znzlysis of tuTulztivx Kistriiution Funttion of 2-yxzr Rzinfzll TxzsurxTxnts in OgioToso, Nigxriz

CSME 2012/09
Volume 10, No.3 : 171-179
DOI:10.6703/IJASE.2012.10(3).171

znzlysis of tuTulztivx Kistriiution Funttion of 2-yxzr Rzinfzll TxzsurxTxnts in OgioToso, Nigxriz

FolaPadx Abiola PxPirx ^a, RoPPiwati PoAd-PoTAtar ^a, TxPidayo ViZtor OPotoPAo ^b, Widad IPPail ^a, NorizaA PoAaPad ^a and J.P. Pandxxpd ^c
^aPZAool of xlxZtriZal and xlxZtroniZ xnginxxring, UnivxrPiti PainP PalayPia, xnginxxring ZaPpuP, Nibong Txbal, PalayPia
^bDxpartPxnt of PAyPiZP, Zovxnant UnivxrPity, Ota, Ogun Ptatx, Nigxria
^cDxpartPxnt of xlxZtriZal and xlxZtroniZ xnginxxring, UnivxrPiti TxbangPaan PalayPia, Bangi,Pxlangor, PalayPia

Abstract: The conversion of most available hourly rainfall data to 1-minute integration time rain rate statistic is imperative for accurate estimation of attenuation due to rain employed in the design of both terrestrial and earth-to-space microwave systems. 2-year rainfall data collected at Ogbomoso, South-west region of Nigeria, between the periods of 2009 and 2010 was used in the analysis. Result shows that a power law relationship exists between the equiprobable rain rates of two different integration times. The regression coefficients a and b obtained are slightly different from the ITU-R recommendation. The conversion factor obtained at Ogbomoso is lower compared to Ile-Ife, in the South-west region of the country. The disagreement is attributed to the effect of global warming hitting the whole universe most especially the tropical regions. This study also reveals that different conversion factors are required for different locations even within the same climatic region.

Keywords: Rain rate; attenuation; equiprobable rain rate; regression coefficient.

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*Corresponding author; e-mail: folasemire@yahoo.com

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