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Unavailability due to rain of VSAT networks operating in Ka and Ku bands in Brazil
Author(s) -
Felix L. E. M.,
Pontes M. S.,
Dhein N. R.,
Migliora C. G.
Publication year - 2006
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.827
Subject(s) - unavailability , computer science , remote sensing , attenuation , telecommunications , communications satellite , meteorology , environmental science , satellite , geology , geography , physics , reliability engineering , optics , astronomy , engineering
The unavailability due to rain of VSAT star networks operating on Ku and Ka bands in Brazil is analysed in this paper. A large number of simulations performed over the Earth–space links resulting from combinations of four (real and hypothetical) satellites with six Brazilian Earth stations provide a good characterization of the rain unavailability in tropical and equatorial regions subject to heavy rainfall and thunderstorms. The simulations also compare the influence on the estimated unavailability of the use of two different ITU‐R rain attenuation models and two values (calculated and measured) for the rainfall rate exceeded during 10 −2 % of the time, the climatic parameter in the models, in addition to the link polarization employed. The results obtained point to VSAT star networks as a practical solution to provide telecommunications services to remote communities. Copyright © 2006 John Wiley & Sons, Ltd.