Resurs-DK1

The Resurs-DK1 was one of three subseries of the Soviet Resurs-F1 film-return Earth observation satellite family. They were a follow-on to the Fram (Zenit-4MKT) series. The Resurs-DK1 satellites were based on the Zenit-4 reconnaisance satellites. They featured a Zenit/Vostok type 2.3 m spherical reentry capsule, which housed the cameras and film, a service module, and an orbital maneuvering module. It was battery powered allowing for 14 days of operations, although up to 10 days on standby could be added. The differences between the 17F40, 17F41, and 17F43 versions are not clear. The Priroda-4 imaging system consisted of a three-channel multispectral system that includes two KFA-1000 cameras and three KATE-200 cameras. The KFA-1000 (SA-20M) cameras with 1000 mm focal length provided stereo images of up to 5 m resolution with a 60 km swath width. It had a capacity of 1800 frames.