A note on order reduction by the discrete-time least-squares Padé method
It is shown that reduced order models produced by the least-squares Padé method for discrete-time systems can sometimes produce misleading results for step and polynomial inputs. A more representative way of deriving such models is put forward and a numerical example is given to illustrate the points raised in the discussion.
Lucas, T.N. 1999. A note on order reduction by the discrete-time least-squares Padé method. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering. 213(1): pp.61-64. Available from http://dx.doi.org/10.1243/0959651991540386