Building a Series of UT1-UTC from Combining the Results of Processing Hourly VLBI Sessions on the IVS Intensive Program

S. M. Mironova, S. L. Kurdubov, I. S. Gayazov

Transactions of IAA RAS, issue 58, 51–56 (2021)

DOI: 10.32876/ApplAstron.58.51-56

Keywords: Earth rotation parameters, universal time, Very Long Baseline Interferometry, analysis centers

Abstract

In this paper a combined UT1 series for hourly VLBI sessions of the IVS Intensive program for 2015–2020 years was constructed. To construct the combined series, the results of the VLBI processing of observations in the SINEX file format, obtained by various analysis centers, were collected. A number of SINEX files of the IAA RAS Analysis Center were obtained by the QUASAR software. SINEX files of BKG, GSFC, IAA RAS, USNO analysis centers were combined by the SINCOM software at the level of normal equations, and the combined UT1 series and the series of the considered analysis centers (individual series) were compared with the reference series. As reference implementations of the UT1 series, the long-term C04 series created by the IERS center and the operational “finals” series created by the USNO center were used. In the considered interval, the combined series is consistent with the individual series and with the reference series C04 and “finals”. The standard deviation between the combined series and the reference series C04 and “finals” in the interval from 2015 to 2020 years is 23 and 19 microseconds, respectively.

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