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A recently developed nonlinear H∞ observer and Extended Kalman Filter (EKF) offer two filters for state estimation in nonlinear systems. The Riccati equation that arises while developing the nonlinear H∞ observer is compared with the Riccati equation arising from the Extended Kalman Filter (EKF). Variations between the two Riccati equations translate into the differences in the performance of these...
Robust stability conditions are investigated for an adaptive regulation scheme which is capable of tuning a time-varying controller to mitigate the effects of unknown disturbances. Coprime factorization of the plant and the controller are used to tune the controller while allowing parameter uncertainty within the model. While the stability conditions are applicable to general time-varying parameterizations...
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