Increase of the Earth’s orientation parameters combination accuracy in Main Metrological Center of State Service for time, frequency and Earth’s orientation parameters evaluation

Abstract

The results of improvement of programs and methods of Earth’s orientation parameters (EOP) combination of vary long baseline interferometry (VLBI), global navigation satellite systems (GNSS) and satillite laser ranging (SLR) in Main Metrological Center of State Service for Time, Frequency and Earth’s orientation parameters evaluation are considered. Nowdays, the combination of different geodetic thecnics measurements in Main Metrological Center of State Service for time, frequency and Earth’s orientation parameters evaluation is provided both at the time raws level, and on the observations level. The increasing accuracy of Universal time UT1 was caused by using in combination observational data from new thirteen-meter antennas of the two-element very long base interferometer which was created in Institute of Applayed Astronomy of Russian Academy of Science. In general, increase in accuracy of combination values of the Earth’s orientation parameters was caused both by the increase in accuracy of the separate time raws, and by the improving of the combination algorithms.