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What do i do if my control system is not observable?

  1. Apr 15, 2012 #1
    so i made a state space model of a physical system where A matrix is 4 by 4 and B matrix is 4 by 1. I have 2 inputs in the system and 1 output.

    I used Matlab to create the A,B,C,D matrices and i used the ctrb (controlability matrix), then the rank function.

    instead of rank 4 (full rank) i get rank 3. from my understanding this means my system is not fully observable. does this mean i cannot create a state space feedback with the equations and would have to go with something like fuzzy logic or PID for a feedback?
  2. jcsd
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