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Title of Journal: J Geod

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Abbravation: Journal of Geodesy

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Springer Berlin Heidelberg

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DOI

10.1007/978-1-349-22784-6

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1432-1394

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Application of SWACI products as ionospheric corre

Authors: David Minkwitz Tatjana Gerzen Volker Wilken Norbert Jakowski
Publish Date: 2014/02/21
Volume: 88, Issue: 5, Pages: 463-478
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Abstract

In Global Navigation Satellite Systems GNSS using Lband frequencies the ionosphere causes signal delays that correspond with link related range errors of up to 100 m In a first order approximation the range error is proportional to the total electron content TEC of the ionosphere Whereas this first order range error can be corrected in dualfrequency measurements by a linear combination of carrier phase or coderanges of both frequencies singlefrequency users need additional information to mitigate the ionospheric error This information can be provided by TEC maps deduced from corresponding GNSS measurements or by ionospheric models In this paper we discuss and compare different ionospheric correction methods for singlefrequency users The focus is on the comparison of the positioning quality using dualfrequency measurements the Klobuchar model the NeQuick model the IGS TEC maps the Neustrelitz TEC Model NTCMGL and the reconstructed NTCMGL TEC maps both provided via the ionosphere data service SWACI http//swaciwebdlrde in near realtime For that purpose data from different locations covering several days in 2011 and 2012 are investigated including periods of quiet and disturbed ionospheric conditions In applying the NTCMGL based corrections instead of the Klobuchar model positioning accuracy improvements up to several meters have been found for the European region in dependence on the ionospheric conditions Further in mid and lowlatitudes the NTCMGL model provides results comparable to NeQuick during the considered time periods Moreover in regions with a dense GNSS ground station network the reconstructed NTCMGL TEC maps are partly at the same level as the final IGS TEC mapsWe would like to express our gratitude to the editors and reviewers for their remarks for the improvement of this paper Additionally we thank IGS SPIDR and WDC Kyoto for making available high quality GNSS and georelated data Further we would like to express our gratitude to the Aeronomy and Radiopropagation Laboratory of the Abdus Salam International Centre for Theoretical Physics Trieste/Italy providing NeQuick version 202 for scientific purposes Finally thanks to our colleagues of DLR’s Institute of Communications and Navigation maintaining provision of GNSS measurements via EVnet and to our colleagues of DLR’s Earth Observation Center supporting the SWACI service

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