Functional observers design for positive systems with delays and unknown inputs.

This study addresses the problem of synthesising functional observers for positive time‐delay systems subjected to unknown inputs. A functional observer architecture for the problem is presented. The existence conditions of the observer and a linear programming problem characterising the existence conditions of such a functional observer are also established. An algorithm for designing the observer is presented. Finally, examples are given to showcase the effectiveness of the observer. [ABSTRACT FROM AUTHOR]