Robust H∞ Filtering of 2D Roesser Discrete Systems: A Polynomial Approach

The problem of robust H∞ filtering is investigated for the class of uncertain two-dimensional 2D discrete systems described by a Roesser state-space model. The main contribution is a systematic procedure for generating conditions for the existence of a 2D discrete filter such that, for all admissible uncertainties, the error system is asymptotically stable, and the H∞ norm of the transfer function from the noise signal to the estimation error is below a prespecified level. These conditions are expressed as parameter-dependent linear matrix inequalities. Using homogeneous polynomially parameter-dependent filters of arbitrary degree on the uncertain parameters, the proposedmethod extends previous results in the quadratic framework and the linearly parameterdependent framework, thus reducing its conservatism. Performance of the proposed method, in comparison with that of existing methods, is illustrated by two examples.