On the connection between estimability and observability
D. Goshen-Meskin, Itzhack Y. Bar‐Itzhack · IEEE Transactions on Automatic Control · 1992
It is shown that when a linear dynamic system is stochastically autonomous (that is, when the system is not excited by a random signal), its estimability property as defined by Y. Baram and T. Kailath (ibid., vol.33, p.1116-21, Dec. 1988) reduces to the classical observability property.>