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arXiv 2112.02802eess.SYcs.SY
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切换线性系统的辨识:激励持续性和数值算法

Identification of Switched Linear Systems: Persistence of Excitation and Numerical Algorithms

Biqiang Mu, Tianshi Chen, Changming Cheng, Er-Wei Bai

摘要:

本文研究切换线性系统辨识的两个问题:激励持续性和数值算法。主要的贡献是一个弱得多的条件,回归持续兴奋,保证参数集的唯一性,也提供了新的见解,在理解不同的子系统之间的关系。研究发现,对于唯一确定切换线性系统的参数,由我们的条件推导出的所需的最小样本数远小于文献中报道的。本文的第二个贡献涉及数值算法。虽然该算法不是新的,我们表明,我们的代理问题,放宽从整数优化到连续最小化,具有完全相同的解决方案,作为原来的整数优化,这是有效地解决了块坐标下降算法。此外,提出了一种处理未知数量子系统的算法。最后给出了几个数值例子来支持理论分析。

英文摘要:

This paper investigates two issues on identification of switched linear systems: persistence of excitation and numerical algorithms. The main contribution is a much weaker condition on the regressor to be persistently exciting that guarantees the uniqueness of the parameter sets and also provides new insights in understanding the relation among different subsystems. It is found that for uniquely determining the parameters of switched linear systems, the minimum number of samples needed derived from our condition is much smaller than that reported in the literature. The secondary contribution of the paper concerns the numerical algorithm. Though the algorithm is not new, we show that our surrogate problem, relaxed from an integer optimization to a continuous minimization, has exactly the same solution as the original integer optimization, which is effectively solved by a block-coordinate descent algorithm. Moreover, an algorithm for handling unknown number of subsystems is proposed. Several numerical examples are illustrated to support theoretical analysis.

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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