract

“…l. Methods using the groundwave: (a) Field strength versus distance measurements (Feldman, 1933;King, 1956;Eliassen, 1957;Ryazantsev and Shabel'nikov, 1965), (h) Wave Tilt (Feldman, 1933;Barfield, 1934;…”

Section: Appendixmentioning

confidence: 99%

Crossed‐Dipole Method of Measuring Wave Tilt

King

1968

Radio Science

View full text Add to dashboard Cite

Techniques for measuring the wave tilt for parallel and perpendicular polarization are reviewed and an extensive bibliography is included. An additional measurement technique is proposed which should be useful for the HF, MF, and LF range, and has potential application in the VLF band. Measurement of the phase difference between the signals induced in crossed dipoles lying in the plane of incidence allows determination of the ground constants.

show abstract

“…For an antenna on an imperfectly conducting plane n = 2WlI o , (13) where W is the ratio of the Hertzian potential due to an antenna on an imperfectly conducting plane to that on a perfectly conducting plane. W may be expressed as the sum of two infinite convergent series, A and D, which are defined in Appendix I (page 70).…”

Section: Part I-vertical Antennas On the Surface Of The Earthmentioning

confidence: 99%

Radio Propagation Over Plane Earth-Field Strength Curves

Burrows¹

1937

Bell System Technical Journal

View full text Add to dashboard Cite

The Optical Behavior of the Ground for Short Radio Waves

Cited by 19 publications

References 23 publications

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

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

Crossed‐Dipole Method of Measuring Wave Tilt

Radio Propagation Over Plane Earth-Field Strength Curves

Contact Info

Product

Resources

About