Performance Analysis of the QZSS SIS-URE and user Positioning Accuracy with GPS and QZSS

Satoshi Kogure, Motohisa Kishimoto, Mikio Sawabe, and Koji Terada

Abstract:	QZSS (Quasi-Zenith Satellite System) is a Japanese space based PNT (Positioning, Navigation and Timing) system, which is being developed aiming at augmenting GPS in Japan and surrounding area. The development of QZSS is being implemented with step by step manner. As first step, the first satellite called as QZS-1 is to be launched in JFY (Japanese Fiscal Year) 2009 and technical validation and demonstrations of various applications will be carried out during one year demonstration period. The development of QZS-1 is being processed steadily. CDRs (Critical Design Review) for some of subsystems of the satellite bus were held in January, 2008 following Navigation system’s CDR ended in 2007. The manufacturing of PFM (Proto Flight Model) of NP (Navigation Payload) and procurements of components for bus system have already started. The performance analysis of the QZSS SIS-URE (Signal in Space - User Range Error) and user positioning error for combining usage of QZSS and GPS was performed for the CDR of Navigation system. All error sources of PR (Pseudo Range) in the error budget, categorized into SIS-URE, propagation error and UEE (User Equipment Error), were evaluated by simulation and analysis. From the objective of this study, SIS-URE including errors coming from interoperability with GPS and ionospheric delay correction error are emphasized in this paper, since these errors are made corrections by using parameters which provided by QZSS, i.e. depending on the system performance of QZSS. Other error sources, tropospheric delay correction error, multipath and receiver noise are explained in short description. The evaluated error budget was used for the analysis of SISURE and user positioning error in order to verify the QZSS Navigation system design. The result of analysis showed that the performance of QZSS Navigation system would surely meet its specification.
Published in:	Proceedings of the 2008 National Technical Meeting of The Institute of Navigation January 28 - 30, 2008 The Catamaran Resort Hotel San Diego, CA
Pages:	452 - 457
Cite this article:	Kogure, Satoshi, Kishimoto, Motohisa, Sawabe, Mikio, Terada, Koji, "Performance Analysis of the QZSS SIS-URE and user Positioning Accuracy with GPS and QZSS," Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, pp. 452-457.
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