SmallSat Star Tracker
Powerful attitude determination for small satellites. The ST400-T star tracker, developed by AAC Hyperion, is aimed at microsatellite systems. With increased attitude determination accuracy and improved radiation tolerance compared to its little brother, the ST200, it enables more demanding missions.
The ST400-T is a standalone, low mass, low power star tracker, which renders attitude determination capability to small satellites. The ST400-T is an improved version of the smaller ST200 star tracker, which is aimed at applications in pico- and nanosatellite platforms. Qualified for man-rated missions it features increased attitude determination accuracy and increased radiation tolerance. The ST400 has been qualified for man-rated missions since October 2013 and has flight heritage since 2016. Optionally AAC Clyde Space offers standard size and mission specific baffles.
The ST400-T is prepared to accept very narrow sun-exclusion angle baffles, which we can can supply on demand. The dedicated RS422/RS485 interface allows networking multiple ST400-T’s, which combined with narrow sun-exclusion angle baffles means that even for the most complex satellite and orbit geometries, there will always be a configuration that works. The ST400-T is a co-development between AAC Hyperion and Berlin Space Technologies.
The ST400 has an attitude determination accuracy of (3σ): < 10 arcseconds pitch and yaw of< 120 arcseconds roll. This high
accuracy is very good for demanding missions, larger platforms such as SmallSats.
The ST400 is prepared to accept very narrow sun-exclusion angle baffles. which AAC Clyde Space can supply on demand. The dedicated RS422/ RS485 interface allows networking multiple ST400’s, which combined with narrow sun-exclusion angle baffles means that even for the more complex satellite and orbit geometries, there will always be a configuration that works.
The ST400 comes with a RS422 interface as default. Both our Engineering and Flight model undergo workmanship testing at different levels to make sure we can deliver with our high reliability standards.
Why the ST400 Star Tracker?
- Plug-and-play ready design
- Accuracy: 10 arcseconds (3-sigma)
- Update rate: 5 Hz
- RS422/RS485 bidirectional interface
- Low power consumption: <700 mW (nominal)
- Supply voltage: 4.5V – 15.5V
- Various suitable baffle options are available on demand
- All components passed radiation qualification at 9 krad (Si)1
|Attitude determination accuracy (pitch; yaw)||10||arcseconds (3-sigma)|
|Attitude determination accuracy (roll)||120||arcseconds (3-sigma)|
|Maximum slew rate (tip/tilt)||< 0.5||°/s|
|Maximum slew rate (roll)||< 1||°/s|
|Outer dimensions||53.8 x 53.8 x 90.5||mm|
|Optional baffle sun exclusion half angle||40||°|
|Operating temperature||-20 - +40.||°C|
|Radiation tolerance||9||krad (Si)|
|Equivalent shielding thickness||≥||3 °|
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