The focusing effect of ionospheric plasma waves on the probabilistic properties of the short-wave signal envelope is studied. It is shown that if only one envelope time realization is available, effective statistical characteristics should be used. Effective differential and integral probability distributions for the Rayleigh-Rice laws are obtained and analyzed. The role of effective statistical distribution moments is studied in a specific problem. The main conclusion made in the study is that the focusing effect is very important in processing fast fluctuations of the short-wave signal envelope, with standard probability distributions undergoing considerable distortions.
Department of Physics of Atmosphere and Mathematical Geophysics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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