CEOS Instrument: Microwave Imaging Radiometer using Aperture Synthesis (MIRAS)

Instrument:MIRAS (SMOS)
Agency: ESA
Mission: SMOS
Type:Multi-purpose imaging MW radiometer
Description:Objective is to demonstrate observations of sea surface salinity and soil moisture in suport of climate, meteorology, hydrology, and oceanography applications.
Spatial Resolution: 33 - 50 km depending on the position in the swath - resampled to 15 km grid
Swath Width: Hexagone shape, nominal width 1050 km allowing a 3 day revisit time at the equator
Wavebands: L-Band 1.41 GHz
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:

  Ocean salinity
  Soil moisture at the surface

(select measurement name to view details)

CEOS Systems Engineering Office (SEO)

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