Firstly, a sufficient and necessary condition for an uncertain discrete-time descriptor system to be robust quadratically stable is given.
首先，给出不确定离散广义系统鲁棒二次稳定的充要条件。
This controller not only can make the closed-loop system quadratically stable but also can make the norm of the closed-loop system less than a given bound.
该控制器不但能使被控对象的闭环系统二次稳定，而且满足一定的范数界约束。
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