Review on research progress of ensemble pulsar time-scale

被引：0
|
作者：
Yang T. [1 ,2 ]
Gao Y. [1 ,2 ,3 ]
Tong M. [1 ,2 ]
Li B. [1 ,2 ]
Zhao C. [1 ,2 ]
Luo J. [1 ,2 ]
Zhu X. [1 ,2 ]
Wei F. [1 ,3 ]
机构：
[1] National Time Service Center, Chinese Academy of Sciences, Xi’an
[2] Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi’an
[3] School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 03期
基金：
中国国家自然科学基金;
关键词：
astrometry; millisecond pulsar; pulsar time-scale; pulsar timing array; time scale;
D O I：
10.7527/S1000-6893.2022.26443
中图分类号：
学科分类号：
摘要：
Now generalized least square fitting and a Bayesian approach to pulsar timing analysis are successfully used. An introduction on these two methods for pulsar timing analysis is provided. Up to today，three kinds of algorithms of constructing an ensemble pulsar time-scale using millisecond pulsar timing data were developed，which were the generalized least square fitting algorithm，the Bayesian analysis technology and the optimal Wiener filtration. We describe the above three algorithms in some details，and show some derived representative results on Ensemble Pulsar Time-scale（EPT）already published and results that we recently derived using improved Wiener filtration from International Pulsar Timing Array（IPTA）data release 2. All the results showed here indicate that the EPT with respect to the International Atomic Time scale（TAI）detected correctly the systematic errors in the TAI. Frequency stability analysis for the ensemble pulsar time-scale EPT-TAI we developed，as an example，indicates that the frequency sta⁃ bility on 8 year and longer time intervals show a little better secular stability than the TT-TAI. The TT-TAI is difference between Terrestrial Time scale（TT）and TAI. Quadratic term in the TT-TAI is removed to make a comparison with pulsar time-scale. Based on the frequency stability analysis，It is clear that TT-TAI shows some red noise，while there is no red noise detected in the EPT-TAI. Finally，we summarize the three algorithms on constructing an ensemble pul⁃ sar time scale. The question on improving short time interval stability of pulsar time-scale is discussed. Some prelimi⁃ nary conclusions on EPT research work are given. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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