Geodesic
Geometric structures of stable output feedback systems
Kybernetika, Tome 45 (2009) no. 3, pp. 387-404.

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In this paper, we investigate the geometric structures of the stable time-varying and the stable static output feedback systems. Firstly, we give a parametrization of stabilizing time-varying output feedback gains subject to certain constraints, that is, the subset of stabilizing time-varying output feedback gains is diffeomorphic to the Cartesian product of the set of time-varying positive definite matrices and the set of time-varying skew symmetric matrices satisfying certain algebraic conditions. Further, we show how the Cartesian product satisfying certain algebraic conditions is imbedded into the Cartesian product of the set of time-varying positive definite matrices and the set of time-varying skew symmetric matrices. Then, we give some eigenvalue properties of the stable time-varying output feedback systems. Notice that the stable static output feedback system, which does not depend on the temporal parameter $t$, is just a special case of the stable time-varying output feedback system. Moreover, we use the Riemannian metric, the connections and the curvatures to describe the subset of stabilizing static output feedback gains. At last, we use a static output feedback system to illustrate our conclusions.
Classification : 53B20, 58E25, 93B27, 93D15
Keywords: diffeomorphism; geometric structure; output feedback; immersion 
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     author = {Zhang, Zhenning and Sun, Huafei and Zhong, Fengwei},
     title = {Geometric structures of stable output feedback systems},
     journal = {Kybernetika},
     pages = {387--404},
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     volume = {45},
     number = {3},
     year = {2009},
     mrnumber = {2543129},
     zbl = {1169.53316},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2009__45_3_a1/}
}
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Zhang, Zhenning; Sun, Huafei; Zhong, Fengwei. Geometric structures of stable output feedback systems. Kybernetika, Tome 45 (2009) no. 3, pp. 387-404. http://geodesic.mathdoc.fr/item/KYB_2009__45_3_a1/