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International Journal of Antennas and Propagation
Volume 2014, Article ID 150761, 8 pages
http://dx.doi.org/10.1155/2014/150761
Research Article

Bistatic Scattering due to Hydrometeors on Cochannel Intersystem Communication Links over a Subtropical Path

Department of Electrical, Electronics and Computer Engineering, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa

Received 2 May 2014; Revised 27 August 2014; Accepted 28 August 2014; Published 30 October 2014

Academic Editor: Tat Soon Yeo

Copyright © 2014 P. A. Owolawi and T. Wallingo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The performance of fixed satellite systems in the shared frequency band depends on the tolerance level of interference between them. Interference disturbs the functionality of the ground station and causes signal degradation. The knowledge of interference level must therefore be known for an optimal satellite design. In this work, we evaluate interference due to hydrometeors for a situation in which a satellite downlink signal is affected by the signal from a terrestrial microwave network operating at the same frequency as the satellite system in a subtropical station: Durban, South Africa. The evaluation of the transmission loss is based on the modified 3D bistatic radar equation and the exponential rain cell model for the scattering. The results of intersystem interference for different station separation over frequencies variation, terrestrial antenna gains, and exceedance probabilities are presented. The effect of the additional rain attenuation on the satellite signals is also examined. The results point out to some remarkable attenuation differences between the effective transmission loss and the transmission loss statistics for small time unavailability at the frequencies considered in this work. This could be detrimental in link budget design if overlooked.