Stochastic Modelling and Filtering

Volume 91 of the series Lecture Notes in Control and Information Sciences pp 131-146


Asymptotic study of estimation problems with small observation noise

  • Jean PicardAffiliated withINRIA Avenue Emile Hughes Sophia Antipolis

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In this paper, we study the nonlinear filtering of multidimensional diffusions which are measured in a low noise channel. We describe approximate filters which are solutions of stochastic differential equations driven by the observation process; upper bounds for the corresponding approximation errors are given. The proof is detailed in a particular case where the result can be improved; in particular, the efficiency of the extended Kalman filter is studied.