Study the Effects of Dust and Sand Storms Attenuations on Satellites Link Margin over Libya
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Propagation Losses, Downlink, Model, Libya, Communication
Abstract
In this paper, the effect of dust and sand storm attenuation on the link margin of the satellite in geostationary orbit at X and Ku bands in the space-to-earth direction is studied for a satellite at 26°E longitude. A simulation model is used to predict the sand and dust storm attenuation and used to calculate the link margin in six locations in Libya, namely Benghazi, Tubruk, Tripoli, El-Kufra, Misrata, and Sebha. The simulations assume a 60 cm receive antenna diameter with 55% aperture efficiency. The downlink frequencies used in this study are 11.390 and 12.75 GHz for X- and Ku-bands, respectively. The free space path loss, gas attenuations, and scintillations fade depth are calculated for each band. Link margin, C/N, and Es/No (dB) are computed at X and Ku bands. The results indicate that all sites achieve a link margin above the threshold level (sensitivity) by 60 cm antenna diameter in all locations. The results show that the southern regions are the most affected by dust and sand storm attenuation and cases decreasing in link margin. In comparison to the Ku-band, the X-band was more capable of maintaining a good quality satellite link in dust and sand storm intensities.
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