A-STR Autonomous Star Tracker
Description
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.
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) |
