For the first time of the history of the realization International Terrestrial Reference Frame (ITRF), an ITRF solution will be updated by a time extension of the DORIS, GNSS, SLR and VLBI input time series. Thus, the first update of the 2020 realization of the ITRF2020 will be estimated with space geodetic data from 1993.0 to 2024.0.
In this study, we start the evaluation of this first ITRF2020 update by comparing the mean positions and velocities, as well as the annual and semi-annual corrections of the DORIS stations from the original and updated versions of the ITRF2020. Then, we make benefit of the almost complete 2024 year to evaluate the first ITRF2020 update solution in terms of prediction of the DORIS station positions. Finally, we evaluate the impact of switching from ITRF2020 to the first ITRF2020 update while computing the DORIS terrestrial reference frame for Precise Orbit Determination (DPOD) solution.