%0 Journal Article %T Closed and Open Loop Subspace System Identification of the Kalman Filter %A David Di Ruscio %J Modeling, Identification and Control %D 2009 %I Norwegian Society of Automatic Control %R 10.4173/mic.2009.2.3 %X Some methods for consistent closed loop subspace system identification presented in the literature are analyzed and compared to a recently published subspace algorithm for both open as well as for closed loop data, the DSR_e algorithm. Some new variants of this algorithm are presented and discussed. Simulation experiments are included in order to illustrate if the algorithms are variance efficient or not. %K Subspace %K Identification %K Closed loop %K Linear Systems %U http://www.mic-journal.no/PDF/2009/MIC-2009-2-3.pdf