Space complex “Resourse-F1”
The space complex “Resurs-F1” provided synchronous large-scale and multi-spectral photosurveying of the Earth surface in a visible range of electromagnetic spectrum. Gathered information was used for geodesy and cartography, exploration of the Earth natural resources, seismic activity control, water and land environment ecological control and for scientific researches and international cooperation.
Priroda-4 equipment complex consists of 3 wide aspect topographical KATE-200 devices which allows to get 3 synchronous earth’s surface images of the same area with resolution up to 15 – 20 m and two long-focal-length KFA-1000 devices for spectral imaging with resolution up to 6 – 8 m. In order to make the spacecrafts axis coordinate alignment to the stars during the earth surface photosurveing this type of star camera was used, with the help of it, it was possible to determine the geographical coordinates of the photographed earth’s surface.
In order to minimize (reduce) the development time, to conduct the tests flight, to set into service and to reduce the manufacturing costs – previously designed and approved solutions, materials and military spaceship equipment were used while constructing the “Resurs-F1” space craft.
”Resurs F-1” spacecraft can work for 25 days in the earth’s orbit, for 11 days it operates in stand-by mode, that means the positioning system and some other onboard systems are switched off. The stand-by mode allows to extend the spacecrafts orbital lifetime, provide photography of the designated earth surface areas and executes the photosurveying during the second run if the first one was a failure due to unfavorable meteorological conditions.
Shot films are delivered back to the earth by the landing vehicle. The space craft provides photosurveying of 16 million square kilometers of the Earth surface with the resolution up to 6 – 8 m and 27 million square kilometers with the resolution up to 15 – 20 m in each of the three spectrum`s range.
“Resurs-F1” type space crafts were exploited from 1979 to 1999.