Estimation of cross-polarization due to rain over some stations in Nigeria
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- 作者：Joseph Sunday Ojo (1) josnno@yahoo.com
- 关键词：Rainfall rate – ; Cross ; polarization discrimination – ; Lognormal distributions – ; Ku and Ka bands
- 刊名：Annals of Telecommunications
- 出版年：2012
- 出版时间：June 2012
- 年：2012
- 卷：67
- 期：5-6
- 页码：241-245
- 全文大小：295.3 KB
- 参考文献：1. Sen R, Geetha P, Uma S (2007) Estimation of cross-polarization due to rain over some stations in India. Indian J Radio and Sp Phys 30:379–382
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10. ITU-R P.618-9 (2007) Propagation data and Prediction methods required for the design of Earth-Space Telecommunication Systems, Recommendation P, ITU-R Ser.,Inter. Telecommun Union, Geneva, Switzerland
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- 刊物类别：Engineering
- 刊物主题：Engineering, general
Electronic and Computer Engineering - 出版者：Springer Paris
- ISSN：1958-9395
文摘
The statistical morphology of cross-polarization due to rain is of considerable interest to system designers in order to estimate accurately the signal total availability of time. In this paper, an attempt has been made to compute cross-polarization of millimeters waves in the Ku- and Ka-band frequencies range due to rain. ITU-R P.618-9 model has been used to predict cross-polarization discrimination (XPD) over three different elevation angles in Nigeria with modification using log-normal distributions of raindrop sizes at 20掳C and assuming circular polarization for Earth–satellite propagation paths. The study includes a number of earth stations in Nigeria, namely Akure, Ikeja, Calabar, Minna, and Kano. Variations of co-polar attenuation with XPD as well as cumulative distribution of XPD have also been presented. The result of the estimation of XPD at various elevations angles and at the frequencies considered shows the dependence of XPD on frequency, co-polar attenuation, and rainfall rates. The orthogonal channels at the same frequency situated at the coastal region is prone to higher amount of unwanted signal mostly at the elevation angle of 23掳 (for communication links over the Indian Ocean) than at other elevation angles considered in this report.