Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2025, V. 22, No. 5, pp. 87-95
New approach to implementation of georeferencing procedure for MTVZA-GYa measurements
I.N. Sadovsky
1 , D.S. Sazonov
1 , A.V. Klitnaya
2 1 Space Research Institute RAS, Moscow, Russia
2 Lomonosov Moscow State University, Moscow, Russia
Accepted: 14.08.2025
DOI: 10.21046/2070-7401-2025-22-5-87-95
The paper presents a description of a new approach to implementation of the georeferencing procedure for data of the Russian scanner/sounder MTVZA-GYa (Microwave Atmospheric Temperature and Humidity Sounding Module, GYa — in memory of G. Ya. Gus’kov (1918–2002)). As part of the study, an analysis was made of the operating features of the existing georeferencing algorithm for instruments of this series. It is shown that some of the basic underlying approximations require revision, since they can be a source of additional errors in the interpretation of remote sensing data. The updated georeferencing algorithm proposes to rely on the repeatedly confirmed fact that the directions of sight of this instrument at different frequencies do not match. Thus, instead of one instantaneous observation vector, it is necessary to generate a group of vectors, each of which belongs to a fixed group of MTVZA GYa frequency channels. The corresponding changes have been made to the georeferencing software. On the basis of real measurements of the instrument operating on board the Meteor-M No. 2-4 spacecraft, the possibility of ensuring high-quality georeferencing by introducing corrective additives to the scanning cone aperture angle and azimuthal shift along its surface was demonstrated. Preliminary estimates of these angles were made for the specified version of the instrument. A comparison was made of the obtained interchannel angular displacement of MTVZA-GYa sight directions with the results of observations of the solar disk carried out by the authors earlier.
Keywords: remote sensing, microwave radiometry, microwave scanner/sounder MTVZA-GYa, spacecraft Meteor-M No. 2-4, orientation of optical sighting directions, georeferencing of remote sensing data
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