CEOS Instrument: L-band Radiometer (SMAP)

Instrument:L-band Radiometer (SMAP)
Agency: NASA
Mission: SMAP
Type:Multi-purpose imaging MW radiometer
Spatial Resolution: Radiometer has 40 km footprint
Swath Width: Soil moisture will be estimated optimally at a resolution of 10 km and freeze-thaw state at a resolution of 1-3 km. The provision of constant incidence angle across the 1000-km swath simplifies the data processing and enables accurate repeat-pass estimation of soil moisture and freeze/thaw change
Wavebands: N/A
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

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CEOS Systems Engineering Office (SEO)

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