Sentinel-3 Next Generation Topography Phases B2/C/D/E1 Reference number: 1-12967

f two identical satellites (A- and B-units) flying in a 817 km, sun-synchronous dawn-dusk orbit, following the same ground track pattern as the Sentinel-3 first generation. Each satellite will embark a nadir altimeter, Poseidon-5 (POS-5), a Swath Altimeter for Operational Oceanography and Hydrology

(SAOOH), and a multi-beam, multi-channels microwave radiometer (MWR). POS-5 is an evolution of the Ku- and C-band Poseidon-4 nadir altimeter embarked on-board Sentinel-6, that has demonstrated a breakthrough in performance in comparison wit