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Optimal and robust noncausal filter formulations

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1 Author(s)
Einicke, G.A. ; Div. of Exploration & Min., Commonwealth Sci. & Ind. Res. Organ., Kenmore, Australia

The paper describes an optimal minimum-variance noncausal filter or fixed-interval smoother. The optimal solution involves a cascade of a Kalman predictor and an adjoint Kalman predictor. A robust smoother involving H predictors is also described. Filter asymptotes are developed for output estimation and input estimation problems which yield bounds on the spectrum of the estimation error. These bounds lead to a priori estimates for the scalar γ in the H filter and smoother design. The results of simulation studies are presented, which demonstrate that optimal, robust, and extended Kalman smoothers can provide performance benefits.

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Signal Processing, IEEE Transactions on  (Volume:54 ,  Issue: 3 )