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基于奇异值分解的非均匀采样系统最小二乘辨识

2014-04-11

集宁师范学院学报 2014年1期

李 楠 张 为

(1.内蒙古科技大学包头师范学院物理科学与技术学院,内蒙古 包头 014030;2.内蒙古科技大学包头师范学院信息学院,内蒙古 包头 014030)

基于奇异值分解的非均匀采样系统最小二乘辨识

李楠1张为2

(1.内蒙古科技大学包头师范学院物理科学与技术学院,内蒙古包头014030;2.内蒙古科技大学包头师范学院信息学院,内蒙古包头014030)

摘要:针对非均匀周期多采样率系统,在状态估计为已知的情况下,提出了基于奇异值分解的模型参数的最小二乘辨识方法.首先,根据系统的连续时间状态空间模型,在满足因果关系基础上,推导了含有提升变量的离散状态空间模型.然后,为了克服辨识误差积累和传递,采用基于奇异值分解的递推最小二乘方法确定模型参数.最后,仿真结果表明提出方法的有效性.

关键词:状态空间模型;奇异值分;多采样率系统;非均匀采样

参考文献:

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中图分类号:TP15

文献标识码:A

文章编号:2095-3771(2014)01-0093-07

收稿日期:2014-01-21

作者简介:李楠(1976—),女,汉族,河北省定县人,内蒙古科技大学包头师范学院物理科学与技术学院讲师,硕士。

基金项目:国家自然科学基金“用显卡通用计算方法设计超导/铁磁异质结构的磁通量子器件”(项目编号:11064008)。

The Identification of Least Squares in Non-Uniform Sampling System via Singular Values Decomposition

LI Nan1ZHANG Wei2
(1.Physics Science and Technology Department of Baotou Teachers’College,Inner Mongolia University of Science and Technology,Baotou 014030 Inner Mongolia;(2.Information Department of Baotou Teachers’College,Inner Mongolia University of Science and Technology,Baotou 014030,Inner Mongolia)

Abstract:The least-squares method is proposed via the model parameter of singular value decomposition(SVD)specific to the non-uniformly sampling system under the assumption that the state estimates are known.Firstly,the discrete state-space model with the lifting variables is derived from the continuous state-space model on the basis of realizing the causality constraints.Secondly,to overcome the accumulation and the transmission of the identification errors,the recursive least-squares method based on singular values decomposition is developed to determine the parameter of the identified model.Finally,the simulation results show the effectiveness of the proposed method.

Key words:state-space model;singular value decomposition;multi-rate sampled systems;nonuniform sampling