The tracking index: A generalized para meter for a-f3 and a·{:l·[" target trackers. General expressions are derived for the density and distribution functions of the amplitude of a linear matched mter output given a nonfluctuatlng target in arbitrary clutter. These generalized Rieian density and distribution functions are based on the density function of the clutter amplitude at the receiver output, and are easily evaluated numerically. Fur thermore, we present error bounds for the numerical calculation of the density function.We also present several numerical example s.

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