面向脉冲星时的原子钟钟差研究

Research on atomic clock comparison for pulsar time

毫秒脉冲星是宇宙中稳定的“天然时钟”。毫秒脉冲星这一特性可用于建立新的时间保持基准,通过协同原子钟的短期稳定性,形成长期稳定的脉冲星时。利用40 m射电望远镜,通过观测若干颗毫秒脉冲星,研究人员开展了脉冲星计时和脉冲星钟方面的研究。目前,已经完成了相关实验平台的搭建、原子钟之间的长期比对和钟差外推等实验,成功地将贝叶斯方法应用于钟差谱估计,初步实现了钟差信号的最优估计和外推。

Millisecond pulsars are the stable“celestial clock”.Based on the properties of millisecond pulsars,a new pulsar-based time scale can be established to maintain a long-term stable timescale.Pulsar timing and pulsar clocks are investigated with several millisecond pulsars,using the Kunming 40-meter radio telescope.We had built the experimental platform of pulsar clock and carried out experiments including comparison of atomic clocks and forecast of clock differences.The validation of the Bayesian approach in clock difference spectrum estimation was verified that is proved as an effective method for clock difference estimation and extrapolation.