UHF Satellite Communication During Scintillation
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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The effects of ionospheric UHF scintillation on satellite communications are described in terms of relatively simple fading channel models. Two methods of countering the effects of scintillation induced fading on satellite communications are presented and analyzed. First, threshold testing techniques which effectively erase faded data are discussed. These techniques are most easily applied to add scintillation protection to an operating communication system which handles segments or blocks of data. Second, time diversity modulation techniques which can counter scintillation and other channel problems such RFI and excess noise in the same operation are discussed. These time diversity modultaion techniques offer somewhat better performance than the threshold techniques at the cost of a somewhat more complex interface between the basic receiver and the anti-scintillation processor.
- Radio Communications