Douglas Chinn (KBR Inc., United States); Nikita Zelensky (University of Maryland/ESSIC, College Park, United States)

The GSC analysis center recently completed its contribution to the DORIS component of ITRF2020-u2025. For this annual ITRF update, we used the wd62 series, extending the SINEX series to the end of 2025. The latest orbit standards include the COSTG-FSM gravity model as background, augmented by using SLR-geodetic-satellite-derived values for the low degree coefficients of the time-variable gravity field (C20, C21, C22, S21, S22, C30). The satellite weights for the contributing satellites were modified as described in Le Bail et al. (2025). For 2026, we have updated our processing to adopt a new DPOD2020 model as a priori (DPOD2020_052). In addition, we have adopted the AOD1B RL07 provided by the GRACE FO project. In this paper we discuss further augmentations to our processing, including initial results on SWOT processing of DORIS data with GEODYN and other modelling improvements that we identified in our review of our submission for ITRF2020-u2025.