Cloud attenuation modelling for satellite network links performance improvement
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All local climate zones need to develop relevant climatic models such as cloud
attenuation model which can serve as correlative resources to global satellites applications and
a means of determining local link margins for satellite networks services in localities. Effects
of suspended water droplets (SWD) and suspended ice crystals (SIC) which constitute clouds
are major concern in the design and successful operation of satellite communication system at
frequencies above 3GHz because the hydrometeors reduces the services availability critically
as frequency increases. This work is a review of cloud attenuation modelling, using as a case
study typical research work been carried out, to develop cloud attenuation model for tropical
Ota (6.7oN, 3.23oE), southwest Nigeria. Cloud attenuation modelling for a station involve
obtaining clouds parametric system equation from their numerical representations, taking into
consideration the climatic initial and boundary conditions. The numerical representations are
collected climatological and radiometric data, derived from well-designed experiments in
which cloud parameters measurements are carried out using radiances change measured by
satellites and visual observations from the surface station(s) on land and ships in the ocean.
The on-going research work begin with the study of performance of eight foundation cloud
models at the station, through their detailed evaluation from cloud cover data and radiosonde
data analysis, followed by analysis of collected over three years spectrum analyser signal
attenuation data. Then modelling analysis of the station spectrum analyser data collected at
computed elevation angle 56.18o to Astra 2(E-G) Satellite located at 28.2oE, which involve
comparisons of the derived attenuation distribution curves, both of the spectrum analyser data
and those of the existing cloud models for the station, with the derived attenuation distribution
curves of output data generated by each run session of the station simulation equation program.
The general representation of the station cloud attenuation model is stated and the specific
model equation is been worked on.
Keywords
Q Science (General), QC Physics