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 three13-m radio telescopes located in ...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 three13-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 58.8μs.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11703033,11673051,11603001 and U1831136)the West Light Foundation of the Chinese Academy of Sciences(XAB2016A06)supported by the 100 Talents Project of the Chinese Academy of Sciences(CAS)。
文摘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 three13-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 58.8μs.
