IDS evaluation of the DORIS versions of the DGFI and IGN TRF2020 solutions

In the context of the 2020 realization of the International Terrestrial Reference Frame, the three IERS Production Centers (DGFI, IGN and JPL) delivered three independent solutions from the contributions of the four space geodetic techniques (DORIS, GNSS, SLR and VLBI). Even if these three ITRF2020 realizations are based on the same input, they differ on several points such as the space geodetic techniques weighting, the coordinate time series discontinuities and on the modelling of the station displacements.

In this study, we use the coordinate time series of the two hundred DORIS stations from 1993.0 to 2022.5 as benchmark to investigate the characteristics of the ITRF2020 and DTRF2020 realizations.

After presentation of the overall performance of these two TRF realizations in terms of geocenter, scale and mean velocities, we assess the quality of the weekly restitution of the DORIS station positions by the DTRF2020, and ITRF2020 solutions. Then, we make benefit of the one and a half year since the ending of the ITRF2020 time period to evaluate these two 2020 TRF solutions in terms of prediction of the DORIS station positions. Finally, we will estimate the impact of the DTRF2020 and ITRF2020 solutions on DORIS precise orbit determination.