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

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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.

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Acknowledgments

This project was funded by the EPSRC. We are grateful to the International GNSS Service (IGS) for the GPS observation data and for the GPS precise ephemeris. We acknowledge the use of data provided by the UNAVCO Facility with support from the National Science Foundation and NASA under NSF Cooperative Agreement No. EAR-0735156. We acknowledge the use of National Geophysical Data Center (NGDC) coastline data. We acknowledge the participation of Andrew Brown of the University of Southampton.

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  1. Department of Electronic and Electrical Engineering, University of Bath, Bath, BA2 7AY, UK

    Damien J. Allain & Cathryn N. Mitchell

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  1. Damien J. Allain
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  2. Cathryn N. Mitchell
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Correspondence to Damien J. Allain.

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Allain, D.J., Mitchell, C.N. Comparison of 4D tomographic mapping versus thin-shell approximation for ionospheric delay corrections for single-frequency GPS receivers over North America. GPS Solut 14, 279–291 (2010). https://doi.org/10.1007/s10291-009-0153-0

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  • DOI: https://doi.org/10.1007/s10291-009-0153-0

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