Abstract
The demand for satellite services is rapidly increasing on a daily basis. One of the major concern for satellite telecommunication designer is the impacts of gas attenuation on earth-space path link, most importantly in tropical areas. This research has been directed on the analysis and comparison of gas attenuation prediction models at Covenant University, Ota,southwest Nigeria (Lat: 6.7 °N, Long: 3.23 °E). Gas attenuation data were collected from spectrum analyzer and Davis automatic weather station for a period offive years (April 2012-December 2016) from Astra 2E/2F/2G Satellite link set at an elevation angle of 59.9°on 12.245 GHz. The monthly gas attenuation were analysed and compared with existing gas attenuation prediction models that could provide guide to microwave propagation engineers in the tropical region. The results suggest that even during clear-sky, gas attenuation still pose a threat to the design of satellite communication on earth-space path. Therefore, ITU-R model may be more accurate for modelling gas attenuation for the region. Hence, the statistics provided in this work will help engineers in planning and designing good telecommunication systems in the tropical region.
Highlights
The theory explaining the interaction between molecules and radiation of gases in telecommunication ascertained fact that microwave signals experience significant attenuation that can appreciably degrade the quality of signal transmissions [1]
One of the major concern for satellite telecommunication designer is the impacts of gas attenuation on earth-space path link, most importantly in tropical areas.This research has been directed on the analysis and comparison of gas attenuation prediction models at Covenant University, Ota,southwest Nigeria (Lat: 6.7 oN, Long: 3.23 oE)
The monthly gas attenuation were analysed and compared with existing gas attenuation prediction models that could provide guide to microwave propagation engineers in the tropical region.The results suggest that even during clear-sky, gas attenuation still pose a threat to the design of satellite communication on earth-space path
Summary
The theory explaining the interaction between molecules and radiation of gases in telecommunication ascertained fact that microwave signals experience significant attenuation that can appreciably degrade the quality of signal transmissions [1]. The ability of the atmosphere to scatter and absorb transmitted signals depends on tropospheric parameters such as pressure, relative humidity and temperature [5]. Other atmospheric gases such as nitrogen and carbon dioxide only turn out to be problematic in very dry air circumstances at frequencies greater than 70 GHz. losses instigated by tropospheric absorption differ with frequency. Few solar radiations are propagated back to space by vapours, while some attenuates back to planetary by gases through total or partial absorption of ozone and water vapour by atmospheric molecules [9]. There is need for us to shift our focus from rain to clear-air (non-rainy) attenuation because knowledge of this impairment will increase exact performance of quality of signal for the period of a severe weather condition
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