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Author: search.filters.author.Lakanchanh, DonekeoSubject: search.filters.subject.Yearly cumulative time of rainfall rate

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    Rainfall rate and rain attenuation model in Bangkok, Thailand
    (2008-12-01)
    Chankeaw, Natthapong
    ;
    Udomariyasap, Pongputhai
    ;
    Lakanchanh, Donekeo
    ;
    Noppanakeepong, Suthichai
    ;
    Leelaruji, Nipha
    This paper describes the measurement of rainfall rate at King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand, by using satellite signal from Thaicom5. Three years measurement of rainfall rate are presented. The experimental results indicate that the measured rainfall rate are 90mm/hr in 2005, 94 mm/hr in 2006 and 102 mm/hr in 2007. Moreover, we have developed new modify prediction model of rain attenuation by ITU-R rain attenuation model. The model provides for prediction of annual and for expected year to year variations. This model applied to collecte data compared with ITU-R model. From the results of prediction model at KMITL, we found that the highest rainfall rate 102 mm/hr in 2007 cause to signal attenuate 14.34 dB. © 2008 IEEE.
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    Propagation effect by rain in Ku and Ka band satellite communication system
    (2006-12-01)
    Lakanchanh, Donekeo
    ;
    Udomareyasap, Pongputhai
    ;
    Leelaruji, Nipha
    ;
    Hemmakorn, Narong
    This paper present the contribute of rainfall rate and rain attenuation in Ku band measurement and prediction rain attenuation in Ka band by using ITU-R model at King Mongkut's Institute of Technology Ladkrabang (KMITL), Bangkok, Thailand. One year measurement of rainfall rate and rain attenuation of Ku band satellite signal of 59 degree elevation angle is presented. The experimental results, we found that on the rainfall rate R<inf>0.01</inf> is 90 mm/hr, the measured Ku band rain attenuation A<inf>0.01</inf> is about 11 dB while predicted Ka band rain attenuation is 20 dB, The effect of rain attenuation characteristics of Ka band and Ku band satellite signals are compared. © 2006 IEEE.