Development of SBAS L5 and of H-ARAIM Realtime Capabilities within a DFMC SBAS GNSS Receiver

Patrick Bartolone, Joseph Griggs Collins, David Gondy, Angelo Joseph

Abstract: Horizontal Advanced Receiver Autonomous Integrity Monitoring (H-ARAIM) is an enhancement to the legacy Global Positioning System (GPS) single frequency RAIM - an airborne receiver functionality that provides protection limits, performs fault detection and exclusion on GPS satellites. The increased availability of Dual-Frequency, Multi-Constellation (DFMC) Global Navigation Satellite System (GNSS) signals is an enabler for the design, development, acceleration, standardization and certification of the HARAIM technology within the aviation domain in order to achieve worldwide availability of RNP operations with horizontal alert limit going down to 0.1 NM. This capability is particularly significant in areas currently not covered by SBAS. This paper presents the design, development and lab test activities conducted within the framework of the project known as MUlti-mode GPS and Galileo (MUGG) with a special focus on real-time implementation of H-ARAIM. The MUGG project is funded by the EUSPA (European Union Agency for the Space Programme). The objective of the MUGG project is to develop a DFMC SBAS GNSS aviation receiver with real-time SBAS L5 and H-ARAIM functions in order to validate the ED-259A MOPS ([5]) requirements currently under development. The MUGG prototype is based on an aviation certified (TSO) Collins Multi-Mode Receiver (MMR) called the GLU2100 whose hardware already integrates the DFMC growth capability. The new SBAS L5 and H-ARAIM functions are enabled via software and firmware updates to the certified baseline. The core signal processing and navigation functions within the prototype are implemented to comply with the ED-259 MOPS document. The SBAS L5 function developed in the scope of MUGG includes the SBAS L5 augmentations of dual-frequency GPS and Galileo. MUGG also adopts and prototypes a GPS and Galileo H-ARAIM algorithm compliant with the baseline performances as proposed by the Working Group C (WG-C) Service Evolution Sub-Group (SESG). The H-ARAIM algorithm relies on the broadcasted Integrity Support Message (ISM) parameters providing accuracy and integrity information for individual GNSS satellites and for the GPS and Galileo core constellations. The impact of the worst-case probabilities of GNSS satellites faults (Psat) and constellation faults (Pconst), as specified in the SARPS ([7] and [8]), on the receiver computational loading is presented and methods to reduce the H-ARAIM computational load/complexity are introduced. The prototype lab verification plans and trials to validate the SBAS L5 and Horizontal ARAIM (H-ARAIM) functions are also introduced. To conclude this paper, the results in terms of H-ARAIM performances supporting Required Navigation Performance (RNP) 0.3 and 0.1 requirements will be presented. The MUGG prototype represents a relevant step forward in the development of the DFMC SBAS user segment for aviation use.
Published in: Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021)
September 20 - 24, 2021
Union Station Hotel
St. Louis, Missouri
Pages: 1721 - 1745
Cite this article: Bartolone, Patrick, Collins, Joseph Griggs, Gondy, David, Joseph, Angelo, "Development of SBAS L5 and of H-ARAIM Realtime Capabilities within a DFMC SBAS GNSS Receiver," Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021), St. Louis, Missouri, September 2021, pp. 1721-1745. https://doi.org/10.33012/2021.17956
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