Is the Processing of DORIS Measurements Improved by Using the New ITRF2020-specific Station Position Modeling?

The DORIS technique is an orbitography technique based on the Doppler effect. It provides the precise real-time orbits required by all altimetry satellites and has enabled the advent of space oceanography. For optimal accuracy, it requires modeling of all the physical processes involved in the measurement and in particular knowledge of the precise coordinates of the transmitting beacons deployed on the Earth's surface. The ITRF2020, the new realization of the International Terrestrial Reference System, provides positions, velocities, annual and semi-annual terms and a modeling of possible post-seismic deformations of the geodetic stations constituting it.

Do the improvements brought by ITRF2020 lead to an improvement in the processing of DORIS measurements?

To do this, we calculated the orbits of the SPOT (2,3,4 & 5), JASON (1,2 & 3), SENTINEL (3 A & B), HY2A and SARAL satellites using as beacon coordinates the DPOD2014 (extension of the ITRF2014 produced by IDS) and the ITRF2020 by progressively integrating the different proposed models. The impact on the estimation of orbits is then discussed. Finally, we detect and discuss the influence on the results of some beacons present in the DPOD2014 and absent from the ITRF2020.