GBAS Protection Level Calculation Method Using Particle Filter Concept

Jongsun Ahn, Sangkyung Sung, and Young Jae Lee

Abstract:	In GNSS (Global Navigation Satellite System) based navigation application, a Protection Level (PL) is supposed to guarantee the system integrity and availability. The PL is estimated a position error bound, which is a projected value of range information (pseudorange) errors, is a conservative value than unknown true position error. A range error model in a PL is assumed to be a zero mean Gaussian for simplicity purposes. However, a true range error distribution has a non-Gaussian property in general. For this reason, a marginal factor that damages system availability needs to be bound tail of error distribution[1]. In this paper, we present a protection level calculation method using a particle filter concept. A particle filter does not need to assume Gaussian property of measurement. Using the information from the particle filter (such as posteriori distribution of estimated position error with normalized weight of measurement residuals), we propose the protection level method, which satisfies the hazard misleading probability. Finally, we apply this method to protection level calculations for the real data which is obtained from the KARI GBAS Testbed in Jeju international airport of Korea.
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:	3061 - 3066
Cite this article:	Ahn, Jongsun, Sung, Sangkyung, Lee, Young Jae, "GBAS Protection Level Calculation Method Using Particle Filter Concept," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 3061-3066.
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