The last realization of the International Terrestrial Reference System (ITRS) was computed by the three ITRS Combination Centers of the International Earth Rotation and Reference Systems Service (IERS) in 2021. The realizations are based on observations of the four space-geodetic observation techniques (i.e., GNSS, VLBI, SLR and DORIS) until the end of 2020. The ITRS realization computed at DGFI-TUM is called the DTRF2020. In 2023, the ITRS Product Center send out a call for participation for an update of the most recent ITRS realizations. In early 2024, the scientific services which coordinate the activities related to the four space-geodetic techniques provided data sets which cover the time period 2021 until 2023.
In this study, we present the current status of the DTRF2020 update with a special focus on the DORIS contribution. We discuss the provided data set (statistics, data quality, etc.) and relate the obtained solutions to the DTRF2020 and to the other submitted updates. A special highlight is put on the consistency of the submitted updates w.r.t. the ITRS 2020 realizations in terms of discontinuities, network deformations, etc.