Galileo H-ARAIM: Update on Performance Characterization and Integrity Support Message

S. Perea, S. Wallner, M. Schönfeldt, K. Binder, M. Odriozola, A. Donatelli, E. Foucault, C. Stallo M. Sgammini, I. Martini, J.P. Boyero, M. Mabilleau, E. Canestri, N. Castrillo

Abstract:	This paper provides an update on three essential aspects related to the future support of Galileo to Advanced Receiver Autonomous Integrity Monitoring (ARAIM) service: performance assessment, system reactivity against SIS faults and Integrity Support Message (ISM) message type definition. The first part of this paper gives a detailed measurement characterization of the Galileo performance parameters relevant for ARAIM users, with particular view on URA and Broadcast Group Delay (BGD) error overbound. This work is one of the important outcomes of the Integrity Failure Mode and Effect Analysis (IFMEA) that has been established for Galileo in the frame of the Galileo Open Service Safety of Life (GoSoL) work plan set up by the European Commission. The work presented in this paper has been conducted by ESA, EUSPA and EC together with industry partners. These results are an extension of the prior work presented on [1][2][3], considering an enlargement of the observation period for Galileo of approximately 36, 24 and 12 months respectively. The additional monitoring period has corroborated the good performance on the SoL relevant parameters and the fulfillment of the target Psat, Pconst and URA as per Galileo SARPs [4] This work also focuses on the effective and rapid system reaction against two particular satellite clock events occurred on September 2021 and April 2022 and how the exposure time stayed well below one hour in both cases. The second part of this paper addresses the Galileo ISM that will be disseminated through the Galileo Signal-in-Space. This work describes the final design of the Galileo ISM message type to support H-ARAIM and introduces the new test ISM format, along with the corresponding processing logic at the user receiver. Additionally, this work will detail how the E1B I/NAV message stream broadcast by Galileo satellites, at a rate of one I/NAV word (128 bits) per 30- seconds sub-frame, can also accommodate ISM from other constellations.the E1B I/NAV message stream broadcast by Galileo satellites, at a rate of one I/NAV word (128 bits) per 30-seconds sub-frame, can also accommodate ISM from other constellations.
Published in:	Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022) September 19 - 23, 2022 Hyatt Regency Denver Denver, Colorado
Pages:	683 - 701
Cite this article:	Perea, S., Wallner, S., Schönfeldt, M., Binder, K., Odriozola, M., Donatelli, A., Foucault, E., Sgammini, C. Stallo M., Martini, I., Boyero, J.P., Mabilleau, M., Canestri, E., Castrillo, N., "Galileo H-ARAIM: Update on Performance Characterization and Integrity Support Message," Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022), Denver, Colorado, September 2022, pp. 683-701. https://doi.org/10.33012/2022.18404
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