Propagation impairments on a very-low-elevation-angle C-band satellite link

Lin, Kuan-Ting; Dissanayake, A.; Cotner, C.

doi:10.2514/6.1994-1045

Cited by 1 publication

(2 citation statements)

References 3 publications

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“…The σ o term accounts for low-angle fading which is essentially frequency independent. It was derived using experimental fading data from two experiments; one in Clarksburg, MD [23], and the other in Ottawa, Canada [24]. Both experiments used antennas with diameters close to 4 m.…”

Section: F Low-angle Fadingmentioning

confidence: 99%

“…Cloud attenuation distribution in New York, NY[11]; ae predicted, x: measured; frequency 35 GHz; elevation angle 90°; cloud amounts use for the prediction are: total cloud cover -70.5%, stratus -34.5%, nimbo stratus -13.5%, cumulus -3%, cumulonimbus -2.3%. Predicted and measured low-angle fading/tropospheric scintillation distributions of fading on a 2° elevation angle C-band link at Clarksburg, MD[23]; frequency 3.95 GHz; measurement period: 30 days in September 1993. Predicted and measured low-angle fading/tropospheric scintillation distributions of fading on a 1° elevation angle C-band link at Eureka, Canada[24]; frequency 6 GHz.…”

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confidence: 99%

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A prediction model that combines rain attenuation and other propagation impairments along Earth-satellite paths

Dissanayake¹,

Allnutt

Haidara

1997

IEEE Trans. Antennas Propagat.

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257

124

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The rapid growth of satellite services using higher frequency bands such as the Ka-band has highlighted a need for estimating the combined effect of different propagation impairments. Many projected Ka-band services will use very small terminals and, for some, rain effects may only form a relatively small part of the total propagation link margin. It is therefore necessary to identify and predict the overall impact of every significant attenuating effect along any given path. A procedure for predicting the combined effect of rain attenuation and several other propagation impairments along earth-satellite paths is presented. Where accurate model exist for some phenomena, these have been incorporated into the prediction procedure. New models were developed, however, for rain attenuation, cloud attenuation, and low-angle fading to provide more overall accuracy, particularly at very low elevation angles (<10°). In the absence of a detailed knowledge of the occurrence probabilities of different impairments, an empirical approach is taken in estimating their combined effects. An evaluation of the procedure is made using slant-path attenuation data that have been collected with simultaneous beacon and radiometer measurements which allow a near complete account of different impairments. Results indicate that the rain attenuation element of the model provides the best average accuracy globally between 10 and 30 GHz and that the combined procedure gives prediction accuracies comparable to uncertainties associated with the year-to-year variability of path attenuation. Index Terms-Microwave radio propagation meteorological factors, Satellite communication. I. INTRODUCTION Rapid growth in new satellite services incorporating Very Small Aperture Terminals (VSAT) and Ultra Small Aperture Terminals (USAT) is expected in the coming years. Small size terminals allow for widespread use of satellite services in small business and domestic applications. Some of the services that can benefit from small

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Section: F Low-angle Fadingmentioning

confidence: 99%

mentioning

confidence: 99%