Abstract
A number of reports have been written on the occurrence and causes of regular fadings, or quasiperiodic (QP) scintillations, in amplitude and phase of satellite radio-transmissions in the VHF range. QP scintillations have been associated with the E- or F-region ionospheric phenomena. Further analysis of the amplitude data suggests that QP scintillations may be closely linked with an interference effect of electromagnetic waves simultaneously transmitted by two satellites moving within the beamwidth of the receiving antenna. A certain type of QP scintillations could be due to an interference effect between the satellite and ground transmissions.
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