DISPERSIVE DISTORTIONS OF SYSTEM CHARACTERISTICS OF BROADBAND TRANSIONOSPHERIC RADIO CHANNELS
Abstract
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.
References
/1/ Budden K.G. Radiowaves in the ionosphere. Cabridge: Univ. press. 1961. 542 p.
/2/ Cannon P. S., Angling M. J., Lundborg B. (2002) Characterization and modeling of the HF communications channel. Review of Radio Science: 1999-2002. - Pp. 597–622.
/3/ Gherm V. E., Zernov N. N., Lundborg B. et al. (2001) Wideband Scattering Functions for HF Ionospheric Propagation Channels. Journal of Atmospheric and Solar Terrestrial Physics, 63, 1489-1497.
/4/ Ivanov D. V., Ivanov V. A., Mikheeva N. N., Ryabova N. V., Ryabova M. I. (2015) Propagation of broadband HF signals in a medium with nonlinear dispersion. Journal of Communications Technology and Electronics, 60(11), 1205-1214
/5/ Ivanov V.A., Ivanov D.V., Ryabova M.I., Miheeva N.N., Katkov E.V. (2013) Broadband signal distortion in the ionosphere, caused by nonlinear frequency dispersion. Vestnik of Volga State University of Technology. Series “Radio Engineering and Infocommunication Systems”, 2, 5-15.
/6/ Kislitsin A.A. (2015) Algorithms of determination of time variations of total electron content in the upper atmosphere of the Earth. Vestnik of Volga State University of Technology. Series “Radio Engineering and Infocommunication Systems”, 2, 27-40.
/7/ Kryukovsky A.S., Lukin D. S., Rastyagaev D. V. (2009) Research of singularities of short radio wave propagation in non-uniform anisotropic ionosphere. Electromagnetic Waves and Electronic Systems, 14(8), 17-26.
/8/ Kryukovskii A.S. Lukin D.S., Rastyagaev D.V., Skvortsova Y.I. (2015) Mathematical simulation of propagation of frequency-modulated radio waves in ionospheric plasma. Journal of Communications Technology and Electronics, 60(10), 1049-1057.
/9/ Maslin N.M. (1987) HF communications: a systems approach. London: Pitman Publishing, Pp. 89.
/10/ Salous S., Bertel L. (2000) CD-ROM Proc. Millennium Conf. on Antennas & Propagation. (AP2000). Davos. 9-14 Mar. 2000. Noordwijk: Europ. Space Res. And Technol. Centre, 2000. P. 0958.
/11/ Yasyukevich Y.V., A.A. Mylnikova, V.V. Demyanov, V.V. Ivanov, N.V. Ryabova, A.A. Zuev, M.I.Ryabova, A.A. Kislitsin. (2013) Diurnal variation of vertical total electron content over the cities Irkutsk and Yoshkar-Ola according to the data of GPS/GLONASS and IRI-2012 model. Vestnik of Volga State University of Technology. Series Radio Engineering and Infocommunication Systems, 3, 18-29.
Yasyukevich Y.V., Mylnikova A.A., Kunitsyn V.E., Padokhin A.M. (2015) Influence of GPS/GLONASS differential code biases on the determination accuracy of the absolute total electron content in the ionosphere. Geomagnetism and Aeronomy, 55(6), 763-769.
