Study of Cloud Impact on Fixed Satellite Communication Link at Ku, Ka and V Bands in Nigeria

The study investigates the effect of clouds on fixed satellite communication link on earth-space path in Nigeria for 0.01 to 10% unavailability of an average year. The input data (from August 2002 to July 2009) used for the study are base on recent meteorological data measured from space by the Atmospheric Infrared Sounder satellites (AIRS). The International Telecommunication Union Radio Propagation Recommendation (ITU-RP, 2009) procedure was used for the computation of cloud attenuation statistics for each of the 37-stations for link to Nigeria Communication Satellite (NigComsat-1), for both uplink and downlink frequencies. At Ku band (12/14 GHz), cloud fade is between 0.2 to 0.55 dB, for Ka band (20/30 GHz), 0.6 to 2.4 dB and for V band (40/50 GHz) 2.0 to 6.0 dB. A Contour map of cloud attenuation at Ku, Ka and V-band for 0.01% unavailability, at 0.1 by 0.1 degree latitude and longitude for downlink and uplink to NigComsat-1 was developed. The maps show consistently that impact of cloud is generally severe in the southern part of Nigeria