Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..369s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, May 1991, p. 369-378.
Physics
Atmospheric Scattering, Atmospheric Turbulence, Millimeter Waves, Multipath Transmission, Radio Transmission, Wave Reflection, Ice, Line Of Sight, Scintillation, Snow, Troposphere, Vegetation
Scientific paper
Multipath propagation can occur for various reasons. For example, it can be due to sudden changes in the refractive index of the propagation medium or to reflections from melting snow/ice. It is seen that dry snow, or even 'moist' snow at 0 C, has no measurable effect on the propagation of radio waves up to at least 54.5 GHz. When multipath propagation occurs, the low frequency part of the scintillation spectrum is distorted. The usual theoretical predictions applicable to line-of-sight millimeter wave propagation through clear air turbulence must be used with caution when the scintillations of the propagating signals are a result of multipath effects. It is also noted that propagation through vegetation greatly distorts the clear-air scintillation spectrum. Saturation of scintillations, which can also dramatically alter the scintillation spectrum, is not expected to be a problem for millimeter wave propagation over line-of-sight paths.
Cole R. S.
Sarma Atish Das
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