%0 Journal Article
%T Adaptive observer design for a class of nonlinear systems<br>一类非线性系统的自适应观测器设计
%A ZHAO Li-li
%A LI Ping
%A LI Xiu-liang
%A <br>赵黎丽
%A 李平
%A 李修亮
%J 控制理论与应用
%D 2012
%I 
%X In analyzing faulty systems, actuator faults and sensor faults can be modeled respectively by unknown parameters in the state equation and the output equation. Thus, it is of practical significance to develop an adaptive observer for the state equation and the output equation containing unknown parameters simultaneously. Based on the techniques of high-gain observer and adaptive estimation, we constructively design an adaptive observer for jointly estimating the states and the unknown parameters of a class of uniformly observable nonlinear systems. This adaptive observer employs a timevarying gain matrix for estimating unknown parameters, which is simple in construction and requires simple parameter tuning. We have also derived the required persistent excitation condition for the adaptive observer to be global exponential convergence, and give the corresponding proof succinctly. A numerical example is presented to illustrate the performance of this adaptive observer.
%K adaptive observer
%K high-gain observer
%K joint estimation of states and parameters
%K nonlinear system<br>自适应观测器
%K 高增益观测器
%K 状态和参数联合估计
%K 非线性系统
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=970898A57DFC021F93AB51667BAED7F7&aid=DBA62DC485243249257B0BE59DFF363C&yid=99E9153A83D4CB11&vid=771469D9D58C34FF&iid=CA4FD0336C81A37A&sid=708DD6B15D2464E8&eid=13553B2D12F347E8&journal_id=1000-8152&journal_name=控制理论与应用&referenced_num=0&reference_num=0