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本文利用特征子空间的直接选代（ＤＩ）法，给出了线性控制系统时标分离的子空间方法，并与时标分离的各种Ｒｉｃｃａｔｉ－Ｌｉｋｅ迭代方法做了比较和分析．
In this paper, subspace method for time-scale separation of linear control systems is given by using direct substitution (DI) method of feature subspace, and compared with various Riccati-Like iterative methods of time-scale separation.