Development of the Time Management System

S. Hama, Y. Takahashi, J. Amagai, M. Fujieda, M. Nakamura, T. Takahashi, S. Horiuchi

Abstract:	This paper describes the current status of the time management system, developed by National Institute of Information and Communications Technology (NICT), for the Quasi-Zenith Satellite System (QZSS) of Japan. For the on-board system, we have developed the proto flight model (PFM). The time transfer subsystem (TTS) and the L-band transmission subsystem (LTS) were combined together for Navigation Payload tests, and then have been combined to the satellite bus for system proto flight test (PFT). The PFM of TTS was connected to the ground equipment for tests and the time difference was measured with two-way method to check its performance. For the ground system, we developed the necessary software and have carried out tests including the interface with a master control station (MCS). The time management stations (TMS) have been built at Koganei, Tokyo, where UTC(NICT) is generated, and at Okinawa. Three GEO-based two-way time and frequency transfer (TWSTFT) equipments have been installed at monitor stations in Hawaii, Sarobetsu, and Chichijima. Hawaii monitor station will also work as a TWSTFT relay station between United States Naval observatory (USNO) and NICT. Issues to be considered for QZS-TMS two-way time transfer, which is less significant for GEO-based TWSTFT, are also discussed here.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	3338 - 3343
Cite this article:	Hama, S., Takahashi, Y., Amagai, J., Fujieda, M., Nakamura, M., Takahashi, T., Horiuchi, S., "Development of the Time Management System," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 3338-3343.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In