This paper presents a new study of the effects on communications whithin the coastal harbor system of such environmental factors as nonstationary signal propagation characteristics and nonstationary atmospheric noise. Propagation of signals during daylight hours is predominantly by ground-wave propagation over sea water. During the evening hours, sky-wave and ground wave propagation takes place. The noise at receiving sites during daylight hours is predominantly set by the level of galactic or man-made noise some 40 to 45 dB above thermal. During the evening hours, the level of atmospheric noise may at times reach some 90 dB above thermal. The conditional distribution of intraarea signal-to-interference ratio at the receiving antenna is shown to be approximately lognormal with a standard deviation of 23 dB during the day and a standard deviation of 16 dB during the night, for an area of high atmospheric noise.
A study of environmental constraints in the coastal harbor radiotelephone system
Studium ueber Umweltfaktoren in einem Kuestenfunkfernsprechsystem
IEEE Transactions on Vehicular Technology ; 26 , 3 ; 226-238
1977
13 Seiten, 13 Bilder, 5 Tabellen, 20 Quellen
Article (Journal)
English
A study of environmental constraints in the coastal harbor radiotelephone system
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