Modern radio systems that use a transionospheric channel, are required signal bandwidth expansion. However, with
a significant bandwidth expansion, there is a problem of dispersive distortions signals due to different phase speed
of its spectral components. Evaluation of distortions is required comprehensive research of frequency dispersion for
such radio channels. The aim of the research is to solve this problem. Formulated the general provisions of theory
of frequency dispersion of phase shift in a medium. Formulas are obtained for components of dispersion through the
approximation of a refractive index of a wave at a satellite-to-Earth link. Dependencies were obtained to evaluate
dispersion parameters of various orders by the integral characteristics of electron density profile. Expressions were
obtained for band coherence of wideband transionospheric channels and method of its evaluation, also we present
the algorithm for constructing diagnostic maps of bands coherence for different regions by data of receiving stations
of satellite navigation systems.
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