毫秒脉冲星定时研究进展

Research Progress on Metrological Uses of High PrecisionMillisecond Pulsar Timing Data

毫秒脉冲星守时的理论和方法研究己取得重要进展,利用现有2颗毫秒脉冲星约10yr的计时观测资料分析得到的 TAI-PT,其长期稳定度为 2×10－14。采用合适的长期稳定度算法,由多颗毫秒脉冲星计时观测可以建立综合脉冲星时间尺度。它可以成为与原子时系统比较的重要手段,并对原子时长期稳定度的改进做出贡献。介绍了该领域研究的基本状况,重点对毫秒脉冲星守时的理论方法,综合脉冲星时间及与原子时的关系等进行了讨论和评述。对由双星系统内毫秒脉冲星的轨道运动定义的双星脉冲星时也做了介绍。

We reviewed the research progress on time keeping metrology using millisecond pulsars.Millisecond pulsars exhibit a very stable spinning period, so that their rotational phase may beused as a time reference, named pulsar time (PT). The analyses of high precision timing datafor two millisecond pulsars showed that the long-term stability of TA - PT may be compared toatomic time TA. It is possible that an average pulsar time scale PTens may be deduced through along-term stability algorithm using precision timing data from more millisecond pulsars. Such anensemble average can reduce the level of the instabilities originating from individual pulsar andother sources of noise. By comparison between ensemble pulsar time and terrestrial atomic time,one will get some insight on long term stability of atomic time. The orbital motion of close binarypulsar can be used for generation of an astronomical ephemeris time scale BPT. An introductionon the definition of binary pulsar time BPT was given.