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Results of MSU-GS Equipment Operation on the Elektro-L No. 3 Spacecraft and Prospects for its Further Development

The paper is devoted to the description of the technical evolution of the MSU-GS equipment installed on spacecraft of the Elektro-L series. The MSU-GS equipment is designed for imaging the Earth from a geostationary orbit in the visible and infrared spectral ranges with a resolution of 1 to 4 km at intervals of up to 15 minutes. The problems identified during the operation of the equipment on the Elektro-L No. 2 spacecraft are described. The main problem was the insufficient cooling of infrared photodetectors. The operation of the passive system for radiation cooling of infrared radiation detectors is described in detail. The modernization of this system made it possible to reach the required photodetector temperature values on the Elektro-L No. 3 spacecraft. The main results of MSU-GS operation on the Elektro-L No. 3 spacecraft are presented. The modernization of the equipment made it possible to significantly improve the quality of information from infrared channels in comparison with the Elektro-L No. 2 spacecraft. Much attention is paid to assessing the possibility of improving the scanning efficiency. Possible future upgrades of the MSU-GS equipment and the Elektro-L series spacecraft can improve the full Earth disk coverage characteristic to up to 5 minutes, which exceeds the characteristics of best foreign counterparts.