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Radio-wave propagation for space communications systemsThe most recent information on the effects of Earth's atmosphere on space communications systems is reviewed. The design and reliable operation of satellite systems that provide the many applications in space which rely on the transmission of radio waves for communications and scientific purposes are dependent on the propagation characteristics of the transmission path. The presence of atmospheric gases, clouds, fog, precipitation, and turbulence causes uncontrolled variations in the signal characteristics. These variations can result in a reduction of the quality and reliability of the transmitted information. Models and other techniques are used in the prediction of atmospheric effects as influenced by frequency, geography, elevation angle, and type of transmission. Recent data on performance characteristics obtained from direct measurements on satellite links operating to above 30 GHz have been reviewed. Particular emphasis has been placed on the effects of precipitation on the Earth/space path, including rain attenuation, and ice particle depolarization. Other factors are sky noise, antenna gain degradation, scintillations, and bandwidth coherence. Each of the various propagation factors has an effect on design criteria for communications systems. These criteria include link reliability, power margins, noise contribution, modulation and polarization factors, channel cross talk, error rate, and bandwidth limitations.
Document ID
19810009558
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ippolito, L. J. (NASA Headquarters Washington, DC United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1981
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Report/Patent Number
EC-4
NASA-TP-1770
Accession Number
81N18082
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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