Analysis of the Use of Low-Pass Filters with High-Gain Observers. Issue 18 (2016)

• Record Type: Journal Article
• Authors: Khalil, Hassan K.; Priess, Stephanie
• Is Part Of: IFAC-PapersOnLine. Volume 49:Issue 18(2016)
• Page Start: 488
• Page End: 492
• Publication Date: 2016
• Subjects: High-gain observers -- Nonlinear systems -- Output feedback; Automatic control -- Periodicals; 629.805
• DOI: 10.1016/j.ifacol.2016.10.212
• Languages: English
• ISSNs: 2405-8963

Abstract

Abstract: High-gain observers play an important role in the design of feedback control for nonlinear systems. One challenge in the use of high-gain observers is the effect of measurement noise. It is shown in the literature that the presence of measurement noise puts a constraint on how high the observer gain could be, which forces a trade-off between the fast convergence of state estimates and the error due to measurement noise. A number of techniques have been proposed in the literature to attenuate the effects of measurement noise on systems utilizing a high-gain observer. In experimental applications of high-gain observers, it is quite common to use a low-pass filter to filter out the high-frequency components of the noise before feeding the measurement into the observer. In this paper we analyze effect of measurement noise on high-gain observers when low pass filters are used.