![]() In this context, requirements on accuracy, sensitivity, and long term stability of the atmospheric water vapour observations are particularly strong since altimetry missions require a precision better than 1.4 cm in WTC (RMS) and a temporal stability better than 0.3 mm/year. ![]() To provide the observations required for the WTC is the primary role of the nadir looking Microwave Radiometer (MWR) embedded into the altimetry missions on board Sentinel-3. The spatial and temporal variability of water vapour is such that an instantaneous estimation of its impact is needed. Accurate: it benefits from a 15 years experience on every aspects of the end-to-end simulation, including the atmospheric physic, the instrumental measurements principles and the ground processingĬollaboration with Informus for Eumetsat on the definition of a wet tropospheric correction for Sentinel-3.Ī major source of uncertainty for Sea Surface Height estimates from radar altimetry is the wet tropospheric correction (WTC).Realistic: the high-resolution (~ 1 km) geophysical scenes on any surfaces are computed from the combination up-to-date NWP analysis and Radiative Transfert Model.Flexible: adaptable to any instrumental concept (CubeSat, Nadir, Imager, Sounder).The comparison between the known reference and the output from a ground prototype processing allows to quantify the expected performances of a given design and to verify if the mission requirements are satistified (Performance Analysis). ![]() ![]() For a microwave radiometer, the two critical parts are the antenna reflector and the radiometric line.īoth are tested in the frame of a realistic environment provided by accurate generation of the geophysical situation (scene generator) and detailed simulations of the measurement process (Antenna Processing and Instrument Module). Fluctus SAS is currently developping a generic solution for Microwave Radiometer End-to-end simulators.Īn end-to-end simulator is a key element in the design of a new instrumental concept. ![]()
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