Ciro Gioia, Daniele Borio, Melania Susi, European Commission, Joint Research Centre (JRC), Italy; Ignacio Fernandez-Hernandez, European Commission, DG DEFIS, Belgium

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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.