Observing UT1‑UTC with VGOS
Artikel i vetenskaplig tidskrift, 2021

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.

VLBI intensives

VGOS twin telesc


VLBI Global Observing System (VGOS)


Rüdiger Haas

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Eskil Varenius

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Saho Matsumoto

Geospatial Information Authority of Japan

Matthias Schartner

Technische Universität Wien

Eidgenössische Technische Hochschule Zürich (ETH)

Earth, Planets and Space

1343-8832 (ISSN) 1880-5981 (eISSN)

Vol. 73 1 78


Hållbar utveckling


Annan geovetenskap och miljövetenskap

Geovetenskap och miljövetenskap



Grundläggande vetenskaper


Onsala rymdobservatorium



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