ASTROgyro Integrated Attitude Determination System
Jena-Optronik
Integrated star tracker + gyro AOCS unit: 2x ASTRO APS star sensors + Coriolis Vibratory Gyroscopes IRU, 30 Hz output, <1/<8 arcsec star tracker accuracy, <0.005 deg/sqrt(hr) gyro ARW, TRL 9 (SES-20/21).
Technical specifications
- Configuration
- 2x AGS (star sensor) + 1x AGI (Inertial Reference Unit)
- System Update Rate
- 30 Hz
- AGS Bias Error
- <5 arcsec (full temp range)
- AGS Noise Equivalent Angle XY (1-sigma)
- <1 arcsec
- AGS Noise Equivalent Angle Z (1-sigma)
- <8 arcsec
- AGS Mass (each)
- ~2 kg
- AGI Full Scale Range
- +/-20 deg/s (coarse); +/-1 deg/s (fine)
- AGI Angle Random Walk
- <0.005 deg/sqrt(hr) per axis
- AGI Bias Instability (1-sigma)
- <0.05 deg/hr per axis
- AGI Noise Equivalent Rate
- <2 deg/hr rms (0.1-15 Hz)
- AGI Mass
- ~7.8 kg
- AGI Dimensions
- ~230 x 230 x 170 mm
- Power (cold-redundant)
- <21W nominal (1x AGS + 1x AGI)
- Power (hot-redundant)
- <54W nominal (2x AGS + 1x AGI)
- Interface
- MIL-STD-1553B, 28V power
- TRL
- 9 (flight heritage on SES-20 and SES-21)
About
The Jena-Optronik ASTROgyro is an integrated attitude determination system combining ASTRO APS star trackers (AGS units) with Coriolis Vibratory Gyroscopes in an Inertial Reference Unit (AGI). The system provides full 3-axis attitude measurement with superior performance during high slew rates and bridging during star tracker outages. Standard configuration is two AGS star sensors plus one AGI IRU in a cross-strapped hot- or cold-redundant arrangement. The AGI IRU provides 30 Hz attitude rate output with less than 0.005 deg/sqrt(hr) angle random walk and less than 0.05 deg/hr bias instability. Full ITAR-free design available. First flight on SES-20 and SES-21 geostationary satellites, TRL 9.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.
