On prescribed-time functional observers of linear descriptor systems with unknown input

ABSTRACT

This paper is concerned with prescribed-time functional unknown input observer (PTFUIO) design for linear descriptor systems. First, by constructing two identical asymptotic convergence functional observers, a new PTFUIO is developed which can achieve an exact estimation within an arbitrarily prescribed time, where both the estimation accuracy and the convergence time pre-definition are independent of the initial conditions of the original system. Also, the necessary and sufficient conditions for the existence of such the PTFUIO are given in terms of the original system matrices which are easy to examine. Finally, numerical simulations are given to illustrate the effectiveness of the proposed method.

KEYWORDS:

• Linear descriptor system
• prescribed-time observer
• functional unknown input observers
• necessary and sufficient conditions

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the China Postdoctoral Science Foundation [grant number 2019M651695] and the National Natural Science Foundation of China [grant number 61803181,61973098,61973138].