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Robust matched filtering is considered for multiple-input systems, with problems formulated in both frequency and time domains being given specific treatment. Robust solutions are found for bounded classes containing well-defined but not exactly specified input characteristics. Several properties for some special cases of interest are examined, and an example is given to illustrate the usefulness of the results. Finally, the results are applied to a narrowband spatial array system, for which the robust scheme has an interesting and useful characteristic.