A Luenberger observer
Definition: Luenberger observer
Terms
| Term | This example | Why |
|---|---|---|
| observer | ✓ | A Luenberger observer $\dot{\hat{x}} = A \hat{x} + B u + L (y - C \hat{x})$, for $\dot{x} = A x + B u$ and $y = C x$, is an observer when $A - L C$ is Hurwitz, because then its estimation error converges to zero. |
| estimator | ✓ | A Luenberger observer is an observer, and so an estimator, because it estimates the current state of a deterministic system from its inputs and outputs. |
| predictor | ✗ | A Luenberger observer is not a predictor, because it estimates the present, not the future. |