Constellation of 2 satellites equipped with GNSS receivers for the direct signal from GNSS and the signal reflected by the sea surface to measure sea surface winds and potential contributions to soil moisture, freeze thaw state over permafrost, inundation and wetlands, and above ground biomass.An ESA scout mission.More details here and paper here .
Note: red tag => no longer operational , green tag => operational , blue tag => planned
Satellite Programme:
Hydro Global Navigation Satellite System 