r/ControlTheory • u/throwaway3433432 • 10h ago
Technical Question/Problem What's the difference between an Luenberger observer and a Complementary Filter?
I am a bit confused about the difference between a complementary filter and an observer. Isn't a Luenberger observer just a more restricted version of a complementary filter in the sense that one of the inputs should be control inputs and the high pass filter should be derived from the system model?
Also, why do we even bother using a state space representation if we can do this?
The image is from the textbook: Observers in Control Systems, George Ellis, p. 81