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This letter describes the task to increase the Earth imagery resolution by means of simultaneous observations from several spatially shifted linear arrays of CCD detectors. We suggest a new method which is based on the direct synthesis of the optimal filters in the spectral domain under the conditions of varying geometrical parameters of observation instead of Papoulis's generalized sampling expansion. As a result, a filtering circuit can be built in order to provide the specified resolution increase and better radiometric quality along with the fast adjustment of filter parameters within changes of observation conditions. The suggested approach has been tested using data from the Russian geostationary spacecraft 'Elektro-L'.

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ABSTRACT:Technology of prelaunch geometric calibration of multispectral imagery instruments of Russian geostationary satellites "Elektro-L" No.1 and No.2 is considered. Circular control points are used as a test field. Its geometrical model is developed to take distortions in the collimator optical system into account. Multiple observations of a test field at different angles is used to cover the full visual field of a geostationary sensor. New algorithm of circular control point detection is developed and adapted to complex geometry of geostationary imagery. It is capable of processing images formed as a set of separate scans. Under calibration, sensor design parameters and also the law of scanning mirror motion are specified. The paper contains results of the technology approval under prelaunch calibration of MSU-GS sensors for geostationary operational meteorological satellites (GOMS)