Scott Manley | How Failed Gyros Are Making Hubble's Life Harder @scottmanley | Uploaded 3 months ago | Updated 17 hours ago
After decades of operation on orbit, the Hubble Space Telescope is now missing critical hardware which was required in its original design. Three Gyroscopes are supposed to be needed, so the telescope launched with 6, but they keep failing and now there are only two.
However, engineers have come up with new control algorithms to allow operation with fewer gyroscopes, and this is what I want to explain.


NASA's explanation of the process
https://science.nasa.gov/mission/hubble/observatory/design/hubble-one-gyro-mode/

The scientific paper on these new control laws:

HUBBLE SPACE TELESCOPE REDUCED-GYRO CONTROL LAW
DESIGN, IMPLEMENTATION, AND ON-ORBIT PERFORMANCE
https://ntrs.nasa.gov/api/citations/20080023344/downloads/20080023344.pdf

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