11. Recursive Estimation Methods
11.1 Introduction
In many cases it is necessary, or useful, to have a model of the system available on-line while the system is in operation. The model should then be based on observations up to the current time. The need for such an on-line model construction typically arises since a model is required in order to take some decision about the system. This could be
• Which input should be applied at the next sampling instant?
• How should the parameters of a matched filter be tuned?
• What are the best predictions of the next few outputs?
• Has a failure occurred and, if so, of what type?
Methods coping with such problems using an on-line adjusted model of some sort are usually called adaptive (see Figure 11.1 ...
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