| 基于双谱滤波的综合脉冲星时算法研究 |
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| 引用本文： | 周庆勇,魏子卿,张华,刘思伟,孙鹏飞,张奋,姜坤,刘晓刚,李奎.基于双谱滤波的综合脉冲星时算法研究[J].天文学报,2021,62(2):19-95. |
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| 作者姓名： | 周庆勇 魏子卿 张华 刘思伟 孙鹏飞 张奋 姜坤 刘晓刚 李奎 |
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| 作者单位： | 地理信息工程国家重点实验室西安710054;西安测绘研究所西安710054;信息工程大学地理空间信息学院郑州450051;西安电子科技大学空间科学与技术学院西安710126;中国科学院国家授时中心西安710600;北京通信与跟踪技术研究所北京100090 |
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| 基金项目： | 国家自然科学基金项目(42004004、42074006)和国家重点研发计划(2020YFB0505800)资助 |
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| 摘 要： | 毫秒脉冲星的自转频率非常稳定,提供了一种独立的基于遥远自然天体并能持续数百万乃至数十亿年的时间基准,具有稳定性强、运行时间长、服务范围广等特点.为了减弱毫秒脉冲星计时观测中各种高斯噪声对脉冲星时的影响,研究了一种基于双谱滤波的综合脉冲星时构建算法,处理分析了国际脉冲星计时阵(International Pul-sar Timing Array,IPTA)最新发布的4颗毫秒脉冲星(PSR J0437-4715、J0613-0200、J1713+0747和J1909-3744)的观测数据,分析了不同时间尺度综合脉冲星时的稳定性,并与构成国际原子时(International Atomic Time,TAI)的4家授时单位原子钟稳定性进行了比较.结果表明:双谱滤波算法能够较好地抑制观测噪声,提高综合脉冲星时的稳定性.相比于经典加权算法,综合脉冲星时1 yr、10 yr稳定度从7.77×10-14、8.56×10-16分别提高到1.50×10-14、3.50×10-16,单脉冲星时稳定性的提升也类似.同时发现,综合脉冲星时稳定性在5 yr及以上时间尺度上优于原子钟稳定性,可用于改善当前原子时的长期稳定性.
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| 关 键 词： | 时间 脉冲星 方法:数据分析 |
| 收稿时间： | 2020/7/18 0:00:00 |
Research on Ensemble Pulsar Time Algorithm Based on Bispectral Filter |
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| ZHOU Qing-yong,WEI Zi-qing,ZHANG Hu,LIU Si-wei,SUN Peng-fei,ZHANG Fen,JIANG Kun,LIU Xiao-gang,LI Kui.Research on Ensemble Pulsar Time Algorithm Based on Bispectral Filter[J].Acta Astronomica Sinica,2021,62(2):19-95. |
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| Authors: | ZHOU Qing-yong WEI Zi-qing ZHANG Hu LIU Si-wei SUN Peng-fei ZHANG Fen JIANG Kun LIU Xiao-gang LI Kui |
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| Institution: | State Key Laboratory of Geographic Information Engineering, Xián 710054;Xián Institute of Surveying and Mapping, Xián 710054;School of Geospatial Information, University of Information Engineering, Zhengzhou 450051;School of Space Science and Technology, Xidian University, Xián 710126;National Time Service Center, Chinese Academy of Sciences, Xián 710600;Beijing Institute of Communication and Tracking Technology, Beijing 100090 |
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| Abstract: | Some millisecond pulsars rotate very stably, which can provide an independent time benchmark called pulsar time based on remote natural objects and last for millions or even billions of years. The pulsar time is characterized by the high stability, long operation time and wide service range. In order to reduce the influence of Gaussian noise on pulsar time construction in millisecond pulsar timing observation, a construction algorithm of ensemble pulsar time based on bispectral filtering is proposed. Using the observation data of four millisecond pulsars released by IPTA (International Pulsar Timing Array) to establish a pulsar time, the stability of ensemble pulsar time in different time scales is analyzed. Then, it is compared with the four atomic clocks which make up the international atomic time. The results show that the bispectral filtering algorithm can effectively reduce the influence of observation noise and improve the stability of ensemble pulsar time. The long-term observation data of four millisecond pulsars (PSR J0437-4715, J0613-0200, J1713+0747 and J1909-3744) are processed. Compared with the classical weighted algorithm, the one-year and ten-year stability of ensemble pulsar time are raised to 1.50times10-14, 3.50times10-16 from 7.77times10-14, 8.56times10-16 respectively, and the stability of single pulsar time also shows the same rule. It is also found that the five-year stability of the ensemble pulsar time is better than that of the atomic clock TAI (PTB2) of the German Physikalisch-Technische Bundesanstalt, so the pulsar can be used to improve the long-term stability of atomic time. |
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| Keywords: | time pulsars methods: data analysis |
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