The Galileo High Accuracy Service (HAS): Decoding and Processing Live Corrections for Code-Based Positioning

Ciro Gioia, Daniele Borio, Melania Susi, and Ignacio Fernandez-Hernandez

Abstract:	The Galileo High Accuracy Service (HAS) is progressively reaching its maturity level and preliminary tests with live corrections broadcast through the E6B Signal in Space (SiS) were conducted in the Summer 2021. This paper describes a possible implementation of the HAS decoder, which is able to convert the raw bits broadcast through the E6B signals into actual corrections. The decoder groups different E6B pages according to their Message IDentifier (MID). When the number of HAS pages collected is equal to the message size, the decoder can finally invert the Reed-Solomon encoding scheme which is used for the message dissemination. After Reed-Solomon decoding, the original HAS message is recovered and corrections are finally extracted. A preliminary analysis of the impact of the HAS corrections on the position solution has also been performed.HAS corrections have been used to compute a Single Point Positioning (SPP) solution showing improvements with respect to standard positioning using only broadcast ephemerides and clocks.
Published in:	Proceedings of the 2022 International Technical Meeting of The Institute of Navigation January 25 - 27, 2022 Hyatt Regency Long Beach Long Beach, California
Pages:	1065 - 1074
Cite this article:	Gioia, Ciro, Borio, Daniele, Susi, Melania, Fernandez-Hernandez, Ignacio, "The Galileo High Accuracy Service (HAS): Decoding and Processing Live Corrections for Code-Based Positioning," Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, California, January 2022, pp. 1065-1074. https://doi.org/10.33012/2022.18204
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