Atmospheric gas impact on fixed satellite communication link a study of its effects at Ku, Ka and V bands in Nigeria
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The total atmospheric absorption due to Oxygen and water vapour on the earth-space path
at Ku (12/14 GHz), Ka (20/30 GHz), and V (40/50 GHz) bands was evaluated for
communication with Nigeria communication satellite (Nigcomsat1) on both uplink and down
link at 0.01 % unavailability of an average year. The basic input climatic data used include
monthly and yearly mean meteorological parameters of surface and vertical profiles of
pressure, temperature, and relative humidity obtained from recent measurement from space
by the Atmospheric Infrared Sounder (AIRS) instrument on NASA's Aqua spacecraft for the
period 2002 to 2006. The International Telecommunication Union Radio Propagation
Recommendation (ITU-RP 676, 2009) procedure was used for the computation of gaseous
attenuation for each of the 37-stations in Nigeria. Attenuation values were obtain for both
uplink and downlink frequencies, at Ku, Ka and V bands, total atmospheric absorption was
determined to be between (0.11 to 0.24) dB, (0.7 to 1.1) dB and (0.82 to 3.1) dB for Ku, Ka,
and V bands respectively. Contour maps showing a consistent signal absorption due to
Oxygen is generally higher in the South-West region and water-vapour attenuation higher in
the South-South part of Nigeria are presented.
Keywords
Q Science (General), QC Physics