AKA: ROS-17K. Status: Study 1983. Payload: 5,200 kg (11,400 lb). Gross mass: 22,400 kg (49,300 lb).
The spacecraft, designated ROS-7K, could be used for geophysics, astrophysics, military observations of the earth in both active and passive mode, and monitoring of enemy fleets and worldwide ship movements. Never went past preliminary design.
In 1983 NPO Energia, NPO Radiopribor (Gusev) and the NPO for Digital Equipment (Shishkin) proposed the Multipurpose Satellite Gals. The spacecraft would use the Uragan navigation system and be launched by the Zenit launch vehicle.
The man-tended satellite would be placed in a 600 km orbit at an inclination of 64.8 deg. Two crew would spend seven days at a time, repairing equipment and replenishing the spacecraft's propellant and gases. The satellite was divided into the service module and an antennae module. The 30 m diameter antennae would cover a 35 km swath of the earth with 1.5 m ground resolution. It could also be used as a radiospectrometer and radiometer in the millimeter range.
The ROS-7K would have had a total mass of 22.4 metric tons, of which 4.5 metric tons would be equipment and 700 kg the antenna. 119 square meters of solar panels would provide 15 kW of power, of which 5 to 6 kW would be available for experiments. Pointing stability was 0.006 to 0.1 deg/sec. On board storage devices would allow up to 30 days of operation without communication with the earth. The spacecraft would cover the entire earth's surface between 68 deg N and 70 deg S latitude, with a survey swath of from 100 to 900 km, and a data capture swath of from 15 to 900 km. Resolution in radiometric mode was 3 to 6 m, in radar mode 17-30 to 11-20, and astrophysical sensitivity 4 to 10 x 10^-28 w/m2/hz.
Electric System: 15.00 average kW.