The effect of ionospheric scintillation on VHF/UHF satellite communications

Computer Science – Performance

Scientific paper

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Communication Satellites, F Region, Ionospheric Disturbances, Scintillation, Amplitude Distribution Analysis, Auroral Zones, Power Spectra, Satellite Communication, Tropical Regions, Ultrahigh Frequencies, Very High Frequencies

Scientific paper

Ionospheric scintillations of the type caused by F-layer irregularities can degrade the performance of satellite communication links at UHF. The degradation is most severe for propagation paths that transit the auroral and equatorial ionospheres. In the present paper, scintillation data obtained in the auroral and equatorial regions are analyzed and the results are applied to the evaluation of the performance of satellite links. Amplitude fluctuations described by cumulative amplitude distributions are found to correlate well with the Nagakami m-distribution, while a Rayleigh distribution appears to describe the 'worst' case scintillations in the 225-400 MHz band. The effectiveness of using frequency diversity techniques to overcome the degradation due to scintillations is demonstrated.

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