A survey of state and disturbance observers for practitioners

By Aaron Radke, Zhiqiang Gao. American Control Conference, 2006

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Active disturbance rejection control: a paradigm shift in feedback control system design (2006, background): “A simple estimation such as ˆ ˆf y u= − may very well be sufficient for all practical purposes, where ŷ denotes an estimation of y .”
Performance analysis of 2‐DOF tracking control for a class of nonlinear uncertain systems with discontinuous disturbances (2018, neutral): “8, ̇̂ e2 = −3ω(2)e (ê1 − e1) + ê3 + b̄u, ê2(0) = 0, ̇̂ e3 = −ω(3)e (ê1 − e1), ê3(0) = 0, (34)”
Performance Recovery of Feedback-Linearization-Based Designs (2008, background): “For more general systems, [20] surveys work on disturbance observers that relies essentially on linear observer theory.”
A Stability Study of the Active Disturbance Rejection Control Problem by a Singular Perturbation Approach (2009, background): “Thus the disturbance rejection problem is transformed to the disturbance observer design, a survey of which can be found in ([24]).”
Active Disturbance Rejection Adaptive Control of Hydraulic Servo Systems (2017, background): “Disturbance observer-based control has also been extensively researched to cope with large modeling uncertainties such as in [20]–[23].”