DUACS (Data Unification and Altimeter Combination System) system processes data from different altimeter missions to provide a consistent and homogeneous catalogue of sea level products and derivate variables for varied applications, both for near real time (NRT) applications and offline (DT) studies.
The DUACS processing steps are summarized in the following figure.
L2P upstream data
Acquisition and data selection
Homogenization and cross-calibration
Along-track (L3) products generation
Merged gridded (L4) products generation
Derived products and quality control
To read more about the DUACS processing, you can also see Pujol et al, 2016 and Taburet et al, 2019