31 May 1996 Nonlinear optimal semirecursive filtering
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This paper describes a new hybrid approach to filtering, in which part of the filter is recursive but another part in non-recursive. The practical utility of this notion is to reduce computational complexity. In particular, if the non- recursive part of the filter is sufficiently small, then such a filter might be cost-effective to run in real-time with computer technology available now or in the future.
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Frederick E. Daum, "Nonlinear optimal semirecursive filtering", Proc. SPIE 2759, Signal and Data Processing of Small Targets 1996, (31 May 1996); doi: 10.1117/12.241177; https://doi.org/10.1117/12.241177

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