Comments on "Parameterization of linear observers and its application to observer design"

The original paper (X. Ding, L. Guo and P.M. Frank, IEEE Trans. Automat. Contr., vol. 39, no. 8, p. 1648-52, 1994) uses a factorization approach to parameterize all stable observers. The authors state that the results are interesting, but draw attention to their own parallel results (Syst. Contr. Lett., vol. 13, p. 161-3, 1989, and Digital and Control and Estimation, Englewood Cliffs, NJ: Prentice-Hall, 1990).<
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