Exploring strategies for an optimal combination of mono-satellite DORIS solutions
Karine Le Bail (Chalmers University Of Technology / Onsala Space Observatory, Sweden)
Event: 2024 IDS Workshop
Session: Research activities and new applications using DORIS data, or new methods of processing DORIS data
Presentation type: Oral
DOI: 10.24400/312072/i03-2024.3920
Abstract
IDS Analysis Centers regularly process DORIS data from each individual satellite of the DORIS constellation. Contributions of the different satellites are then combined on a weekly basis, using satellite-dependent weight for the normal equations, to obtain weekly solutions for the Earth Orientation Parameters and DORIS station positions.
The GSC IDS Analysis Center uses fixed scale factors that are based on the relative difference in the SLR fits for the different satellite contributions. However, the latest contributions, based on DPOD2020 and the grgs_rl05 gravity model, show SLR fits on a similar level that does not allow to discriminate DORIS satellite contribution quality. A new strategy to determine the contribution weight of each of the satellites should be further investigated.
Focusing on the period from 2016 to 2023, we explore different strategies to optimally combine the individual satellite contributions on a weekly basis. We evaluate the results by comparing WRMS, Earth Orientation Parameters w.r.t. IERS C04, and site tie residuals.
Contribution: IDS24_s4_LeBail_CombinationMonoSatellitesSolutions.pdf (pdf, 4472 ko)
Corresponding author:
Karine Le Bail
Chalmers University Of Technology / Onsala Space Observatory
Sweden
