TY - JOUR
T1 - A Variable-Bandwidth Extended State Observer for Nonlinear Systems With Measurement Noise
AU - Cui, Bing
AU - Zhao, Guotao
AU - Xia, Yuanqing
AU - Wang, Pengcheng
AU - Zhang, Yonghe
N1 - Publisher Copyright:
© 1982-2012 IEEE.
PY - 2025
Y1 - 2025
N2 - In this article, a novel variable-bandwidth extended state observer (VBESO) is proposed to estimate external disturbances for a class of nth-order nonlinear systems with measurement noise. Based on the feature of "high error, high bandwidth; low error, low bandwidth,"the bandwidth of the proposed observer is adjusted automatically with the output estimation error, achieving a tradeoff between the estimation accuracy and the robustness to measurement noise. Moreover, a designed filter is introduced into the observer such that an arbitrarily small initial bandwidth can be set to alleviate the "peaking phenomenon,"and the convergence speed is improved by reducing the time constant of the filter. In addition, extensions to other kinds of observers are also established. Finally, the VBESO-based state-feedback control is presented and applied to the drag-free spacecraft hardware-in-loop experiment platform. Simulation and experiment results show that the proposed VBESO can improve the tolerance to the measurement noise and achieve a tradeoff between transient-state and steady-state performance.
AB - In this article, a novel variable-bandwidth extended state observer (VBESO) is proposed to estimate external disturbances for a class of nth-order nonlinear systems with measurement noise. Based on the feature of "high error, high bandwidth; low error, low bandwidth,"the bandwidth of the proposed observer is adjusted automatically with the output estimation error, achieving a tradeoff between the estimation accuracy and the robustness to measurement noise. Moreover, a designed filter is introduced into the observer such that an arbitrarily small initial bandwidth can be set to alleviate the "peaking phenomenon,"and the convergence speed is improved by reducing the time constant of the filter. In addition, extensions to other kinds of observers are also established. Finally, the VBESO-based state-feedback control is presented and applied to the drag-free spacecraft hardware-in-loop experiment platform. Simulation and experiment results show that the proposed VBESO can improve the tolerance to the measurement noise and achieve a tradeoff between transient-state and steady-state performance.
KW - Drag-free spacecraft (SC) system
KW - extended state observer (ESO)
KW - measurement noise
KW - state-feedback control
KW - variable bandwidth
UR - http://www.scopus.com/inward/record.url?scp=85215303337&partnerID=8YFLogxK
U2 - 10.1109/TIE.2024.3419254
DO - 10.1109/TIE.2024.3419254
M3 - Article
AN - SCOPUS:85215303337
SN - 0278-0046
VL - 72
SP - 1946
EP - 1957
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 2
ER -