Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 4, pp. 27-35
Development of the calibration/validation system for microwave radiometer MTVZA-GYa observations from Meteor-M No. 2 satellite
A.B. Uspensky
1 , E.K. Kramchaninova
1 , V.S. Koscov
2 , S.A. Uspensky
1 , I.V. Cherny
3 1 SRC Planeta, Moscow, Russia
2 Saint Petersburg State University, Saint Petersburg, Russia
3 STC Kosmonit, Moscow, Russia
Accepted: 12.07.2017
DOI: 10.21046/2070-7401-2017-14-4-27-35
The system of post-launch absolute calibration and validation has been developed for observations of microwave radiometer MTVZA-GYa (module for temperature and humidity sounding of the atmosphere) onboard Meteor-M No. 2 satellite. An onboard calibration technique is used for converting the signals from MTVZA-GYa to antenna temperatures Ta. Due to various error sources the Ta values can differ from calibrated sensor brightness temperatures Tb. To derive Tb from Ta the regression methods are applied and the modeled brightness temperatures are used as reference data. The modeled brightness temperatures are calculated using two radiative transfer models (RTM) — RTM RTTOV and RTM SPbSU. The NWP products are used as input to RTM calculations. Comparison of Tb values calculated with both RTMs shows the consistency of modeling results and the ability of using them in cal/val system for MTVZA-GYa data. The results of post-launch absolute calibration of MTVZA-GYa observations in imaging/sounding channels are presented for some days in 2015.
Keywords: microwave imager/sounder, onboard and post-launch calibration, antenna and sensor brightness temperatures, radiative transfer model, emissivity, radiosonde data, numerical weather prediction
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