The spacecraft bus

Here are the main features of the Myriade spacecraft bus:

CAD representation

• Structure:
  
  • typical technological structure (aluminium, NIDA, etc.),
  • passive thermal control (paint, insulation blankets, heaters, etc.).

• Power supply:
  
  • 2-pannel solar array with 24.5% efficiency (up to 180 W with maximum sun exposure) complete with drive mechanism to ensure continuous rotation
  • 13.5 Ah Li-ion battery
  • power regulation and distribution unit

• Satellite orientation control:
  
  • sensors: solar tracker, magnetometer, star tracker, gyrometer
  • actuator: magnetorquers, reaction wheels, hydrazine propulsion system
  • a coarse pointing mode (accurate to 5 to 10°) and a fine pointing mode (0.1°)
  • different pointing types available: Earth, Solar, inertial, etc.

• Computing and telemetry/remote control link:
  
  • CNES-designed computer (T805 processor + microcontrollers) with 1 Gb storage
  • 400 kbps telemetry and 20 kbps remote control unit operating with CCSDS protocol, 2 GHz RF S-band link
  • onboard time-keeping (accurate to 0.1 s)
  • storage (8 to 16 Gb) and high-speed downlink (16.8 Mb/s) for scientific telemetry, X-band RF link (8 GHz)
  • payload capacity of up to 55 kg and 55 W.