Observability
In control theory, visible state of a system / From Wikipedia, the free encyclopedia
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For the concept in quantum mechanics, see Observable. For the concept in software, see Observability (software).
Observability is a measure of how well internal states of a system can be inferred from knowledge of its external outputs. In control theory, the observability and controllability of a linear system are mathematical duals.
The concept of observability was introduced by the Hungarian-American engineer Rudolf E. Kálmán for linear dynamic systems.[1][2] A dynamical system designed to estimate the state of a system from measurements of the outputs is called a state observer for that system, such as Kalman filters.