Benefits of Introducing Server-supported GNSS Receiver

Takahiro Yamamoto, Sho Miyamoto, Mitsuhiro Toda, Masahito Mogamiya and Kazuhiro Terao

Abstract:	Quasi-Zenith Satellite System (QZSS) started centimeter-level augmentation service (CLAS) on November 1, 2018, and the CORE Corporation developed the QZSS receiver “Chronosphere-L6” to support CLAS. Generally, GNSS receivers calculate the pseudorange using observed satellite signals, but the pseudorange has several errors, e.g. clock bias, satellite orbit bias, ionosphere delay, and troposphere delay. In CLAS, QZSS broadcasts this bias information in 5-s and 30-s intervals through the L6 band to correct the actual observation data. The QZSS receiver generates the corrected observation data with the broadcasted bias information for the virtual base station. Then, the receiver calculates the RTK centimeter-level position using the corrected observation data and the actual observation data. Since the Chronosphere-L6 has been available for sale, it has been used by customers across various fields wishing to acquire precise positioning information with less cost and labor. However, Chronosphere-L6 has had several challenges as with general GNSS receivers, e.g., fixed rate, time to first fix (TTFF), and cost. To solve the challenges, we reconsidered the efficient design of GNSS receivers with the latest technology and developed a new receiver, Chronosphere-L6S. What is the need to have all GNSS receiver functions in one box? Do users need to carry all GNSS receiver functions with them? In the ICT (Information and Communication Technology) field, the cloud service has been widespread and decreased the cost compared with the on-premise server. IoT (Internet of Things) devices connect to each other and produce new ecosystems such as a supply-and-demand management system across companies. In IoT, the cloud undertakes a part of device functions with its rich computing resources, and the functions on the cloud are shared among devices. With cloud and IoT technology, we developed ChronosphereL6S. We confirmed that a new Chronosphere-L6 can increase the fixed rate, shorten TTFF, and reduce cost.
Published in:	Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019) September 16 - 20, 2019 Hyatt Regency Miami Miami, Florida
Pages:	1908 - 1915
Cite this article:	Yamamoto, Takahiro, Miyamoto, Sho, Toda, Mitsuhiro, Mogamiya, Masahito, Terao, Kazuhiro, "Benefits of Introducing Server-supported GNSS Receiver," Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019, pp. 1908-1915. https://doi.org/10.33012/2019.17091
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