CEOS Instrument: Special Sensor Microwave Imager Sounder




Instrument:SSM/IS
Agencies: NOAA [Primary]
 DoD (USA)
Missions: DMSP F-16
 DMSP F-17
 DMSP F-18
 DMSP F-19
 DMSP F-20
Status:Operational
Type:Multi-purpose imaging MW radiometer
Description:Measures thermal microwave radiation. Global measurements of air temp profile, humidity profile, ocean surface winds, rain overland/ocean, ice concentration/age, ice/snow edge, water vapour/clouds over ocean, snow water content, land surface temperature.
Spatial Resolution: Varies with frequency: 25 x 17 km to 70 x 42 km
Swath Width: 1700 km
Wavebands: Microwave: 19 - 183 GHz (24 frequencies)
Technology: Multi-purpose imaging MW radiometer
Description: Radiometer operating in bands of frequency ranging from 1 to 300 GHz. A specific instrument can only cover a limited part of the range, for instance from 7 to 200 GHz. Several parameters can be observed in this range, thus the instrument is designed by optimally blending the various features. For certain parameters very low frequencies are need (e.g., 1.4 GHz for ocean salinity and soil moisture in the roots region). Several channels, of bandwidths often constrained by frequency protection regulations. The basic channels operate in atmospheric windows, but in few cases absorption channels also are added. Conical scanning is the rule, that enables constant incidence angle, thus homogeneous polarisation conditions. If full polarisation is implemented, the instrument provides sea-surface wind vector. The resolution is diffraction-limited, thus for a given antenna (e.g., diameter 180 cm) changes with frequency (e.g., from 4 to 50 km moving frequency from 90 to 7 GHz). For very low frequencies, synthetic

Measurement List:

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CEOS Systems Engineering Office (SEO)

CEOS Data Base Version: 17 - Created: 2012-01-18