NDLI: Comparison of 4D tomographic mapping versus thin-shell approximation for ionospheric delay corrections for single-frequency GPS receivers over North America

Content Provider	Springer Nature Link
Author	Allain, Damien J. Mitchell, Cathryn N.
Copyright Year	2009
Abstract	The majority of navigation satellite receivers operate on a single frequency. They compensate for the ionospheric delay using either an ionospheric model which typically only corrects for 50% of the delay or a thin-shell map of the ionosphere. A 4D tomographic imaging technique is used to map the free electron density over the full-height of the ionosphere above North America during autumn 2003. The navigation solutions computed using correction based upon the thin-shell and the full-height maps are compared in this paper. The maps are used to calculate the excess propagation delay on the L1 frequency experienced by GPS receivers at selected locations across North America. The excess delay is applied to correct the single-frequency pseudorange observations at each location, and the improvements to the resulting positioning are calculated. It is shown that the thin-shell and full-height maps perform almost as well as a dual-frequency carrier-smoothed benchmark and for most receivers better than the unfiltered dual-frequency benchmark. The full-height corrections perform well and are considerably better than thin-shell corrections under extreme storm conditions.
Starting Page	279
Ending Page	291
Page Count	13
File Format	PDF
ISSN	10805370
Journal	GPS Solutions
Volume Number	14
Issue Number	3
e-ISSN	15211886
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-12-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ionosphere GPS Tomography Electrical Engineering Automotive Engineering Extraterrestrial Physics, Space Sciences Meteorology/Climatology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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