Subjects: Astronomy >> Astrophysical processes submitted time 2022-11-01 Cooperative journals: 《天文研究与技术》
Abstract: Time-frequency data resources are important national information resources. The design of the time-frequency data platform relies on the time-frequency data generated by the daily operation of the National Time Service Center, the bulletin issued by Bureau International Des Poids et Mesures (BIPM) and International Earth Rotation and Reference Systems Service(IERS).The data platform can provide abundant data resources for the research of time-keeping technology. This paper first introduces the construction of the time-frequency data platform, and then uses the local time-keeping system comparison and long-distance link comparison data collected by the data platform to carry out time-keeping technology research, including the evaluation of the state of the atomic clock, and the analysis of the abnormal jump of the atomic clock. For different types of clock keeping, analyze and compare the performance indicators of atomic clocks such as fluctuation and stability, and conduct clock error prediction research based on the ARIMA model. The research contents of those different aspects can provide important reference for the continuous and reliable operation of the time-keeping system.
Subjects: Astronomy >> Astrophysical processes submitted time 2021-03-30 Cooperative journals: 《天文研究与技术》
Abstract:脉冲星周期跃变是一种罕见的现象,是研究其内部结构的探针。针对2019年2月至12月,国家授时中心昊平观测站40米射电望远镜在脉冲星计时观测中,监测Crab脉冲星的数据,采用脉冲星计时方法,用TEMPO2拟合程序进行分析。结果表明Crab脉冲星在2019年7月23日(MJD58687)附近发生了一次周期跃变现象,该跃变自转增量为 ∆vg = 5.33(4)×10-7 Hz,自转变化量为 ∆vg /v = 17.9(1)×10-9 ,并伴随着恢复系数Q ~ 0.88的指数恢复过程。此次Crab脉冲星周期跃变的监测及处理,证实了国家授时中心40米射电望远镜对脉冲星的监测性能,同时为研究周期跃变的产生机理积累了样本。