Airbus Defence and Space


Astrix 200 fiber optic gyro

A Very High Performance FOG Inertial Measurement Unit for Accuracy demanding Satellites

The Fiber Optic Gyro (FOG) is a fully static inertial measurement technology that is free of any moving part and have a much better reliability than classical mechanical gyroscope technologies.

Astrix 200 is made of 4 independent closed loop FOG 200 gyroscope channels, assembled on a common baseplate and of a separated electronics.

This configuration offers a redundancy and a failure detection capability. It improves also the nominal performances, by using 4 channels ON at the beginning of the mission (then 3 channels ON after one failure).

Features / technical details

The 4 sensing fiber optic coils are skewed and mounted in a tetrahedral Inertial Core Unit (ICU), deported from the associated Gyro Electronic Unit (GEU ).

This 4-axis configuration improves the nominal performances by using 4 channels ON at the beginning of the mission (then 3 channels ON after one failure).


  • Bias stability 0,002°/h
  • Angular random walk 0,0002°/
  • Scale factor 20 ppm
  • Mass 10 kg
  • Power 6W per ON channel


  • 4 independent angular rate detection axes in a skewed configuration
  • ICU materials compatible with optical payload
  • very high inertial performances (very low noise in particular)
  • 5 year continuous operation
  • 1553B digital interface
  • electrical stimulation capability for internal testability and SCAO ground test.


  • 1553 data bus interface (one per channel)
  • RS 422 stimuli and data interface
  • external synchronisation link interface for high accuracy time tagging
  • 21 -51V power bus


  • Thermal: ICU:+20 to +30 °C, GEU:-10 to +40 °C
  • Vibrations: 18.2 grms, 20g sine
  • Shocks: 800g SRS 2000Hz/10kHz
  • Mass: ICU: 4,5 kg, GEU: 5 kg
  • Volume: ICU: diameter 300x h260 mm, GEU: 260x200x105 mm
  • Power: 6 W max per ON channel



Earth observation satellite, accurate scientific satellite

Reference customers