IVS Combination Center: Input series for ITRF2020 Update – final results

We present the final results of the IVS contribution to the ITRF2020-u2023 Update. The
original ITRF2020 covering the time span 1979 until 2020 was updated with three
additional years, i.e., adding data from 2021 to 2023. For the first time, such an extension
has been realized. The objective of such a procedure is to increase update cycles from 5–6
years to ideally only one year, in perspective.

Like the original ITRF2020 contribution, the update consists of a combined solution using
the contributions of twelve different ACs. We give an overview on the update process
and show results of station coordinates, scale, and EOPs. Our special focus is on the
performance of VGOS sessions and the scale parameter and its evolution since the
original ITRF2020.