The bus is
|“||the body of the satellite and is managed by the satellite control operations to maintain a desired location. It carries the payload and is composed of a number of subsystems, such as the power supply, antennas, and mechanical and thermal control equipment. The bus also provides electrical power, stability, and propulsion for the entire satellite.||”|
- ↑ Global Positioning System: A Comprehensive Assessment of Potential Options and Related Costs is Needed, at 3.