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Model of rainfall-rate distribution for radio system design

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1 Author(s)
Moupfouma, F. ; Centre National d'¿¿tudes des T¿¿l¿¿communications, CRPE, Paris, France

Owing to the interest raised by the precipitation effects in the design of satellite and terrestrial microwave radiolinks, it is necessary to have a simple and valuable mathematical model which can represent, with good accuracy, the whole rain-rate distribution, from lowest rain-rate values to the tail of this distribution. Previously the author suggested a two-parameter model which adequately represents the rainfall intensity cumulative distributions for several hydrometeorological zones of the world. This model has log-normal asymptotic behaviour for low rainfall rates, and gamma asymptotic behaviour for the high ones. The present paper deals with a further improvement by expressing both parameters as a function of the rainfall rate exceeded during 0.01% of the time, and recommended by the CCIR to evaluate the availability of microwave radio links.

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings H  (Volume:132 ,  Issue: 1 )