Performance of SBAS Ionospheric Estimation in the Equatorial Region

R. Lejeune, M.B. El-Arini, P. Doherty, J. Klobuchar, E. De Paula, F. Rodrigues, A. Canavitsas

Abstract:	The performance of Satellite-Based Augmentation System (SBAS) ionospheric estimation algorithms in equatorial regions was analyzed using recorded Brazilian GPS data. Algorithms similar in design to those employed by the U.S. Wide Area Augmentation System (WAAS) were used. The results of the analysis confirm those of a previous analysis that was based on data generated with an ionospheric model. The structure of the equatorial ionosphere, which causes GPS ionospheric range delays to vary from one point in space and time to another, is much more complex than the mid-latitude ionosphere and presents a difficult challenge to the development of a single-frequency SBAS capable of supporting a high availability of vertically guided approaches. The combined effects of the equatorial slant-to-vertical conversion errors, spatial and temporal decorrelation errors, modeling and estimation errors, and the demanding integrity requirements imposed on the error bounds broadcast by an SBAS, result in large error bounds that will severely limit the availability of vertically guided approach procedures during the local evening hours near the peak of the solar cycle.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1658 - 1669
Cite this article:	Lejeune, R., El-Arini, M.B., Doherty, P., Klobuchar, J., De Paula, E., Rodrigues, F., Canavitsas, A., "Performance of SBAS Ionospheric Estimation in the Equatorial Region," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1658-1669.
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