Observer design for systems with unknown inputs

By S. Hui, Stanislaw H. Zak. 2005

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Adaptive sensor and actuator fault estimation for a class of uncertain Lipschitz nonlinear systems (2016, background): “For the case of linear systems, the unknown input estimation has been well understood and several results are available [2, 7–10].”
Ltd Registered in England and Wales Registered Number : 1072954 Registered office : (2004, methodology): “In the sliding mode community there are works where observers have been designed assuming that the Hautus condition is satisfied (Walcott and Zak 1987; Edwards, Spurgeon, and Tan 2002; Hui and Zak 2005).”
On the simultaneous state and unknown input estimation of complex systems via a multiple model strategy (2009, background): “In a general way, the UIO design consists in finding a projection operator or a matrix transformation fulfilling a set of algebraic equations in order to decouple the UI and the estimation error (see [1, 2, 3, 4, 5] and references therein).”