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The Extended State Observer(ESO),which is featured with timely estimating the “total disturbance"of system,has been proven to be powerful dealing with nonlinear uncertain systems.With the idea of ESO,we proposed the augmented Luenberger Observer which ensures the resulting control feedback design has better disturbance rejection.Also,we constructed the Extended State Filter and proven its stability for a general class of systems with nonlinear unknown dynamics,stochastic process and measurement noises.