Reference : Galileo Single Frequency Ionospheric Correction: Performances in Terms of Position
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Engineering, computing & technology : Electrical & electronics engineering
http://hdl.handle.net/2268/117284
Galileo Single Frequency Ionospheric Correction: Performances in Terms of Position
English
Bidaine, Benoît mailto [Université de Liège - University of Liège - ULg / FNRS > Département de géographie - Department of Geography > Unité de Géomatique - Geomatics Unit > >]
Lonchay, Matthieu mailto [Université de Liège - University of Liège - ULg / FNRS > Département de géographie - Department of Geography > Unité de Géomatique - Geomatics Unit > >]
Warnant, René mailto [Université de Liège - ULg > Département de géographie > Unité de Géomatique - Géodésie et GNSS >]
1-Jan-2013
GPS Solutions
Springer
17
1
63-73
Yes (verified by ORBi)
International
1080-5370
1521-1886
Heidelberg
Germany
[en] Galileo ; positioning ; ionospheric correction ; single frequency ; NeQuick model ; data ingestion
[fr] Géodésie et GNSS
[en] For GPS single frequency users, the ionospheric contribution to the error budget is estimated by the well-known Klobuchar algorithm. For Galileo, it will be mitigated by a global algorithm based on the NeQuick model. This algorithm relies on the adaptation of the model to slant Total Electron Content (sTEC) measurements. Although the performance specifications of these algorithms are expressed in terms of delay and TEC, the users might be more interested in their impact on positioning. Therefore, we assessed the ability of the algorithms to improve the positioning accuracy using globally distributed permanent stations for the year 2002 marked by a high level of solar activity. We present uncorrected and corrected performances, interpret these and identify potential causes for Galileo correction discrepancies. We show vertical errors dropping by 56–64 % due to the analyzed ionospheric corrections, but horizontal errors decreasing by 27 % at most. By means of a fictitious symmetric satellite distribution, we highlight the role of TEC gradients in residual errors. We describe mechanisms permitted by the Galileo correction, which combine sTEC adaptation and topside mismodeling, and limit the horizontal accuracy. Hence, we support further investigation of potential alternative ionospheric corrections. We also provide an interesting insight into the ionospheric effects possibly experienced during the next solar maximum coinciding with Galileo Initial Operation Capability.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/117284
10.1007/s10291-012-0261-0
The final publication is available at www.springerlink.com.

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