Concept
Scanning Multichannel Microwave Radiometer
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL1050/1/ | |
|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | |
| Alternative Labels | SMMR | |
| Definition | The Scanning Multichannel Microwave Radiometer (SMMR) is a 5-frequency, 10-channel microwave radiometer designed for the creation of areal sea-ice climatologies for the Arctic and Antarctic. This involves measurements of sea surface temperatures, low altitude winds, water vapour and cloud liquid water content, sea ice extent, sea ice concentration, snow cover, snow moisture, rainfall rates, and differentiation of ice types. Six conventional Dicke-type radiometers are used. Those operating at the four longest wavelengths measure alternate polarisations during successive scans of the antenna; the others, at the shortest wavelength, operate continuously for each polarisation. A two-point reference signal system is used, consisting of an ambient RF termination and a horn antenna viewing deep space. A switching network of latching ferrite circulators selects the appropriate polarisation or calibration input for each radiometer. The SMMR also contains an antenna subsystem in which a 42 degree offset parabolic reflector focuses the received power into a single feedhorn covering the entire range of operating wavelengths, and provides coaxial antenna beams for all channels. The SMMR delivers orthogonally polarised antenna temperature data at five microwave wavelengths: 0.81, 1.36, 1.66, 2.8 and 4.54 cm, at frequencies of 6.63, 10.69, 18.0, 21.0, and 37.0 GHz. https://nsidc.org/data/docs/daac/smmr_instrument.gd.html | |
| Date | None | |
| Identifier | TOOL1050 | |
| Note | accepted | |
| Is Version Of | TOOL1050 | |
| version | 1 | |
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