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arXiv 1612.04777eess.SYcs.SYmath.OC
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基于SVD的卡尔曼滤波导数计算

SVD-based Kalman Filter Derivative Computation

Ulyanovsk State University(乌里扬诺夫斯克国立大学);Universidade de Lisboa(里斯本大学)

Julia V. Tsyganova, Maria V. Kulikova

AI总结:

本文提出基于SVD的卡尔曼滤波导数计算方法,通过误差协方差矩阵的SVD分解提升估计精度,尤其在病态情况下表现更优。

摘要:

递归自适应滤波方法常用于解决多领域中同时估计状态和参数的问题。基于梯度的自适应卡尔曼滤波(KF)需要相应的滤波灵敏度计算。传统方法基于直接对KF方程的微分。该策略的缺点是传统KF(及其导数)对舍入误差的数值不稳定性。多年来,KF社区致力于设计高效的滤波实现以提高估计器的鲁棒性。最流行的技巧是平方根(SR)或UD分解方法。这些方法涉及误差协方差矩阵的Cholesky分解。另一种重要的矩阵分解方法是奇异值分解(SVD),因此进一步鼓励的KF算法可能在此方法下找到。同时,滤波灵敏度计算严重依赖于矩阵微分学。以往关于鲁棒KF导数计算的工作产生了SR和UD方法。或者,本文设计了基于SVD的方法。解决方案以基于SVD的KF协方差量及其对未知系统参数的导数表示。数值实验的结果表明,尽管新开发的SVD方法在代数上等同于传统方法和之前推导的SR和UD方法,但在病态情况下,它在估计精度上优于上述技术。

英文摘要:

Recursive adaptive filtering methods are often used for solving the problem of simultaneous state and parameters estimation arising in many areas of research. The gradient-based schemes for adaptive Kalman filtering (KF) require the corresponding filter sensitivity computations. The standard approach is based on the direct differentiation of the KF equations. The shortcoming of this strategy is a numerical instability of the conventional KF (and its derivatives) with respect to roundoff errors. For decades, special attention has been paid in the KF community for designing efficient filter implementations that improve robustness of the estimator against roundoff. The most popular and beneficial techniques are found in the class of square-root (SR) or UD factorization-based methods. They imply the Cholesky decomposition of the corresponding error covariance matrix. Another important matrix factorization method is the singular value decomposition (SVD) and, hence, further encouraging KF algorithms might be found under this approach. Meanwhile, the filter sensitivity computation heavily relies on the use of matrix differential calculus. Previous works on the robust KF derivative computation have produced the SR- and UD-based methodologies. Alternatively, in this paper we design the SVD-based approach. The solution is expressed in terms of the SVD-based KF covariance quantities and their derivatives (with respect to unknown system parameters). The results of numerical experiments illustrate that although the newly-developed SDV-based method is algebraically equivalent to the conventional approach and the previously derived SR- and UD-based strategies, it outperforms the mentioned techniques for estimation accuracy in ill-conditioned situations.

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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