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arXiv 2301.02541stat.AP
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作为改进粒子滤波预测步策略的单步固定滞后粒子平滑器

The one step fixed-lag particle smoother as a strategy to improve the prediction step of particle filtering

Samuel Nyobe, Fabien Campillo, Serge Moto, Vivien Rossi

AI总结:

针对经典bootstrap粒子滤波中预测步易致粒子匮乏引发滤波器退化的问题,提出单步固定滞后平滑器的简单近似方法,通过预测步额外仿真提升所选粒子似然性。

摘要:

序贯蒙特卡洛方法是针对存在部分含噪观测的随机动态状态空间系统的数值信号处理领域的一项重大突破。然而,这些方法仍存在一定缺陷,其中最根本的问题之一是粒子匮乏导致的滤波器退化:预测步使粒子探索状态空间,若这种探索执行不当,或是与后续用于评估每个粒子似然的观测相冲突,就会导致粒子匮乏。本文在经典bootstrap粒子滤波(自助粒子滤波)的框架内,为改进这最后一步,提出了单步固定滞后平滑器的一种简单近似方法。在每次时间迭代中,我们提出在预测步期间执行额外仿真,以提升所选粒子的似然性。

英文摘要:

Sequential Monte Carlo methods have been a major breakthrough in the field of numerical signal processing for stochastic dynamical state-space systems with partial and noisy observations. However, these methods still present certain weaknesses. One of the most fundamental is the degeneracy of the filter due to the impoverishment of the particles: the prediction step allows the particles to explore the state-space and can lead to the impoverishment of the particles if this exploration is poorly conducted or when it conflicts with the following observation that will be used in the evaluation of the likelihood of each particle. In this article, in order to improve this last step within the framework of the classic bootstrap particle filter, we propose a simple approximation of the one step fixed-lag smoother. At each time iteration, we propose to perform additional simulations during the prediction step in order to improve the likelihood of the selected particles.

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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