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Theses

Modélisation des effets des scintillations ionosphériques sur la propagation des ondes électromagnétiques en bande L aux latitudes polaires.

Abstract : The ionospheric plasma is located at the border between neutral atmosphere and outer space and many complex ionization reactions occur inside this turbulent medium. The Earth magnetic field and induced electric fields cause rapid fluctuations of electron density, both spatially and temporarily. When crossing this turbulent layer, RF signals show fast variations of amplitude and phase, especially at high latitudes. This phenomenon is called ionospheric scintillation and it is particularly feared by air navigation using GNSS services, since it degrades the availability and the integrity of signals. This PhD dissertation presents a complete modeling of the effects of ionospheric scintillation, with 3 anisotropy axes. It is based on a numerical approach using the multiple phase screens technique, both in 3D and 2D schemes, and on the analytical resolution of electromagnetic propagation equation, also both in 3D and 2D configurations. The limits of use of a 2D numerical scheme have been outlined by these original formulations of phase and log-amplitude variances and spectra. This complete modeling associated with a sensitivity study on these variances and spectra opens up interesting perspectives on data inversion, in order to better estimate the physical characteristics of the ionospheric medium.
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https://hal.archives-ouvertes.fr/tel-01203660
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Submitted on : Wednesday, September 23, 2015 - 3:08:00 PM
Last modification on : Thursday, October 28, 2021 - 3:16:37 PM
Long-term archiving on: : Tuesday, December 29, 2015 - 9:38:17 AM

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Hélène Galiègue. Modélisation des effets des scintillations ionosphériques sur la propagation des ondes électromagnétiques en bande L aux latitudes polaires.. Electromagnétisme. UNIVERSITE TOULOUSE 3 PAUL SABATIER, 2015. Français. ⟨tel-01203660⟩

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