Savkin, Andrey V.Petersen, Ian R.2026-07-032026-07-030191-2216ORCID:/0000-0003-4856-9450/work/219177655https://hdl.handle.net/1885/733812575This paper considers a problem of fixed order robust H ∞ filtering for a class of linear uncertain systems. The main result of the paper shows that for the fixed order robust H ∞ filtering problems under consideration, there is no advantage to be obtained by using a nonlinear filter as opposed to a linear filter.Acknowledgement-This work Australian Research Council.2en19960030384499