Absence Tracking System in PHP

This paper deals with the filter-based H _∞ output tracking and model following control problem for a class of switched discrete-time linear systems. We don't suppose the entire knowledge of the system state to design switching laws and design tracking controllers. We only use the measured output tracking error to design the switching law, which together with the designed filter-based tracking controllers can guarantee the H _∞ output tracking problem of the closed-loop switched system is solvable. The method is proposed to ensure in the same time the H _∞ tracking and the filtering processes.