IDS contribution to the third update of the ITRF202

The International DORIS Service (IDS) has contributed to the third annual update of the 2020 realization of the International Terrestrial Reference Frame (ITRF2020). As part of this effort, IDS has estimated DORIS station positions and velocities, as well as Earth Rotation Parameters (ERPs), using DORIS data. These computations are based on the latest weekly multi-satellite series from the five IDS Analysis Centers and an IDS Associated Analysis Center, covering data from 2025 and backward 2021. Note that for the first time, the IDS combined series will include daily LOD (Length-Of-Day) estimates.The primary objectives of this study are to evaluate the DORIS contribution to this update of the ITRF2020 in terms of: (1) geocenter motion and scale, (2) station positions and week-to-week position repeatability, (3) ERPs, and (4) a cumulative position and velocity solution. A particular focus is placed on the LOD estimates and on the impact of including SWOT (Surface Water Ocean Topography) DORIS data.