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).
Performances
- Bias stability 0,002°/h
- Angular random walk 0,0002°/
- Scale factor 20 ppm
- Mass 10 kg
- Power 6W per ON channel
Benefits
- 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.
Interfaces
- 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
Environments
- 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
Categories
Applications
Earth observation satellite, accurate scientific satellite
Reference customers
CNES
