A New Modeling Scheme of Satellite Ephemeris and Clock Errors for Korean WADGPS Test Bed

Doyoon Kim, Ho Yun, Kyoungho Sohn, Changdon Kee

Abstract:	This paper presents alternative modeling schemes for satellite-induced errors of GPS including ephemeris and clock errors which can be applied to an implementation of a wide area differential system in such a small area like the Korean region. We also discuss an estimation process based on Kalman filtering using the proposed error models. We propose alternative correction generation algorithms which are basically based on the extended Kalman filtering. For the time propagation, we propose two types of the error dynamics model. One is to model satellite-induced errors as sinusoidal periodic functions. For this purpose, we analyze the properties of the errors using broadcast ephemerides and IGS (International GNSS Service) precise orbits. The other is to use satellite orbit dynamics which are the core elements of precise orbit determination (POD). However, our scheme is different from the POD because we just use them to construct the error dynamics model for the time propagation process. We analyze the performance of the proposed schemes by simulations using real-data. To analyze the satelliteinduced errors separated from the other error sources and to make the simulations become more realistic, we generate the simulated data using broadcast ephemerides and IGS precise orbits. The analysis results show that the proposed algorithms can be successfully applied to the correction generation for WADGPS in Korean region.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	1929 - 1937
Cite this article:	Kim, Doyoon, Yun, Ho, Sohn, Kyoungho, Kee, Changdon, "A New Modeling Scheme of Satellite Ephemeris and Clock Errors for Korean WADGPS Test Bed," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 1929-1937.
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