毫秒脉冲星时间尺度及钟模型的研究
发布时间：2018-08-26 08:55
【摘要】：脉冲星是高速自转的中子星,有着极其稳定的自转周期,尤其是毫秒脉冲星,毫秒脉冲星周期的稳定性之高,是自然界中可与量子频标相媲美的一种天然频率源,是无须维护的天然的时钟,是可望和地面原子时系统进行比对的频率标准。毫秒脉冲星固有的内部扰动很小,自转十分稳定,对毫秒脉冲星脉冲到达时间的测量成为一项重要的观测研究,为建立独立的脉冲星时间标准提供了可行性。 本文概述了脉冲星的基本属性,探讨了脉冲星计时观测过程,重点研究了毫秒脉冲星时间尺度、脉冲星钟和综合脉冲星时,结果表明,毫秒脉冲星相对于普通脉冲星而言,更适合用于计时与导航应用。利用俄罗斯普西诺射电天文台关于脉冲星Geminga的低频计时观测资料,研究并分析其射电脉冲信号,并与以往结果比较和讨论。简要探讨了脉冲星计时处理软件Tempo2在残差拟合前的去噪过程,以及残差拟合和分析方法,通过模拟时间尺度经Tempo2处理后的结果,分析研究该处理方法对建立标准脉冲星时间尺度的影响。研究了脉冲星钟模型建立的方法,并利用最新的预报软件Polyco对毫秒脉冲星J1857+0943进行了12h的脉冲到达相位和脉冲星自转频率预报,对其最新历表的有效历元起止时间两端进行分区间段预报,讨论了钟模型预报的精度,验证了毫秒脉冲星自转频率的漂移,并作出误差分析。 利用澳大利亚国家望远镜中心PARKES射电天文台的四颗毫秒脉冲星约十年的计时观测资料,首次使用大于2颗的脉冲星实测数据建立了综合脉冲星时,评估了其稳定度,并与相关原子时时间尺度进行比较分析,讨论了改进综合脉冲星时的多种因素,及综合毫秒脉冲星时间尺度未来的应用价值和意义。
[Abstract]:Pulsars are fast rotating neutron stars with extremely stable rotation periods, especially millisecond pulsars. The pulsars have a high stability and are a natural frequency source comparable to quantum frequency standards in nature. Is a maintenance-free natural clock, is expected to be compared with the ground atomic time system frequency standards. The intrinsic internal disturbance of millisecond pulsars is very small and the rotation is very stable. The measurement of the pulse arrival time of millisecond pulsars has become an important observation study, which provides a feasibility for the establishment of independent pulsar time standards. In this paper, the basic properties of pulsars are summarized, and the observation process of pulsars is discussed. The time scales of millisecond pulsars, pulsars clock and integrated pulsar time are mainly studied. The results show that millisecond pulsars are relative to ordinary pulsars. More suitable for timing and navigation applications. Based on the low-frequency timing data of the pulsar Geminga from the Puccino radio observatory in Russia, the radio pulse signals are studied and analyzed, and the results are compared and discussed. The de-noising process of pulsar timing software Tempo2 before residual error fitting, and the method of residual fitting and analysis are briefly discussed. The results of simulation time scale after Tempo2 processing are discussed. The effect of the processing method on the establishment of the standard pulsar time scale is analyzed and studied. The method of establishing pulsar clock model is studied, and the 12 h pulse arrival phase and pulsar rotation frequency of millisecond pulsar J1857 0943 are predicted by using the latest prediction software Polyco. The interval prediction of effective epoch beginning and ending time of its latest ephemeris is carried out. The precision of clock model prediction is discussed. The drift of rotation frequency of millisecond pulsar is verified and the error analysis is made. Based on the chronological observations of four millisecond pulsars from the Australian National Telescope Center (PARKES) Radio Observatory for about ten years, the stability of the pulsars is evaluated when the measured data of more than two pulsars are used for the first time to establish a comprehensive pulsar. Compared with the relative atomic time scale, the factors of improving the integrated pulsar time are discussed, and the application value and significance of the integrated millisecond pulsar time scale in the future are discussed.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：P145.6
本文编号：2204358
[Abstract]:Pulsars are fast rotating neutron stars with extremely stable rotation periods, especially millisecond pulsars. The pulsars have a high stability and are a natural frequency source comparable to quantum frequency standards in nature. Is a maintenance-free natural clock, is expected to be compared with the ground atomic time system frequency standards. The intrinsic internal disturbance of millisecond pulsars is very small and the rotation is very stable. The measurement of the pulse arrival time of millisecond pulsars has become an important observation study, which provides a feasibility for the establishment of independent pulsar time standards. In this paper, the basic properties of pulsars are summarized, and the observation process of pulsars is discussed. The time scales of millisecond pulsars, pulsars clock and integrated pulsar time are mainly studied. The results show that millisecond pulsars are relative to ordinary pulsars. More suitable for timing and navigation applications. Based on the low-frequency timing data of the pulsar Geminga from the Puccino radio observatory in Russia, the radio pulse signals are studied and analyzed, and the results are compared and discussed. The de-noising process of pulsar timing software Tempo2 before residual error fitting, and the method of residual fitting and analysis are briefly discussed. The results of simulation time scale after Tempo2 processing are discussed. The effect of the processing method on the establishment of the standard pulsar time scale is analyzed and studied. The method of establishing pulsar clock model is studied, and the 12 h pulse arrival phase and pulsar rotation frequency of millisecond pulsar J1857 0943 are predicted by using the latest prediction software Polyco. The interval prediction of effective epoch beginning and ending time of its latest ephemeris is carried out. The precision of clock model prediction is discussed. The drift of rotation frequency of millisecond pulsar is verified and the error analysis is made. Based on the chronological observations of four millisecond pulsars from the Australian National Telescope Center (PARKES) Radio Observatory for about ten years, the stability of the pulsars is evaluated when the measured data of more than two pulsars are used for the first time to establish a comprehensive pulsar. Compared with the relative atomic time scale, the factors of improving the integrated pulsar time are discussed, and the application value and significance of the integrated millisecond pulsar time scale in the future are discussed.
【学位授予单位】：中国科学院研究生院（国家授时中心）
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：P145.6
【引证文献】
相关硕士学位论文 前1条
1 杨树启;X射线脉冲星多波段观测研究[D];中国科学院研究生院(国家授时中心);2012年
，本文编号：2204358
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