Fault-Free Integrity Analysis of Mega-Constellation-Augmented GNSS

Danielle Racelis, Boris Pervan, Mathieu Joerger

Abstract:	In this paper, we evaluate the potential of mega-constellation-augmented GNSS (GNSS-MC) to provide fault-free high-integrity positioning in both open sky and urban areas. We derive a method to integrate dual-frequency carrier-phase ranging measurements from GNSS at medium Earth orbit (MEO), and mega-constellations at low Earth orbit (LEO) to achieve global carrier-phase positioning. From the perspective of users on earth, LEO satellites are moving much faster than GNSS at MEO. The large angular variations generated by these fast-moving LEO satellites are exploited for rapid estimation of floating valued cycle ambiguities. The addition of mega-constellations to GNSS also improves the spatial diversity of ranging sources which enables improved navigation performance in areas where visible GNSS satellites are too few to obtain a position fix, such as in dense cities and urban canyons. This research helps identify the scope of applications potentially enabled by leveraging communication mega-constellations in safety-critical land navigation applications.
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:	465 - 484
Cite this article:	Racelis, Danielle, Pervan, Boris, Joerger, Mathieu, "Fault-Free Integrity Analysis of Mega-Constellation-Augmented GNSS," Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019, pp. 465-484. https://doi.org/10.33012/2019.16862
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