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Stabilization of stochastic nonlinear systems driven by noise of unknown covariance

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3 Author(s)
Hua Deng ; California Univ., San Diego, La Jolla, CA, USA ; Krstic, M. ; Williams, R.J.

This paper poses and solves a new problem of stochastic (nonlinear) disturbance attenuation where the task is to make the system solution bounded by a monotone function of the supremum of the covariance of the noise. This is a natural stochastic counterpart of the problem of input-to-state stabilization in the sense of Sontag (1989). Our development starts with a set of new global stochastic Lyapunov theorems. For an exemplary class of stochastic strict-feedback systems with vanishing nonlinearities, where the equilibrium is preserved in the presence of noise, we develop an adaptive stabilization scheme (based on tuning functions) that requires no a priori knowledge of a bound on the covariance. Next, we introduce a control Lyapunov function formula for stochastic disturbance attenuation. Finally, we address optimality and solve a differential game problem with the control and the noise covariance as opposing players; for strict-feedback systems the resulting Isaacs equation has a closed-form solution

Published in:

Automatic Control, IEEE Transactions on  (Volume:46 ,  Issue: 8 )

Date of Publication:

Aug 2001

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