Benefit of Partial L2C Availability for Correcting Ionospheric Error for Standalone GPS

K. O'Keefe, D. Wang, M.G. Petovello, C. Gernot

Abstract:	In this paper, the possibility of using partial availability of L2C signals to provide an ionospheric correction for the other single frequency satellites is investigated. Consideration is only given to standalone users. The available dual-frequency measurements are used to determine a zenith ionospheric error estimate that is then used to generate slant ionospheric corrections for each of the L1 C/A pseudorange measurements. The resulting corrections are then compared to those obtained with the broadcast ionosphere model and International GNSS Service (IGS) generated zenith ionosphere values. The corresponding position solutions are also compared to the uncorrected L1 C/A code position solution, and the position solution obtained by using the broadcast model. Results are assessed for the case when one, two or three L2C satellites are in view in order to determine if the number of satellites significantly affects results. Results presented are obtained from a large set of real data collected using a dual-frequency front-end in conjunction with the University of Calgary GSNRxTM software receiver and are applicable to any user capable of tracking the L1 C/A and L2C civil signals. The paper concludes with a discussion of the application of this principle to carrier phase processing, which is an area of ongoing research. Although the analysis focuses on a partial L2C constellation, the results will be important with the upcoming launches of Galileo and Compass as well as during the phase in of L5.
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:	2530 - 2550
Cite this article:	O'Keefe, K., Wang, D., Petovello, M.G., Gernot, C., "Benefit of Partial L2C Availability for Correcting Ionospheric Error for Standalone GPS," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2530-2550.
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