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).
Key figurescomparable across the catalogue
- Mass
- 2 kg
- Power
- 21 W
- TRL
- 9
Normalised to common units so this product can be compared with others in its category. The supplier's own wording is below.
As published by the supplier
- 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)
- <21 W nominal (1x AGS + 1x AGI)
- Power (hot-redundant)
- <54 W nominal (2x AGS + 1x AGI)
- Interface
- MIL-STD-1553B, 28 V 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.