ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 3, pp. 51-65

Brightness temperature modeling and first results derived from the MTVZA-GY radiometer of the Meteor-M No. 2-2 satellite

G.M. Chernyavsky 1 , L.M. Mitnik 2 , V.P. Kuleshov 2 , M.L. Mitnik 2 , A.M. Sreltsov 1 , G.E. Evseev 1 , I.V. Cherny 1 
1 JSC Russian Space Systems, Moscow, Russia
2 V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
Accepted: 28.04.2020
DOI: 10.21046/2070-7401-2020-17-3-51-65
The technical characteristics of the MTVZA-GY microwave radiometer on board the Meteor-M No. 2-2 meteorological satellite, launched into a sun-synchronous circular orbit 830 km high on July 5, 2019, are considered. The radiometer measures the Earth’s outgoing radiation at frequencies ν in the range ν = 5–200 GHz while scanning through a cone at an angle of 65° to the local normal. Experimental data on the temperature variations of the hot reference load are considered, which together with the relict radiation measurements are used for internal calibration of the radiometer. Internal calibration is performed on each scan, which provides correction of gain variations and data presentation in the antenna temperature scale on vertical (V) and horizontal (H) polarizations. Calculations of the brightness temperature spectra of the Earth’s outgoing radiation on the MTVZA-GY channels are performed. As input data, the radiosonde vertical profiles of atmospheric pressure, temperature and humidity, profiles of cloud liquid water content, values of water temperature and salinity and emisivity of various earth cover types have been taken. With the use of an external calibration of MTVZ-GY at the imager frequencies was performed. Global fields of of the Earth on descending (width of a strip L = 1500 km) and ascending (L = 2500 km) orbits resulted. The fields on vertical and horizontal polarizations give an idea of the ocean surface temperature and near surface wind speed, the total atmospheric water vapor content, total cloud liquid water content and precipitation and the characteristics of cyclones, fronts and atmospheric rivers over the ocean, the distribution of sea ice and the properties of Antarctica and Greenland ice shields, the temperature of the land and vegetation cover, etc. In connection with the planned launches of subsequent Meteor-M No. 2 satellites, the need to improve the brightness temperature modeling, the development of algorithms for parameter retrieval, radiometer calibration and product validation has been emphasized. The measurement data and products should be available for users in our country and abroad.
Keywords: remote sensing, microwave radiometry, modeling, calibration, MTVZA-GY, Meteor-M No. 2-2, global fields of brightness temperatures, water vapor, cloudiness, precipitation
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