why the ctrb and obsv is not full in Modal Analysis of a Flexible Flying Wing Aircraft
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here is example link
i know if the actuator can excite all mode, the system is ctrb and if the sensor can measure all mode, the system is obsv
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/699487/image.png)
this is bode plot of state space equation.
i thought from this bode plot. the sensor detect mode between 6Hz~35Hz and the actuator can excite the all of mode between 6Hz~35Hz
but the state space of the outcome of example is have 24 rank but the ctrb and obsv is just 5 rank.
why this is happend? because of unstable mode? what is unstable mode? or because of the algorithms?
please give me your knowledge
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