AA-STR Autonomous Star Tracker
Leonardo SpA (Space Division)
Next-gen CMOS APS autonomous star tracker: 20x20 deg FOV, 2.6kg, 5.6W, 8.25 arcsec accuracy, 10Hz, first TRL-9 CMOS star tracker. 2/3 size/weight/power of CCD units. Flight on Bepi Colombo, PRISMA.
Technical specifications
- Detector
- HAS APS (CMOS Active Pixel Sensor)
- FOV
- 20 x 20 deg
- Dynamic Range
- 1.5-5.5 Mi
- Max Stars Tracked
- 15
- Tracking Rate
- Up to 2 deg/s
- LiS Acquisition Time
- <9 s
- Update Rate
- 10/8/5/4 Hz
- Accuracy (bias, 3-sigma, EOL)
- 8.25 arcsec pitch/yaw; 11.1 arcsec roll
- NEA @ 0.1 deg/s
- <6 arcsec pitch/yaw; <49.4 arcsec roll
- Dimensions
- 164 x 156 x 348 mm (25 deg SEA baffle)
- Mass
- 2.6 kg (incl. baffle, GEO shielding)
- Supply Voltage
- 60-110 V or 20-52 V
- Power
- 5.6 W @ 20 deg C; 12.6 W @ 60 deg C
- Interface
- MIL-STD-1553B, RS-422
- SEU Tolerance
- Up to 170,000 protons/cm2/s
- Operating Temperature
- -30 to +60 deg C
- Design Lifetime
- 18 years GEO
About
The Leonardo AA-STR (Autonomous Star Tracker Advanced) is a next-generation star tracker using an HAS APS (CMOS Active Pixel Sensor) detector — the first star tracker with CMOS technology to achieve TRL 9. Approximately 2/3 the size, weight, power, and cost of conventional CCD units. Mass is 2.6 kg (including 26-degree baffle and GEO shielding); power is 5.6W at 20 deg C versus 8.9W for the A-STR. FOV is wider at 20×20 degrees, tracking up to 15 stars. Improved radiation tolerance versus A-STR (170,000 vs 17,000 protons/cm2/s SEU). Same 8.25 arcsec bias accuracy and MIL-STD-1553B/RS-422 interface. Qualified for GEO telecom, Bepi Colombo, ESA GOCE/PRISMA, AlphaBus, SpaceBus 4000 programs.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.
