脉冲星计时中噪声对稳定度的影响分析  

Analysis of the effect of noises in pulsar timing on the stabilities of pulsar time

作　　者：张哲浩 童明雷[1,2] 赵成仕[1,2] 朱幸芝[1,2] 刘舒 韩孟纳 ZHANG Zhe-hao;TONG Ming-lei;ZHAO Cheng-shi;ZHU Xing-zhi;LIU Shu;HAN Meng-na(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院时间频率基准重点实验室,西安710600 [3]中国科学院大学,北京100049

出　　处：《时间频率学报》2020年第3期204-213,共10页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(U1831130;U1531112);中国科学院青年创新促进会资助项目(2017450);国家自然科学基金面上资助项目(11873049)。

摘　　要：脉冲星计时中存在多种噪声,使得建立的脉冲星时稳定度受到不同程度的影响。首先利用模拟数据,分别给出了白噪声和脉冲星自转不稳定引起的计时红噪声对脉冲星时稳定度的影响。结果表明脉冲星时稳定度受计时红噪声的影响特征与理论预期一致。同时,我们采用国际脉冲星计时阵第一批发布的数据,研究了各种模型参数改正和噪声改正对脉冲星时稳定度的影响,发现计时模型参数与色散变化的影响要远大于白噪声改正。此外,通过与模拟数据的分析相比较,验证了经过各种改正后真实数据中噪声的复杂性,简单的功率谱模型并不能完全描述残差中的红噪声。The existence of various kinds of noise in pulsar timing will give impacts on the stabilities of the established pulsar time in different levels.In this paper,based on the simulated data,we firstly give the impacts of the white noise and the red noise caused by the spin irregularities on the stabilities of pulsar time.It is found that the properties of the pulsar time scale stability affected by the red noise in timing are in accord with the theoretical anticipation.Meanwhile,we use the first data set released by the International Pulsar Timing Array to study how the stability of pulsar time is affected by the corrections of timing model parameters and noises.It is found that the influences from the corrections of timing model parameters and dispersion measure variations are much more significant than those from the white noise corrections.In addition,by the comparison to the simulated data,we verify that the noise in the real data set are still complicated after various corrections,and the power-law model cannot completely describe the red noises in the residuals.

关 键 词：脉冲星计时 计时噪声 脉冲星时 稳定度 

分 类 号：P127.1[天文地球—天体测量]