Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 1, pp. 70-77
IR channels calibration of the MSU-MR radiometer of the Meteor-M No. 2-2 satellite
A.I. Alexanin
1 , S.E. Diakov
1 1 Institute of Automation and Control Processes FEB RAS, Vladivostok, Russia
Accepted: 12.01.2021
DOI: 10.21046/2070-7401-2021-18-1-70-77
The MSU-MR radiometer is a standard instrument of the Meteor-M satellites and an analogue of the AVHRR radiometer. The collision of the Meteor-M No. 2-2 satellite with a meteorite almost immediately after the end of flight tests did not disable the device, but required a verification of the received data calibration. The satellite also has a problem with cryprecipitation, which is deposited as a thin film on the input windows of the IR sensors and distorts the signal received. An algorithm for calculating the attenuation of a signal when it passes through films has been created. The functions of the received signal correction have been constructed. The created algorithms allowed us to make cross-calibration of the IR channels of the MSU-MR radiometer with the appropriate channels of the MODIS/Aqua radiometer. It showed high quality of the instrument data and made it possible to calculate the correction to the temperature of the cold target, which was apparently caused by the deposition of cryoprecipitates on it. An algorithm for ocean surface temperature retrieving on the base of a two-channel technique was developed. A quadratic relationship to MCSST technique was used to calculate the temperature. Comparison of satellite temperature estimates with drifting buoys measurements was carried out. The standard deviation of SST computation was 0.6 °C. The bias did not exceed 1/8 °C.
Keywords: MSU-MR, Meteor-M No.2-2, calibration, cryoprecipitation, sea surface temperature
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