An Approach to Observer Design

In the last decade the behavioral point of view [8, 11, 12] has received an increasingly broader acceptance as an approach for modeling dynamical systems, and now is generally viewed as a cogent framework for system analysis. One of the reasons of its success has to be looked for in the fact that it does not start with the input/output point of view for describing how a system interacts with its environment, but focuses on the set of system trajectories, the behavior, and hence on the mathematical model describing the relations among all system variables.