Classification of all finite-dimensional nonlinear filters from Lie algebraic point of view: State dimension 2

In this paper, we give a complete classification of all finite dimensional estimation algebras with state space dimension 2. It is shown that a finite-dimensional estimation algebra with state dimension 2 can only have dimension less than or equal to 6. We then use the Wei-Norman approach to construct all finite-dimensional nonlinear filters with state space dimension 2 from the Lie algebraic point of view.

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