Microwave Imager instrument for MetOp Second Generation

D’Addio, Salvatore; Kangas, V.; Klein, Ulf; Loiselet, M.; Mason, G. R.; Sacchetti, A.; Lupi, T.; Tabart, C.; Bredin, C.; Bayle, F.; Vetrano, Enrico; Sidiropoulos, Nikolas

doi:10.1109/microrad.2014.6878948

Cited by 5 publications

(2 citation statements)

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“…The Micro-Wave Imager (MWI) instrument [2,3] is a conical scanning radiometer, with frequency-(18 channels) plus polarization-(vertical, horizontal) sensitive channels, covering the frequency range from 18.7 GHz to 183.3 GHz. The instrument rotates at constant speed (45 rpm), collecting microwave radiation from the Earth surface and atmosphere in several instantaneous field of view positions at each rotation, in an angular sector of ±65 degrees.…”

Section: The Mwi Instrumentmentioning

confidence: 99%

Millimeterwave reflectivity tests on MetOp-SG MWI On Board Calibration Target

Simonetto¹,

Cuttaia²,

Biggi³

et al. 2021

J. Inst.

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The On-Board Calibration Target (OBCT) for the Micro-Wave Imager instrument on the MetOp-SG-B satellite is a microwave blackbody, operating between 14 and 220 GHz (extended frequency range), providing the MWI receivers with a warm calibration reference. It is designed for an emissivity better than 0,9999 over the MWI 26 channels (including dual polarization channels). The OBCT radiometric performance has been extensively verified in ISTP (formerly IFP) microwave laboratory, by measuring reflectivity over the extended bandwidth. Measurement techniques and results are described in this paper, showing that the OBCT models tested so far are fully compliant with the MWI requirements.

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Section: The Mwi Instrumentmentioning

confidence: 99%

Millimeterwave reflectivity tests on MetOp-SG MWI On Board Calibration Target

Simonetto¹,

Cuttaia²,

Biggi³

et al. 2021

J. Inst.

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“…HE MicroWave Imager (MWI) is a conical scanning radiometer operating from 18.7 GHz to 183 GHz [1] that will be placed onboard the Metop Second Generation (SG) satellites. Its main scientific objectives are cloud and precipitation products [2], [3], snow and sea ice coverage and water vapor/temperature gross profiles.…”

Section: Introductionmentioning

confidence: 99%

Thermal Vacuum Cold Target for the Metop SG MicroWave Imager

Virone¹,

Addamo²,

Bosisio³

et al. 2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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The assessment of the Metop-SG MicroWave Imager (MWI) radiometric performance is based on a complete set of thermal vacuum tests. Such an extensive experimental campaign requires the development of large calibration targets (black bodies) with controlled systematics and low residual uncertainties. The significant size of such targets, which are based on pyramidal emitting surfaces, does not allow for a complete minimization of the thermal gradients below the required accuracy level. This work presents the modeling approach that has been developed to deal with both such thermal gradients and the proximity of the baffle. Results on the frequency dependence of the cold target brightness temperature (ECCOSORB CR-117) are reported between 18.7 and 183 GHz. The complete uncertainty budget provides 1-sigma errors levels lower than 0.22 K. The systematic effect of thermal coupling with the Earth Target has been found as relevant as the coupling to the chamber. This interdependence requires a look-up-table approach to maintain the low uncertainty levels mentioned above.

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