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Passive microwave radiometers can be grouped into two categories: conical scanning radiometers and cross-track scanning radiometers. A passive microwave radiometer is considered a conical scanning radiometer when the footprint size and earth incidence angle remain unchanged across the scan line, while a cross-track scanning radiometer has varying footprint size and earth incidence angle across the scan line.  4, fiche 1, Anglais, - conical%2Dscanning%20radiometer

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Conical scanning radiometers are characterized by a continuous instrument calibration, with the sensors passing, at every rotation, below two calibration sources: a cold-sky reflector ... and an on-board calibration target (OBCT) which provides a hot temperature reference.  5, fiche 1, Anglais, - conical%2Dscanning%20radiometer

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