GPS Satellite Clock Excessive Acceleration Detection for DCPS Users of GBAS

Okuary Osechas

Abstract:	A GPS ground-based augmentation system (GBAS) is designed to detect faults and common-mode errors in dierential GPS corrections broadcast by a stationary? ground facility. This paper is focused on a speci?c fault: sudden excessive acceleration (EA) of the clock aboard a satellite, instances of which are reported to occur about once a year. Such a fault can be detected easily by the GBAS ground facility, which can warn the approaching aircraft in a timely manner. However, aircraft using these differential corrections for movement on the airport surface may be behind in receiving such messages by as much as 10 seconds due to temporary signal blockages. These users of the so-called differential correction positioning service (DCPS) of GBAS have to detect and identify such clock accelerations by themselves while on the move. This paper proposes a solution within the framework of receiver autonomous integrity monitoring (RAIM), which computes pseudorange accelerations from carrier phase measurements and tests them for consistency. It is shown that RAIM based on pseudorange accelerations can detect a hazardous EA more reliably than conventional RAIM.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2976 - 2984
Cite this article:	Osechas, Okuary, "GPS Satellite Clock Excessive Acceleration Detection for DCPS Users of GBAS," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2976-2984.
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