Simultaneous state and unknown input reconstruction using cascaded high-gain observers. Issue 15 (18th November 2017)

• Record Type: Journal Article
• Authors: Saïd, S. Hadj; M'Sahli, F.; Farza, M.
• Is Part Of: International journal of systems science. Volume 48:Issue 15(2017)
• Page Start: 3346
• Page End: 3354
• Publication Date: 2017-11-18
• Subjects: State estimation -- robust estimation -- nonlinear systems -- cascade observers -- unknown input estimation; System analysis -- Periodicals; 003.3
• DOI: 10.1080/00207721.2017.1367863
• Languages: English
• ISSNs: 0020-7721

Abstract

ABSTRACT: This paper presents a systematic routine for jointly reconstruct the state variables and the unknown inputs (UIs) for a large class of nonlinear MIMO systems. After an appropriate change of state coordinates, a set of cascade high-gain observers (CHGO) are designed in such a way that each of them provides an estimation of only one component of the UI vector, except the last one which gives a final adjustment of the whole state variables. Such design achieves a boundary of the state estimation error which can be arbitrarily small by properly specifying the sole synthesis parameter. An illustrative example verifies the effectiveness of the proposed scheme.