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讨论区域极点约束下，含结构参数扰动的不确定线性离散系统的鲁棒控制问题，即设计一鲁棒状态反馈控制器，使线性离散系统在可允许的参数扰动下，闭环矩阵极点始终位于一预先给定的圆形区域中，从而闭环系统具有期望的动态性能．上述控制目的可通过求解一含参数的代数离散Ｒｉｃｃａｔｉ方程达到．
The problem of robust control for uncertain discrete-time systems with structural perturbations under the pole constraints of the region is discussed. That is, a robust state feedback controller is designed so that the pole of the closed-loop matrix is always within a In a given circular area, the closed-loop system thus has the desired dynamic behavior. The above control objective can be achieved by solving a algebraic discrete Riccati equation with parameters.