DocumentCode :
1038948
Title :
Short-period sky-wave fading of CW emissions
Author :
Hutchinson, H.
Author_Institution :
U.S. Army Siganl Corps, Washington, DC, USA
fYear :
1952
fDate :
8/1/1952 12:00:00 AM
Firstpage :
12
Lastpage :
18
Abstract :
A study of the short-period sky-wave fading of cw emissions shows that observed characteristics of these fading distributions are functions of the relative amplitudes of the received and magneto-ionic components. When the received magneto-ionic components are essentially equal at the receiving point, severe and rapid fading occurs and variations in short-period fading are maximum. However, when a single mode of propagation is suppressed, the variations in short-period fading distributions of the received field are reduced and become lognormal in character. A new parameter is suggested to replace the Rayleigh distribution in cases where a more accurate formulation of short-period fading characteristics is desired. Finally, a description is given of a practical method of emitting cw radio transmissions, which yields reflections from the ionosphere of a single ionospheric mode, thereby obtaining some man-made control over short-period sky-wave fading.
Keywords :
Ionospheric propagation; Attenuation; Fading; Frequency; Rayleigh channels; Reflection; Time measurement;
fLanguage :
English
Journal_Title :
Antennas and Propagation, Transactions of the IRE Professional Group on
Publisher :
ieee
ISSN :
2168-0639
Type :
jour
Filename :
1144258
Link To Document :
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