Code and Carrier Phase Error Characterization under Scintillation for Future Aviation Standards using PPP Corrections

Matteo Sgammini and Ilaria Martini

Abstract:	In this paper we present a novel methodology to characterize the carrier, code, and code-carrier smoothing errors of airborne GNSS receivers under scintillation conditions and provide recommendations for the inclusion of a scintillation error budget and the associated integrity risk into the aviation standards. The method is based on raw phase observation at 1Hz rate of ionosphere-free combinations of airborne frequencies GPS L1/L5 and GALILEO E1/E5a. Carrier and code phase residuals are obtained for a static IGSMGEX reference station after applying all the corrections used in a typical PPP approach. Receiver clock and tropospheric wet component are estimated using a time differentiation of weighted carrier phase residuals. This specific characteristic has the dual advantage of removing phase ambiguities, which are supposed to be constant over a satellite pass, and offering high robustness against multipath. Scintillation events are identified, quantified, and the duration period determined by observing different scintillation indices, like the ROTI, the AATR, and S4 indexes. An extensive analysis has been performed using several IGS stations at different latitudes to ensure the representativeness of the results for different regions of the globe, within a timeframe of more than two years, starting in January 2017. A statistical analysis of the scintillation induced errors is provided and recommendations for the standardization bodies are given.
Published in:	Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019) September 16 - 20, 2019 Hyatt Regency Miami Miami, Florida
Pages:	2783 - 2795
Cite this article:	Sgammini, Matteo, Martini, Ilaria, "Code and Carrier Phase Error Characterization under Scintillation for Future Aviation Standards using PPP Corrections," Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019, pp. 2783-2795. https://doi.org/10.33012/2019.16920
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