基于国内宽带VLBI2010系统及iGMAS的UT1/ΔLOD数据融合方法

doi:10.12305/j.issn.1001-506X.2022.05.26

系统工程与电子技术 ›› 2022, Vol. 44 ›› Issue (5): 1644-1651.doi: 10.12305/j.issn.1001-506X.2022.05.26

基于国内宽带VLBI2010系统及iGMAS的UT1/ΔLOD数据融合方法

李西顺^1,², 吴元伟^1,^3,*, 姚当^1,², 刘佳^1,³, 马浪明^1,³, 杨旭海^1,³, 张首刚^1,⁴

1. 中国科学院国家授时中心, 陕西西安 710600
2. 中国科学院大学电子电气与通信工程学院, 北京 100049
3. 中国科学院精密导航定位与定时技术重点实验室, 陕西西安 710600
4. 中国科学院时间频率基准重点实验室, 陕西西安 710600

收稿日期:2021-06-23 出版日期:2022-05-01 发布日期:2022-05-16
通讯作者: 吴元伟
作者简介:李西顺(1995—), 男, 博士研究生, 主要研究方向为世界时UT1的解算及精度提升|吴元伟(1983—), 男, 研究员, 硕士研究生导师, 博士, 主要研究方向为世界时UT1的测定、VLBI天体测量|姚当(1990—), 男, 博士, 主要研究方向为世界时UT1的解算|刘佳(1991—), 女, 工程师, 博士研究生, 主要研究方向为VLBI数据处理|马浪明(1985—), 男, 高级工程师, 博士研究生, 主要研究方向为无限电干涉测量技术|杨旭海(1972—), 男, 研究员, 博士研究生导师, 博士, 主要研究方向为高精度时间传递与精密测轨技术、精密定轨理论与方法|张首刚(1966—), 男, 研究员, 博士研究生导师, 博士, 主要研究方向为量子频标研制
基金资助:
国家自然科学基金面上项目(12073034);中国科学院一带一路团队项目(XAB2018YDYL01)

UT1/ΔLOD data combination method with domestic broadband VLBI2010 system and iGMAS

Xishun LI^1,², Yuanwei WU^1,^3,*, Dang YAO^1,², Jia LIU^1,³, Langming MA^1,³, Xuhai YANG^1,³, Shougang ZHANG^1,⁴

1. National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences. Beijing 100049, China
3. Key Laboratory Positioning and Timing Technology, Chinese Academy of Sciences, Xi'an 710600, China
4. Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, Xi'an 710600, China

Received:2021-06-23 Online:2022-05-01 Published:2022-05-16
Contact: Yuanwei WU

摘要/Abstract

摘要：

针对国内甚长基线干涉测量(very long baseline interferometry, VLBI)观测频率不足, 导致世界时(universal time, UT1)缺乏连续性的现状, 提出将国内宽带VLBI系统(VLBI2010)解算的UT1序列及国际全球卫星导航定位系统(global navigation satellite system, GNSS)监测评估系统(international GNSS monitoring and assessment system, iGMAS)解算的日长变化ΔLOD序列进行融合, 进而得到更为连续且稳定的UT1序列。该方法的核心是将VLBI2010的UT1序列和iGMAS的ΔLOD序列通过Vondrak算法进行融合, 并结合马尔可夫链蒙特卡罗(Markov chain Monte Carlo, MCMC)模拟方法研究了不同测量精度和时间间隔的UT1序列对融合后的UT1精度依赖关系, 以及融合过程中UT1和ΔLOD最优权比的选择, 最后将融合后的数据与IERS 14 C04 UT1序列进行比对。实验结果表明, 2018年和2020年的VLBI2010系统的实测UT1序列与iGMAS的ΔLOD序列融合后, UT1的精度分别达到32 μs和51 μs, 融合后的UT1精度提升超过30%。

关键词: 世界时, 日长变化, 参考系, 数值方法

Abstract:

Due to the lack of observation frequency of very long baseline interferometry (VLBI) in China, universal time (UT1) lacks continuity, a combination approach is proposed by combining the UT1 sequence produced by the domestic broadband VLBI system (VLBI2010) and the variation of length of day ΔLOD sequence produced by the international global navigation satellite system (GNSS) monitoring and assessment system (iGMAS). The Vondrak algorithm is used to combine the UT1 sequence of VLBI2010 and the ΔLOD sequence of iGMAS. The Markov chain Monte Carlo (MCMC) simulation is used to investigate the relationship between the combined accuracy of UT1 sequences and the input measurement accuracy and time interval, and the optimization of the weight ratio between UT1 and ΔLOD. Finally, the combined UT1 sequence is compared with the IERS 14 C04 UT1 sequence. It is shown that the combination algorithm can effectively improve the accuracy of the output UT1 series: the accuracies of 2018 and 2020 UT1 series are 32 μs and 51 μs respectively. Compared with the original series, the accuracy of the combined result is improved by more than 30%.

Key words: universal time (UT1), voriation of lengthe of day (ΔLOD), reference system, numerical methods

中图分类号:

P228

李西顺, 吴元伟, 姚当, 刘佳, 马浪明, 杨旭海, 张首刚. 基于国内宽带VLBI2010系统及iGMAS的UT1/ΔLOD数据融合方法[J]. 系统工程与电子技术, 2022, 44(5): 1644-1651.

Xishun LI, Yuanwei WU, Dang YAO, Jia LIU, Langming MA, Xuhai YANG, Shougang ZHANG. UT1/ΔLOD data combination method with domestic broadband VLBI2010 system and iGMAS[J]. Systems Engineering and Electronics, 2022, 44(5): 1644-1651.

图/表 14

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统计量	采样间隔/d
统计量	1	2	3	4	5	6
权重比	16.0	4.0	2.0	0.4	0.2	0.1
标准差/μs	4.5	9.2	16.7	17.6	19.7	33.1

采样间隔/d	误差/μs
采样间隔/d	0	10	20	30	40	50	60
1	4.67	9.84	18.04	25.31	35.31	44.19	51.89
2	10.3	14.59	21.29	31.13	43.80	49.44	58.51
3	16.8	18.69	23.73	29.52	36.43	42.79	50.69
4	17.5	19.25	22.46	27.87	34.57	37.94	46.87
5	19.8	21.19	25.15	29.07	37.61	40.80	45.28
6	33.3	34.02	37.36	38.74	41.96	47.27	49.89

统计量	偏差/μs
统计量	0	10	20	30	40	50	60
标准差	4.6	4.6	4.6	4.6	4.6	4.6	4.6
均值	0.2	10.2	20.2	30.2	40.2	50.2	60.2

产品	统计特征量/μs
产品	标准差	均值	中位数	最大值	最小值
NTSC_UT1	53.18	-12.52	-9.32	79.41	-179.90
COM_UT1	31.96	-8.41	-11.70	68.91	-66.81

产品	统计特征量/μs
产品	标准差	均值	中位数	最大值	最小值
NTSC_UT1	82.51	3.64	6.54	182.68	-167.31
COM_UT1	51.04	7.91	1.48	122.05	-129.69

基于国内宽带VLBI2010系统及iGMAS的UT1/ΔLOD数据融合方法

UT1/ΔLOD data combination method with domestic broadband VLBI2010 system and iGMAS

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