Detection and Isolation of Ionospheric Fronts for GBAS

Jing Jing, Samer Khanafseh, Steven Langel and Boris Pervan

Abstract:	In this paper, a method is developed to distinguish hazardous ionospheric gradients from benign troposphere turbulence, both of which can be detected by the Ground Based Augmentation System (GBAS) ionospheric gradient monitor. Ionospheric gradients can be hazardous to aircraft using GBAS because of their potentially large extents, which can cause differential error between the ground antennas and the aircraft to accumulate. Meanwhile, tropospheric turbulence, which causes negligible differential error, can also present itself to the monitor as an ionospheric gradient and therefore trigger a false alarm. Consequently, tropospheric turbulence, while benign from an integrity perspective, will nevertheless have an adverse effect on system continuity. To remedy the situation, a supplementary ‘time interval’ monitor is developed in this work to distinguish hazardous ionospheric fronts from benign tropospheric turbulence. The new ground monitor works by observing the accumulated carrier phase error during detected large gradient events.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	3526 - 3531
Cite this article:	Jing, Jing, Khanafseh, Samer, Langel, Steven, Pervan, Boris, "Detection and Isolation of Ionospheric Fronts for GBAS," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 3526-3531.
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