Enhancement of the least-squares Padé method for discrete systems
The least-squares Padé method for discrete system order reduction is further enhanced. First, it is shown how the method may be extended to produce true least-squares approximations between the time responses of the full and reduced models. Second, it is shown how different stable reduced degree denominator polynomials can be generated from subsets of the system Markov parameters. Examples are given to illustrate these enhancements to the method.
Lucas, T.N. 2000. Enhancement of the least-squares Padé method for discrete systems. Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering. 214(2): pp.139-148. Available from http://dx.doi.org/10.1243/0959651001540861