Effect of Second-Order Ionospheric Delay on GPS Orbit and Precise Point Positioning

M. Elsobeiey, A. El-Rabbany

Abstract:	At present, Precise Point Positioning (PPP) solution requires about 30 minutes or more to converge to an acceptable accuracy level. This is mainly due to the inadequate modeling of correlated GPS residual errors, including the higher-order ionospheric delay. In addition, neglecting these residual errors can lead to biases in the estimated orbit and clock solutions. In this paper, we attempt to rigorously model the secondorder ionospheric delay, which is the most significant among the higher-order ionospheric delay terms. The impact of second-order ionospheric delay on GPS satellite orbit and clock solutions is investigated. Implementation and handling of second-order ionospheric delay in PPP is also manipulated to achieve faster convergence time.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	2489 - 2495
Cite this article:	Elsobeiey, M., El-Rabbany, A., "Effect of Second-Order Ionospheric Delay on GPS Orbit and Precise Point Positioning," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2489-2495.
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