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arXiv 2409.09299eess.SYcs.SY
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基于核的正则化连续时间系统辨识:从采样数据出发

Kernel-Based Regularized Continuous-Time System Identification from Sampled Data

Xiaozhu Fang, Biqiang Mu, Tianshi Chen

AI总结:

针对采样数据下连续时间系统辨识问题,本文证明在零阶保持或带限输入下 KRM 估计量具有闭式解,并通过蒙特卡洛实验验证其更鲁棒且小样本更准确。

摘要:

半个世纪以来,从离散时间(DT)输入与输出信号(即采样数据)辨识连续时间(CT)系统受到了广泛关注。现有最先进方法属于参数化方法,因而会受到参数化方法典型问题的影响。在过去十年中,系统辨识领域的一项重要进展是所谓的基于核的正则化方法(KRM),该方法不存在参数化方法的那些问题。检验 KRM 在连续时间系统辨识中的潜力是一个有意义的课题。然而,相关研究结果极少,主要原因在于:除某些非常特殊的情况外,对于一般的连续时间输入信号,其估计量不存在闭式解。本文证明,对于 KRM,当离散时间输入信号具有典型的样本间行为,即零阶保持或带限特性时,估计量具有闭式解;这为 KRM 应用于连续时间系统辨识铺平了道路。蒙特卡洛数值仿真表明,所提方法比现有最先进方法更具鲁棒性,并且在样本量较小时更为准确。

英文摘要:

The identification of continuous-time (CT) systems from discrete-time (DT) input and output signals, i.e., the sampled data, has received considerable attention for half a century. The state-of-the-art methods are parametric methods and thus subject to the typical issues of parametric methods. In the last decade, a major advance in system identification is the so-called kernel-based regularization method (KRM), which is free of the issues of parametric methods. It is interesting to test the potential of KRM on CT system identification. However, very few results have been reported, mainly because the estimators have no closed forms for general CT input signals, except for some very special cases. In this paper, we show for KRM that the estimators have closed forms when the DT input signal has the typical intersample behavior, i.e., zero-order hold or band-limited, and this paves the way for the application of KRM for CT system identification. Numerical Monte Carlo simulations show that the proposed method is more robust than the state-of-the-art methods and more accurate when the sample size is small.

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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