FIELD: determination of resolving power of on-board aircraft equipment. SUBSTANCE: focus target includes radiation temperature meter and reflectors of infra-red radiation located on Earth underlying surface. Reflectors form figure including at least three parallel strips and two alternating strips of background at different radiation temperature. Reflectors have light reflecting surface in form of recesses in reflector surface; recesses are made as corner reflectors adjoining each other by edges of recesses. EFFECT: reliable protection against side noise; minimum regulation of radiation temperature of infra-red focus target strips. 1 dwg
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