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The employment of frequency re-use in orthogonal polarization continues to gain recognition due to the congestion in the lower frequency bands and the demand for more satellite service applications. However, communication signals operating above 10 GHz and adopting frequency re-use in orthogonal polarization, are often hampered by cross-polarization among others. In this paper, an attempt has been made to estimate cross-polarization discrimination (XPD) due to subtropical rain at super high frequency ranges in order to estimate accurately the signal total availability needed for satellite services in this region. Cross-polarization has been estimated based on the ITU model in the recommendation 618-9 over the Intelsat 17 (IS-17) Satellite (Geostationary at 66°E) with its service footprint links, at the respective elevation angle, to each of the nine locations within the provinces of South Africa. The estimation is based on modification using log-normal distributions of raindrop sizes at 20 °C and assuming circular polarization for Earth-space propagation paths. Some results of the influence of co-polar attenuation, frequency and subtropical rainfall rates are investigated. The overall information will enable the system provider to locate repeater stations for optimum performances within the provinces of South Africa.
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- Statistical Studies of Cross-Polarization Due to Subtropical Rain on SHF Radio Propagation Paths Over Some Stations in South Africa
J. S. Ojo
P. A. Owolawi
- Springer US