DOI: 10.5937/jaes15-11784
This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions.
Volume 15 article 487 pages: 550 - 555
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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