We present first results for the determination of UT1-UTC using the VLBI Global Observing System (VGOS). During December 2019 through February 2020, a series of 1 h long observing sessions were performed using the VGOS stations at Ishioka in Japan and the Onsala twin telescopes in Sweden. These VGOS-B sessions were observed simultaneously to standard legacy S/X-band Intensive sessions. The VGOS-B data were correlated, post-correlation processed, and analysed at the Onsala Space Observatory. The derived UT1-UTC results were compared to corresponding results from standard legacy S/X-band Intensive sessions (INT1/INT2), as well as to the final values of the International Earth Rotation and Reference Frame Service (IERS), provided in IERS Bulletin B. The VGOS-B series achieves 3–4 times lower formal uncertainties for the UT1-UTC results than standard legacy S/X-band INT series. The RMS agreement w.r.t. to IERS Bulletin B is slightly better for the VGOS-B results than for the simultaneously observed legacy S/X-band INT1 results, and the VGOS-B results have a small bias only with the smallest remaining standard deviation.

我们提供使用VLBI全球观测系统（VGOS）确定UT1-UTC的第一个结果。在2019年12月至2020年2月期间，使用日本石冈的VGOS台站和瑞典的Onsala双筒望远镜进行了一系列长达1小时的观测会议。这些VGOS-B会话与标准的传统S / X波段密集会话同时进行。在Onsala太空天文台对VGOS-B数据进行了相关，后相关处理和分析。将得出的UT1-UTC结果与标准传统S / X频段密集会话（INT1 / INT2）的相应结果以及IERS中提供的国际地球自转和参考框架服务（IERS）的最终值进行比较公告B. 与标准的传统S / X波段INT系列相比，VGOS-B系列的UT1-UTC结果形式不确定度要低3-4倍。对于VGOS-B结果，与IERS公告B的RMS协议要好于同时观察到的遗留S / X波段INT1结果，并且VGOS-B结果仅在最小标准偏差的情况下具有较小的偏差。