Abstract
The asymptotic stability of the estimation error of the State Dependent Differential Riccati Equation (SDDRE) based observer of nonlinear deterministic time-varying systems is proved. Boundedness of all matrices and measured quantities, and uniform observability and controllability along the observer's trajectories are sufficient for the estimation error convergence to zero. The stability-convergence is demonstrated by simulation of Van der Pol equation with nonlinear measurement.
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