The NTSC VLBI System and its application in UT1 measurement
The NTSC VLBI System and its application in UT1 measurement
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NTSC VLBI系统及其在UT1测量中的应用
DOI：
10.1088/1674-4527/20/6/93
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发表时间：
2020
影响因子：
1.8
通讯作者：
Yang Xu-Hai
中科院分区：
文献类型：
--
作者：
Yao Dang;Wu Yuan-Wei;Zhang Bo;Sun Jing;Sun Yan;Xu Shuang-Jing;Liu Jia;Ma Lang-Ming;Gong Jian-Jun;Yang Ying;Yang Xu-Hai
为了实现世界时（UT 1）的真实的实时测量，国家授时中心在吉林、三亚、喀什等地建立了VLBI宽带观测网，并在西安建立了数据分析中心。每个观测站都配备了一个高度稳定的氢原子钟和一个自主开发的VLBI后端，并与两个GPS接收机共址。该VLBI网将对提高我国宽带VLBI技术水平和对UT 1的VLBI测量做出重要贡献。本文介绍了该VLBI网的技术指标，并介绍了2018年利用该网吉林-喀什基线进行的C波段UT 1测量。通过与IERS提供的UT 1值的比较表明，该观测网能够确定UT 1的精度为58.8 μs。
In order to measure the Universal Time (UT1) in real time, National Time Service Center (NTSC) has built a VGOS-like (VLBI Global Observing System) broadband VLBI network, which includes three 13-m radio telescopes located in Jilin, Sanya and Kashi, and a data analysis center in Xi’an. Each station is equipped with a highly stable hydrogen atomic clock and a self-developed VLBI backend, and is colocated with two GPS receivers. This VGOS-like VLBI network may play an important role in improving the Chinese broadband VLBI technology and making valuable contributions to domestic VLBI measurements of UT1. In this paper, we introduce the specifications of this VLBI network, and present the UT1 measurements at C-band conducted in 2018 using the Jilin-Kashi baseline of this network. The comparisons between our UT1 estimates and those provided by IERS suggest that the NTSC VLBI network is capable to determine UT1 accurate at the level of 58.8 μs.