What is an excitation signal in closed loop control?

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Hans 2020-7-27
Breifly my title is my actual question, but if you need nore info below is my full description.
**** The example here is Magnetic Levitation of a ball****
The system is unstable so a closed loop control is implemented to stabilize the system.
But in case of real time model identification open loop identification is not possible, so we need to implement a closed loop identification. This result in implementation of excitation signal.
** The info I read about excitation signal and I did not get it**
In closed loop identification the controller introduces a output noise and control signal correlation, which leads to model corruption. This correlation can be broken by introducing an additional excitation signal.()

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