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Abstract:
The analysis centers of the International DORIS Service (IDS) reprocessed DORIS data from fourteen DORIS satellite from 1993 to 2021 to deliver a combined solution to the International Earth Rotation and Reference Systems Service (IERS). That IDS combined solution consists of a set of 1456 weekly solution files including station coordinates of 201 stations at 87 DORIS sites and Earth orientation parameters (EOPs). The IDS weekly combination (Moreaux et al., 2022, in press) were integrated into the different TRF realizations DTRF2020, ITRF2020, and JTRF2020. In this paper we review the DORIS performance of the three ITRF realizations. We first characterize the three realizations, comparing them to the input series IDS16, and a subsequent cumulative solution developed for precise orbit determination, DPOD2020. Next, we apply the three realizations to the orbit determination of DORIS satellites, and evaluate the POD performance. We use standard POD metrics, paying particular attention to the period 2016-2022, when the a priori ITRF realization, ITRF2014 was in extrapolation. The availability of three independent ITRF realizations affords us the opportunity to characterize the stability and consistency of the altimeter satellite orbits as far as the ITRF is concerned, particularly for those altimetry satellites that measure the change in global mean sea level (TOPEX/Poseidon, Jasons1-3, and Sentinel-6A).
