L6 Adaptor for QZSS CLAS to Develop Smartphones Market

Izumi Mikami, Koki Asari, and Msayuki Saito

Abstract:	PPP-RTK (Precise Point Positioning in Real Time Kinematic networks) is a good way to enable cm-class positioning accuracy for both static and moving objects [1]. If we describe this method mathematically, it can be neatly expressed using linearity algebra equations, but it seems very difficult for non-professional people, including engineers of different fields. We therefore introduced the principle of PPP-RTK using simplified diagram and equations so that even non-professional people can grab the principle intuitively in some papers [2][3]. . We also introduced L6 adaptor concept and our challenge, in such papers, of L6 adaptor development which receives SSR (State Space Representation) augmentation data broadcasted from ground network. In the L6 adaptor processing, the SSR augmentation data is transformed to artificial observables with OSR (Observation Space Representation) expression at a non-physical reference point, and it roles as a replacement of reference station in RTK. This augmentation data will become available at L6 band from QZSS (Quasi-Zenith Satellite System) in Japan as open service from November,2018. This augmentation data named as CLAS (Centimeter Level Augmentation Service) [4] will be broadcasted to users from QZSS directly, and not only professional users but also mass users in and Japan are expected to enjoy a very highly accurate point positioning. . This paper discusses how to utilize CLAS in the mass market such as smartphones and wearable devices and to increase drastically the number of users who utilize the QZSS unique services. In this discussion, the development result of L6 adapter which receives CLAS from the satellites and its application scenario in the smartphones market are also described. . References [1] K. Asari, S.Matsuoka, and H.Amitani, “PPP-RTK: Centimeter-class Augmentation as Social Infrastructure,” International Symposium on GNSS 2015, Kyoto, Japan, November 2015, pp.473-478. [2] I. Mikami, K. Asari, and M. Saito, "Bridge Method between RTK and PPP-RTK by the Medium of Augmentation Data," Proceedings of the ION 2017 Pacific PNT Meeting, Honolulu, Hawaii, May 2017, pp. 917-929. [3] I.Mikami, K.Asari, and Masayuki SAITO, A New Device for PPP-RTK to Create Both Professional and Consumer Markets, 9th Multi-GNSS Asia Conference, Jakarta, Indonesia, September 2017. [4] Cabinet Office of Japan, “Quasi-Zenith Satellite System, Interface Specification, Centimeter Level Augmentation Service,” IS-QZSS-L6-001, September 2017.
Published in:	Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018) September 24 - 28, 2018 Hyatt Regency Miami Miami, Florida
Pages:	376 - 391
Cite this article:	Mikami, Izumi, Asari, Koki, Saito, Msayuki, "L6 Adaptor for QZSS CLAS to Develop Smartphones Market," Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 376-391. https://doi.org/10.33012/2018.15925
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