详细信息
文献类型:期刊文献
中文题名:基于ARMAX模型的子空间辨识算法
英文题名:A New Subspace Identification Method Based on ARMAX Model
作者:李天一[1];郑建荣[1]
机构:[1]华东理工大学机械与动力工程学院,上海200237
年份:2015
卷号:32
期号:1
起止页码:310
中文期刊名:计算机仿真
外文期刊名:Computer Simulation
收录:CSTPCD;;北大核心:【北大核心2014】;CSCD:【CSCD_E2015_2016】;
语种:中文
中文关键词:子空间辨识;闭环系统;自回归滑动平均模型;扩展最小二乘法
外文关键词:Subspace identification ; Close-loop ; ARMAX model ; Extend least squares
摘要:针对于子空间辨识算法辨识闭环系统时,由于输入信号与不可测噪声是相关的,往往会得到有偏估计的问题。提出一种采用自回归滑动平均模型(ARMAX)的闭环子空间辨识方法,通过扩展最小二乘方法(ELS)估计ARMAX模型中的马尔科夫(Markov)参数,使用预测的子空间辨识方法(PBSID)获取系统参数矩阵,避免了采用高阶自回归模型(ARX)所导致的过大的估计方差等问题。算法实例验证结果表明,改进方法能够获得较好的闭环系统一致性估计,辨识精度较高,有非常良好的应用前景。
Most of the existing subspace identification methods get biased estimation for closed-loop conditions, because of the input signal and the unmeasured noise are related. This paper presents a closed-loop subspace identi- fication method based on Auto Regressive Moving Average model; estimates Markov parameters in the ARMAX model by the extended least square method; recovers system parameter matrix by using the predictor-based subspace identification method. It avoids the too large estimation variance caused by high order Auto Regressive model. A closed-loop simulation example is given to demonstrate that the identification algorithm can obtain consistent estimates and is effective.
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