Modelling of atmospheric impairments in stratospheric communications

Authors:
Gorazd Kandus;Mihael Mohorčič;Erich Leitgeb;Tomaž Javornik
Affiliations:
Department of Communication systems, Jožef Stefan Institute, Ljubljana, Slovenia;Department of Communication systems, Jožef Stefan Institute, Ljubljana, Slovenia;Institute of Broadband Communications, Graz University of Technology, Graz, Austria;Department of Communication systems, Jožef Stefan Institute, Ljubljana, Slovenia
Venue:
CISST'08 Proceedings of the 2nd WSEAS International Conference on Circuits, Systems, Signal and Telecommunications
Year:
2008

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Abstract

Stratospheric communication systems operating in the millimetre frequency bands are subject to atmospheric impairments caused by rain and scintillation. In this paper we address propagation channel modelling of these atmospheric impairments. In particular, we present a rain fading and a scintillation fading channel model for stratospheric communications. Rain fading is modelled according to the modified DLR segment approach for generating channel attenuation time series taking into consideration the specifics of stratospheric communication systems, namely the variable elevation angle and different carrier frequency. Additional fading due to scintillation, which may be harmful in deep fades caused by the rain, is modelled by adjusting the satellite scintillation channel model so that the amount of scintillation fading is correlated to the attenuation caused by the rain. The two models were implemented in a software tool enabling generation of the propagation channel attenuation time series for the fixed and the mobile stratospheric communication systems.