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Xdd = Ax + Bu
Y = Cx + Du
A and B decide if it is controllable
C and D decide if it is observable
# Controlability
- System can be uncontrollable linearly, but controllable non-linearly
## Linear Systems
1. Compute Controllability Matrix C = [B AB … A^(n-1)B]
2. If rank( C) = n <==> controllable
3. Singular value decomposition (SVD) tells us about:it orders singular vectors to show most controllable to least controllable states
- If system is controllable then:
- Arbitrary eigenvalue (pole) placementu = -Kx <==> xd = (A-BK)x
- Reachibility (get to any state in R^n)R_t = R_n
Definitions
- Reachable set R_t: all vectors in Rn that can be reached zome where sys is controllable
- Controllability Matrix: C = [B AB … A^(n-1)B]This matrix is equivalent to an impulse response in dicrete time: basically matrix says wether the control input reaches all the states eventually.
- Controllability Gramian:W_t =
- ![冖 DDzYm ](Exported%20image%2020231126171851-0.png)
- Stabilizibility: all unstable directions (eigenvectors) are controllable.
- Unstable and lightly damped directions should be controllable!

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[https://apmonitor.com/pdc/](https://apmonitor.com/pdc/)
[https://apmonitor.com/pdc/index.php/Main/ModelSimulation](https://apmonitor.com/pdc/index.php/Main/ModelSimulation)
[https://ch.mathworks.com/de/videos/tech-talks/controls.html](https://ch.mathworks.com/de/videos/tech-talks/controls.html)
Good overview of drone control
[A_review_on_drones_controlled_in_real-time.pdf](https://onedrive.live.com/embed?resid=D05036151E62BA13%213756&filename=A_review_on_drones_controlled_in_real-time.pdf&authkey=!AEvlrbu_TdPVjBw)

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==A====utomatic Control Of Aircraft & Missile ( Blakelock)==
> From <[https://archive.org/details/AutomaticControlOfAircraftMissileBlakelock/page/n79/mode/2up](https://archive.org/details/AutomaticControlOfAircraftMissileBlakelock/page/n79/mode/2up)>

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[https://ethz.ch/content/dam/ethz/special-interest/mavt/dynamic-systems-n-control/idsc-dam/Lectures/Control-Systems-2/Exercises/python-control.pdf](https://ethz.ch/content/dam/ethz/special-interest/mavt/dynamic-systems-n-control/idsc-dam/Lectures/Control-Systems-2/Exercises/python-control.pdf)
# Books
- Dynamical Systems with Applications using Python
Websites
- [https://www.eigensteve.com/](https://www.eigensteve.com/)