On Galerkin Approximations for the Zakai Equation with Diffusive and Point Process Observations
On Galerkin Approximations for the Zakai Equation with Diffusive and Point Process Observations
复制标题
具有扩散和点过程观测的Zakai方程的伽辽金近似
DOI:
10.1137/110837395
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Schmid
中科院分区:
文献类型:
--
作者:
Schmid
This paper studies Galerkin approximations applied to the Zakai equation of stochastic filtering. The basic idea of this approach is to project the infinite-dimensional Zakai equation onto some finite-dimensional subspace generated by smooth basis functions; this leads to a finite-dimensional system of stochastic differential equations that can be solved numerically. The contribution of the paper is twofold. On the theoretical side, existing convergence results are extended to filtering models with observations of point-process or mixed type. On the applied side, various issues related to the numerical implementation of the method are considered; in particular, we propose working with a subspace that is constructed from a basis of Hermite polynomials. The paper closes with a numerical case study.
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