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Instrument: PSR : Polarimetric Scanning Radiometer
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The Polarimetric Scanning Radiometer (PSR) is a versatile airborne
microwave imaging radiometer developed by the Georgia Institute of
Technology and the NOAA Environmental Technology Laboratory for the
purpose of obtaining polarimetric microwave emission imagery of the
Earth's oceans, land, ice, clouds, and precipitation. The PSR consists
of a set of five polarimetric radiometers housed within a
gimbal-mounted scanhead drum. The scanhead drum is rotatable by the
gimbal positioner so that the radiometers (Figure 2.) can view any
angle within 70o elevation of nadir at any azimuthal angle (a total of
1.32 sr solid angle), as well as external hot and ambient calibration
targets. The configuration thus supports conical, cross-track,
along-track, fixed-angle stare, and spotlight scan modes. The PSR was
designed to provide several specific and unique observational
capabilities from various aircraft platforms.

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[Adapted from the NOAA/ETL homepage]