Time management system of the QZSS and time comparison experiments

National Institute of Information and Communications Technology, Japan (NICT) developed the time management system of the first Quasi-Zenith Satellite (QZS-1), which consisted of on-board time transfer subsystem (TTS) and related ground systems such as time management stations (TMS). TTS can measure the time differences between an on-board Rb clock and an atomic clock of the TMS. TTS can also measure the time differences between the on-board Rb clocks and the satellite reference clock, moreover between the L-band signals and the satellite reference clock. This paper describes about the time management system and shows results of a time comparison experiment between the QZS-1 and the ground TMSs using TTS.