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Controllability & observability<br />

• Consider a system with state vector:<br />

(we control, actuate)<br />

System<br />

(we observe, measure)<br />

x : neither controllable nor observable in general<br />

• Controllability: How much can we control x by<br />

controlling u?<br />

• Observability: How much can we observe x by<br />

observing y?<br />

2008/09 MECH468/550P 3

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