Robust H∞ filtering for nonlinear stochastic systems

  • Authors:
  • Weihai Zhang;Bor-Sen Chen;Chung-Shi Tseng

  • Affiliations:
  • Shenzhen Graduate Sch., China;-;-

  • Venue:
  • IEEE Transactions on Signal Processing
  • Year:
  • 2005

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Abstract

This paper describes the robust H∞ filtering analysis and synthesis of nonlinear stochastic systems with state and exogenous disturbance-dependent noise. We assume that the state and measurement are corrupted by stochastic uncertain exogenous disturbance and that the system dynamic is modeled by Itoˆ-type stochastic differential equations. For general nonlinear stochastic systems, the H∞ filter can be obtained by solving second-order nonlinear Hamilton-Jacobi inequalities. When the worst-case disturbance is considered in the design procedure, a mixed H2/H∞ filtering problem is also solved by minimizing the total estimation error energy. It is found that for a class of special nonlinear stochastic systems, the H∞ filtering design can be given via solving several linear matrix inequalities instead of Hamilton-Jacobi inequalities. A few examples show that the proposed methods are effective.