A-STR Autonomous Star Tracker
Leonardo SpA (Space Division)
Single-assembly autonomous star tracker with radiation-hardened MPP CCD: 16.4x16.4 deg FOV, 8.25 arcsec bias accuracy, 10Hz, 3.55kg, 18-year GEO lifetime, 100+ units sold.
Technical specifications
- Detector
- MPP CCD (radiation-hardened)
- FOV
- 16.4 x 16.4 deg
- Dynamic Range
- 1.5-5.5 Mi
- Max Stars Tracked
- 10
- Tracking Rate
- Up to 2 deg/s
- LiS Acquisition Time
- <6 s
- Update Rate
- 10 Hz, 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; <63 arcsec roll
- Dimensions
- 195 x 175 x 290.5 mm (40 deg SEA baffle)
- Mass
- 3.55 kg (incl. baffle, GEO shielding)
- Supply Voltage
- 20-50 V
- Power
- 8.9 W @ 20 deg C; 13.5 W @ 60 deg C
- Interface
- MIL-STD-1553B, RS-422
- Operating Temperature
- -30 to +60 deg C
- Design Lifetime
- 18 years GEO
- TRL
- 9 (100+ FMs sold since 2001)
About
The Leonardo A-STR (Autonomous Star Tracker) is a medium-FOV star tracker in a single assembly housing a radiation-hardened MPP CCD detector. Provides autonomous attitude acquisition without prior spacecraft orientation knowledge (lost-in-space in less than 6 seconds), tracking of up to 10 stars, and in-flight software reprogramming. Attitude bias accuracy is 8.25 arcsec (pitch/yaw) and 11.1 arcsec (roll) 3-sigma EOL. Update rate is 10 Hz; slew tracking up to 2 deg/s. Power supply 20-50V; power consumption 8.9W at 20 deg C. Mass 3.55 kg including 40-degree sun exclusion angle baffle and GEO shielding. Interfaces via MIL-STD-1553B or RS-422. Designed for 18-year GEO lifetime. Over 100 flight models sold since 2001 for GEO, LEO, and interplanetary missions.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.
