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Session D6a: Navigation in Challenging Environments 3

Integrity Monitoring of Cascading Faults in LEO-PNT Using a Dedicated ODTS Testbed
Heiko Engwerda, Royal Netherlands Aerospace Center; Francesco Menzione, European Commission - Joint Research Centre; Maarten Uijt de Haag, Flight Guidance and Air Transport Technical University of Berlin
Location: Deer Valley 1-3
Date/Time: Thursday, May. 1, 4:28 p.m.

The integration of Low Earth Orbit (LEO) constellations with Global Navigation Satellite Systems (GNSS) like Galileo requires effective integrity monitoring to mitigate cascading effects of errors. This paper investigates the potential error sources, cascading effects, and integrity monitoring strategy for augmented LEO-PNT systems. To this end, a simulation framework is developed to model the interaction between GNSS satellites, LEO satellites, and users. The results show that the proposed integrity monitor can detect and isolate the faults, ensuring the reliability and robustness of a hybrid LEO-PNT - GNSS system. The performance analysis demonstrates that the user positioning error variability and fault detection performance can be improved by the use of multiple GNSS constellations. The findings of this study provide valuable insights into the development of robust and reliable navigation solutions for LEO-PNT systems taking into account the impact on end-user applications.
Index Terms—LEO-PNT, GNSS, ODTS, P2OD, cascading faults, integrity monitoring.

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