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• W2764152538 abstract "Sentinel-3A, launched in February 2016, is part of ESA's long-term commitment to climate monitoring from space. Itssuite of instruments for measuring surface topography includes a Microwave Radiometer (MWR) and SRAL, the firstdelay-Doppler instrument to provide global coverage. SRAL promises fine spatial resolution and reduced noise levelsthat should together lead to improved performance over all Earth surfaces. The Sentinel-3 Mission Performance Centre(S3MPC) has been developing the methodology to evaluate the accuracy of retrievals, monitor any changes and developsolutions to known problems.The S3MPC monitors internal temperatures, path delays and the shape of the generated pulses to assess the instrumentshealth. The MWR records over known reference surfaces are compared with those from other spaceborne instruments.Over the ocean the SRAL's return pulses are analysed to give range to the sea surface, wave height and signal strength(which can be interpreted as wind speed). The metocean data are regularly contrasted with records from in situmeasurements and the output from meteorological models, which rapidly highlights the effects of any changes inprocessing.Range information is used to give surface elevation, which is assessed in three ways. First, flights over a dedicated radartransponder provide an estimate of path delay to within ~10 mm (r.m.s.). Second, measurements are compared to GPS-levelledsurfaces near Corsica and over Lake Issyk-kul. Third, there are consistency checks between ascending anddescending passes and with other missions. Further waveform analysis techniques are being developed to improve theretrieval of information over sea-ice, land-ice and inland waters." @default.
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• W2764152538 date "2017-10-03" @default.
• W2764152538 modified "2023-10-14" @default.
• W2764152538 title "Ensuring that the Sentinel-3A altimeter provides climate-quality data" @default.
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• W2764152538 doi "https://doi.org/10.1117/12.2277593" @default.
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