arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2307.03428stat.CO
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重新审视状态空间模型平滑的双滤波器公式

Revisiting the Two-Filter Formula for Smoothing for State-Space Models

G. Kitagawa

AI总结:

本文通过实际例子重新审视状态空间模型的双滤波器平滑公式,证明适当定义逆滤波器可使线性高斯和非高斯模型获得良好平滑结果,并指出粒子滤波中固定滞后平滑或前后向平均效果更优。

摘要:

本文通过实际例子考察了状态空间模型的平滑算法,即固定区间平滑、固定滞后平滑和双滤波器平滑公式。对于线性高斯状态空间模型,观察到通过适当定义逆滤波器可以获得相似的后验分布。在线性非高斯状态空间模型的情况下,研究表明,通过适当设置逆滤波器,即使对于具有高斯混合噪声输入的相对高维状态空间模型,高斯和平滑也是可行的。双滤波器公式也适用于粒子滤波器,但使用固定滞后平滑或前向与后向固定滞后平滑器的平均值可以获得更好的结果。

英文摘要:

Smoothing algorithms for state-space models, i.e., fixed-interval smoothing, fixed-lag smoothing, and two-filter formula for smoothing, are examined using real examples. For linear and Gaussian state-space models, it is observed that similar posterior distributions can be obtained by properly defining the inverse filter. In the case of linear non-Gaussian state-space models, it is shown that Gaussian-sum smoothing is possible even for relatively high dimensional state-space model with Gaussian-mixture noise inputs by properly setting the inverse filter. The two-filter formula is also applicable for particle filter, but better results are obtained with fixed lag smoothing or with the average of forward and backward fixed lag smoothers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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