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The most key component toward an emerging control technology known as active disturbance rejection control is the extended state observer (ESO) which is a systematic design to realize total disturbance estimation via observable measured output. There are, however, two limitations in design of ESO: a) the high gain must be resorted, and closely with b) the derivative of total disturbance is necessarily...
For nonlinear differential-algebraic equations system which satisfies linear growth condition and is of index one, this paper shows that there exists an appropriate sampling period such that the problem of sampled-data output feedback stabilization control can be solved. A linear explicit non-initialized observer is proposed, which means that the initial states of the observer are not necessarily...
A class of new type of observers for second-order dynamic systems named proportional plus second-order derivative (P2D) observers are proposed in this paper and their forms are given. Based on a complete general solution to a class of generalized Sylvester matrix equations, the design method of P2D observers in second-order dynamic systems is proposed. The method provides the complete parameterizations...
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