GNSS and SAR Signal Delay in Perturbed Ionospheric D-Region During Solar X-Ray Flares

We investigate the influence of the perturbed (by a solar X-ray flare) ionospheric D-region on the global navigation satellite systems (GNSS) and synthetic aperture radar (SAR) signals. We calculate a signal delay in the D-region based on the low ionospheric monitoring by very-low-frequency (VLF) ra...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2020-07, Vol.17 (7), p.1198-1202
Main Authors: Nina, Aleksandra, Nico, Giovanni, Odalovic, Oleg, Cadez, Vladimir M., Todorovic Drakul, Miljana, Radovanovic, Milan, Popovic, Luka C.
Format: Article
Language:English
Subjects:
Atmospheric modeling
D region
Delays
Electron density
Geodesy
Geodetics
Global navigation satellite system
Global navigation satellite systems (GNSS)
Ionosphere
Ionospheric disturbances
Ionospheric models
Ionospheric propagation
Navigation
Navigation satellites
Navigation systems
Navigational satellites
Perturbation methods
Radio waves
SAR (radar)
Satellites
Signal delay
Solar x-rays
Synthetic aperture radar
synthetic aperture radar (SAR) interferometry (InSAR)
Very Low Frequencies
very-low-frequency (VLF) radio signals
VLF radio waves
X rays
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Summary:We investigate the influence of the perturbed (by a solar X-ray flare) ionospheric D-region on the global navigation satellite systems (GNSS) and synthetic aperture radar (SAR) signals. We calculate a signal delay in the D-region based on the low ionospheric monitoring by very-low-frequency (VLF) radio waves. The results show that the ionospheric delay in the perturbed D-region can be important and, therefore, should be taken into account in modeling the ionospheric influence on the GNSS and SAR signal propagation and in calculations relevant for space geodesy. This conclusion is significant because numerous existing models ignore the impact of this ionospheric part on the GNSS and SAR signals due to its small electron density which is true only in quiet conditions and can result in significant errors in space geodesy during intensive ionospheric disturbances.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2019.2941643