Universal Space Platform

The Universal Space Platform was developed by S.P. Korolev RSC Energia within the Yamal project. It has gone flight qualification as a part of the Yamal-100 communication satellite launched on September 6, 1999. Using the Universal Space Platform as the basis, RSC Energia provides activities in any scope:

• development and turn-key of communication systems and Earth remote sensing (ERS) systems as a whole;
• development and launch of different-purpose satellites;
• platform adaptation as a part of specific space vehicle of another developer.

MAIN CHARACTERISTICS
Working orbits	Low (including SSO), middle, HEO, GEO
Dry space platform (SP) mass	950:1200 kg
Payload (PL) mass: for low, middle, high-elliptical orbits for GEO	500:1000 kg 250:300 kg
PL electric power: for low, middle, high-elliptical orbits for GEO	up to 3000 W 2200 W
Attitude control	Three-axial
SP attitude control accuracy	3:6 min of arc
Stabilization accuracy: - in angle - in angular rate	1 min of arc 0.001...0.002 deg of arc/s
Nominal voltage	28.5 V
Flight service life for low, middle, high-elliptical orbits for GEO	at least 7 years up to 12.5 years

SSO - Sun-synchronous orbit
HEO - High-elliptical orbit
GEO - geostationary orbit

Key features of the Multi-purpose Satellite Bus

• No pressurized compartments traditionally used in satellites.
• Compartments, solar array panels, on-board antennas made of sandwiched honeycomb structures based on composite materials.
• Power supply system based on solar arrays and Ni-H storage batteries.
• Passive thermal control system using heat pipes.
• Motion control system based on optical sensors, high-precision angular rate meters and momentum wheels.
• Electrical propulsion unit operating on xenon (liquid- and gas-based are also possible).
• A single on-board control system based on an advanced computer system which provides a functional unity for all on-board systems is redundant, and is easily adapted to the requirements of the specific payload installed on the bus through the use of specialized software.
  

The key feature of the design is a pronounced modularity assuring high manufacturability and ease of the integration and testing of the Multi-purpose Satellite Bus-based spacecraft