Wiener Filtration Algorithm of an Ensemble Pulsar Timescale Based on a Power-law Model of Pulsar Power Spectrum

doi:10.1088/1674-4527/ac8d81

NTSC-IR > 守时理论与方法研究室

	Wiener Filtration Algorithm of an Ensemble Pulsar Timescale Based on a Power-law Model of Pulsar Power Spectrum
	Yang,Ting-Gao 1,2; Tong,Ming-Lei 1,2,3; Gao,Yu-Ping 1,2,3
	2022-10-01
发表期刊	Research in Astronomy and Astrophysics
ISSN	1674-4527
卷号	22 期号:10
摘要	Abstract An ensemble pulsar timescale derived from the traditional Wiener filtration still contains some high level noise. To improve this situation we developed a Wiener filtration algorithm of the ensemble pulsar timescale based on a power-law model of power spectrum for pulsars. Our algorithm has three strengths: (1) mitigating spectral leakage between frequency bins for Fourier techniques; (2) using a power-law model for power spectrum; (3) signal realization in original residuals of data set by the power-law model. According to improved algorithm we constructed an ensemble pulsar timescale EPT?TAI using timing data with respect to International Atomic Time (TAI) about 16 yr time span of ten pulsars from International Pulsar Timing Array second data release (version A). The results show that EPT?TAI detected correctly the differences TT(BIPM2015)?TAI between terrestrial time TT(BIPM2015) and TAI. Fractional frequency stability σ z analysis shows that EPT?TAI does not indicate red noise for 16 yr time interval, and fractional frequency stability for 8 yr and longer time intervals is slightly better than that of TT(BIPM2015)?TAI. Stability for short time intervals of TT(BIPM2015)?TAI is better than that of EPT?TAI, but TT(BIPM2015)?TAI shows red noise for longer time intervals. Using the same algorithm we also derived an ensemble pulsar timescale EPT?TT(BIPM2015) with respect to TT(BIPM2015). The fractional frequency stability curve of EPT?TT(BIPM2015) shows similar characteristics as that of EPT?TAI but with slightly lower values.
关键词	(stars:) pulsars: general time methods: data analysis
DOI	10.1088/1674-4527/ac8d81
语种	英语
WOS记录号	IOP:raa_22_10_105012
出版者	National Astromonical Observatories, CAS and IOP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/14347
专题	守时理论与方法研究室
通讯作者	Tong,Ming-Lei
作者单位	1.National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China; mltong@ntsc.ac.cn 2.Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi’an 710600, China 3.University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Yang,Ting-Gao,Tong,Ming-Lei,Gao,Yu-Ping. Wiener Filtration Algorithm of an Ensemble Pulsar Timescale Based on a Power-law Model of Pulsar Power Spectrum[J]. Research in Astronomy and Astrophysics,2022,22(10).
APA	Yang,Ting-Gao,Tong,Ming-Lei,&Gao,Yu-Ping.(2022).Wiener Filtration Algorithm of an Ensemble Pulsar Timescale Based on a Power-law Model of Pulsar Power Spectrum.Research in Astronomy and Astrophysics,22(10).
MLA	Yang,Ting-Gao,et al."Wiener Filtration Algorithm of an Ensemble Pulsar Timescale Based on a Power-law Model of Pulsar Power Spectrum".Research in Astronomy and Astrophysics 22.10(2022).