Identifiability conditions for linear multivariable systems operating under feedback
T. Söderström, Lennart Ljung, Ivar Gustavsson · IEEE Transactions on Automatic Control · 1976
The possibility of estimating the parameters of a dynamic system when it is operating in closed loop is examined. Earlier considered ways of designing regulators to achieve desired identifiability properties are unified and generalized. The result of the analysis of this short paper gives a simple criterion, which contains earlier known conditions as simple special cases.