Stability of Recursive Stochastic Tracking Algorithms

Authors:
Lei Guo
Affiliations:
-
Venue:
SIAM Journal on Control and Optimization
Year:
1994

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Abstract

First, the paper gives a stability study for the random linear equation $X_{n+1}=(I-A_{n})x_n$. It is shown that for a quite general class of random matrices $\{A_n\}$ of interest, the stability of such a vector equation can be guaranteed by that of a corresponding scalar linear equation, for which various results are given without requiring stationary or mixing conditions. Then, these results are applied to the main topic of the paper, i.e., to the estimation of time varying parameters in linear stochastic systems, giving a unified stability condition for various tracking algorithms including the standard Kalman filter, least mean squares, and least squares with forgetting factor.