A Chattering Free Discrete-Time Global Sliding Mode Controller for Optoelectronic Tracking System

被引：8

作者：

Ren, Yan ^{[1
,2
]}

Liu, Zhenghua ^{[1
]}

Liu, Xiaodong ^{[3
,4
]}

Zhang, Yu ^{[5
]}

机构：

[1] Beihang Univ, Sch Automat Sci & Elect Engn, Beijing 100191, Peoples R China

[2] Inner Mongolia Univ Sci & Technol, Informat Engn Sch, Baotou 014010, Peoples R China

[3] Beijing Aerosp Automat Control Inst, Beijing 100854, Peoples R China

[4] Nat Key Lab Sci & Technol Aerosp Intelligence Con, Beijing 100854, Peoples R China

[5] Beijing Inst Space Launch Technol, Beijing 100076, Peoples R China

来源：

MATHEMATICAL PROBLEMS IN ENGINEERING | 2013年 / 2013卷

关键词：

VARIABLE-STRUCTURE CONTROL; ADAPTIVE-CONTROL;

D O I：

10.1155/2013/951492

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Aiming at the uncertainties including parameter variations and external disturbances in optoelectronic tracking system, a discrete-time global sliding mode controller (DGSMC) is proposed. By the design of nonlinear switching function, the initial state of control system is set on the switching surface. An adaptive discrete-time reaching law is introduced to suppress the high-frequency chattering at control input, and a linear extrapolation method is employed to estimate the unknown uncertainties and commands. The global reachability for sliding mode and the chattering-free property are proven by means of mathematical derivation. Numerical simulation presents that the proposed DGSMC scheme not only ensures strong robustness against system uncertainties and small tracking error, but also suppresses the high-frequency chattering at control input effectively, compared with the SMC scheme using conventional discrete-time reaching law.

引用

页数：8

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