Modeling of Cloud Attenuation on Earth - Space Path in Ota Southwest Nigeria
| Autor: | Akinyemi Marvel Lola, Emetere Moses Eterigho, Omotosho Temidayo Victor, Akinwumi Sayo Akinloye, Adewusi Oladimeji Mustapha, Ometan Oluwafunmilayo Oluwayemisi |
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| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Automatic weather station business.industry Attenuation Cloud cover 020206 networking & telecommunications Cloud computing 02 engineering and technology 01 natural sciences law.invention law Liquid water content Attenuation coefficient 0202 electrical engineering electronic engineering information engineering Radiosonde Environmental science Longitude business 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | 2019 6th International Conference on Space Science and Communication (IconSpace). |
| DOI: | 10.1109/iconspace.2019.8905951 |
| Popis: | A new cloud attenuation model on earth-space path has been develop for a tropical station (6.7°N, 3.23°E) based on cloud cover, radiometric measurement and climatological data at the Covenant University in Ota. The collection of station data by a 7GHz spectrum analyzer for the total attenuation at elevation angle of 59.9° to Astra 2 satellites located at longitude 28.2°E. Automatic weather station parameters and daily visual clouds observation; as well as the acquisition of station radiosonde data were carried out. The station spectrum analyzer data between 2014 and 2017 were analyzed to obtain cloud attenuation contributions from the total attenuation measurement. The measured Cloud attenuation was compared with eight existing cloud attenuation models. Cloud attenuation at 12.245 GHz is 3.40 dB compare to 0.81 dB cloud attenuation predicted by ITU-RP 840 model, next is the Liebe's model, followed by Slobin model. A new developmental model was derived for the tropical station. The new cloud attenuation model was developed using the station radiosonde data from 1953–2011 for the computations of each cloud layer's liquid water content and specific attenuation coefficient. The cumulative distribution curves obtained was compared with each simulation distribution and the closest match to the station measured cumulative distribution is considered in the new cloud attenuation model for the station. The new model predicted 4.0 dB margins for clouds attenuation at 0.01% unavailability for the station. The study reveal cloud attenuation was under estimate by the eight existing cloud attenuation model for the tropical station. |
| Databáze: | OpenAIRE |
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