Astrix 120 fiber optic gyro
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 120 is made of 4 independent closed loop FOG 120 gyroscope channels, assembled on a common baseplate.
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
Main features
- Mass 7,5 kg
- Volume 410 x 260 x h170 mm
- Power 6 W (max) per ON channel
Performances
- Bias stability 0,01°/h
- Angular random walk : 0,002°/ square-root(h)
- Scale factor 100 ppm
Benefits
- 4 independent angular rate detection axes in a skewed configuration
- high inertial performances
- 5 year continuous operation
- 15 year continuous operation for telecom version
- 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 (99-101 V for telecom option)
Environment
- Thermal : -10 to +50 °C; -30 to +70 °C (telecom option)
- Vibrations: 18.2 g RMS, 20g sine
- Shocks : 800g SRS 2000Hz/10kHz
Categories
Applications
Astrix 120 FOG can satisfy the needs of most Earth Observation & Telecom satellites.
Reference customers
CNES, ESA
