Modeling the Effects of Ionosphere Scintillation on GNSS Aviation Navigation Performance

Yang Liu, Yanbo Zhu, Alshaikhi Saleh Ibrahim

Abstract:	In this paper, we propose a model of ionosphere scintillation and a method for evaluating its effect on aviation navigation. Our proposed model is based on the statistical characteristic of the receiver tracking loop under ionosphere scintillation. Tracking error and mean time to lose lock (MTLL) are derived in relation to the scintillation parameter. Navigation measurement error is calculated by using a posterior Kalman filter for carrier smoothing code. We also establish a mapping mechanism between MTLL and ionosphere scintillation ratio under the assumption that receiver unlock is caused by ionosphere scintillation following Poisson distribution. The scintillation effect on navigation performance is further discussed with regard to navigation accuracy, integrity, and availability. Experiments show that the single Beidou System (BDs) constellation is prone to suffer from ionosphere scintillation, and it cannot satisfy the 99.999% availability of LPV200. Meanwhile, when BDs is combined with GPS, more visible satellites can be used under scintillation, and navigation performance is largely improved. Re-acquisition time is closely linked to navigation availability under scintillation. Given that supplementing satellites with the BDs/GPS dual constellation is greatly beneficial to navigation accuracy, integrity, and availability, the constriction of reacquisition time is relaxed from less than 1 s to 10 s to satisfy the 99.999% availability of LPV200. Supplementing the inertial system with the BDs single constellation is also examined, and the results show that INS/BDs integration improves navigation accuracy, integrity, and availability under scintillation.
Published in:	Proceedings of the 2015 International Technical Meeting of The Institute of Navigation January 26 - 28, 2015 Laguna Cliffs Marriott Dana Point, California
Pages:	545 - 553
Cite this article:	Liu, Yang, Zhu, Yanbo, Ibrahim, Alshaikhi Saleh, "Modeling the Effects of Ionosphere Scintillation on GNSS Aviation Navigation Performance," Proceedings of the 2015 International Technical Meeting of The Institute of Navigation, Dana Point, California, January 2015, pp. 545-553.
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