Space Borne Hydrogen Maser and Time Management System for the Quasi-Zenith Satellite System (QZSS)

Shin'ichi Hama, Kazuhiro Kimura, Takao Morikawa, Yasuhiro Takahashi, Hiroyuki Ito, Hitoshi Ishida, Miho Fujieda and Michito Imae

Abstract:	Japan has started a project of Quasi-Zenith Satellite System (QZSS) since FY2003. QZSS will be highly useful not only for communications but for complement of the modernized GPS in urban canyon and mountainous area with its high visibility brought out by its inclined orbits. National Institute of Information and Communications Technology, Japan (NICT) is to develop a Space-borne Hydrogen Maser (SHM) and time management system, and carry out experiments using them. A breadboard model (BBM) of the SHM was developed to overcome the issues such as size, weight and life time. Basic design was carried out for time management system to achieve nano second level. The design and the manufacturing of the engineering models (EM) of the on-board equipment have been developed since 2004. The first satellite is planned to be launched in FY 2008.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1758 - 1763
Cite this article:	Hama, Shin'ichi, Kimura, Kazuhiro, Morikawa, Takao, Takahashi, Yasuhiro, Ito, Hiroyuki, Ishida, Hitoshi, Fujieda, Miho, Imae, Michito, "Space Borne Hydrogen Maser and Time Management System for the Quasi-Zenith Satellite System (QZSS)," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1758-1763.
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