I am interested in designing a robust controller for a small satellite with antenna, sloshing propellant and flexible panels on board. I am mostly interested in achieving arcsec precision pointing given such a scenario. Avoiding microvibration and jitter analysis from reaction wheels.

  • $\begingroup$ This is a super interesting question! What sensors do you imagine this using? $\endgroup$ – Knudsen Number Mar 13 at 17:28
  • $\begingroup$ Hi @Knudsen! Just the usual, nothing special. Sun sensors, magnetometers, IMU, maybe a star tracker. $\endgroup$ – Watch This Mar 14 at 19:48
  • $\begingroup$ If you are dealing with sloshing you may need something with a higher update frequency. Have you looked into Model Reference Adaptive Control (MRAC) $\endgroup$ – Knudsen Number Apr 9 at 15:42
  • $\begingroup$ Hi @KnudsenNumber! Thank you for your reply. It still is a Nanosat and, unlike CryoCube-1, has non-cryo propellant on board. The elimination of sloshing is to mitigate the last bit of arcsec numbers, amongst others micro-vibration/jitter. IMUs on board should cover the high freq sensing. Traditionally folks from the space domain have been using H-inf for GEO/Telecom sats with flexible appendages. It gives perfect support for model uncertainty. Even demonstrated marcsec precision in simulations.... $\endgroup$ – Watch This Apr 9 at 16:42
  • $\begingroup$ ....But lately for drag free attitude control of LISA mission (12DoF) people have been looking into QFT. Which is also a robust strategy. Was wondering what the differences are. I have looked into MRAC earlier for platooning of cars and velocity vector fields of UAVs, but not for arcsec flexible body pointing. What are your justifications for using MRAC for an arcsec flexible nanosat mission? Thanks for getting back at the topic ;) $\endgroup$ – Watch This Apr 9 at 16:42

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