A finite-time 3D guidance law based on fixed-time convergence disturbance observer  

作　　者：Feng YANG Guangqing XIA 

机构地区：[1]State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China [2]Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province,Dalian University of Technology,Dalian 116024,China [3]School of Aeronautics and Astronautics,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Journal of Aeronautics》2020年第4期1299-1310,共12页中国航空学报（英文版）

摘　　要：In order to achieve accurate interception of high-speed maneuvering targets,this paper presents a relative Line-of-Sight(LOS)velocity based finite-time three-dimensional guidance law design framework,and discusses the application of fixed-time convergence disturbance observer in this framework.Firstly,a simple Lyapunov function is provided to show that the coupled terms in the relative kinematics can be ignored in the proposed guidance law design framework.Secondly,the realizations of several classical guidance laws are analyzed with the proposed framework,including TPN guidance law,finite-time Input-to-State Stability(ISS)guidance law,and sliding mode guidance law.Thirdly,fixed-time convergence disturbance observers are introduced to design the composite finite-time 3D guidance law,and Lyapunov method is employed to show the stability of the guidance system.Numerical simulations with different scenarios show that the proposed generalized guidance law performs high interception accuracy.

关 键 词：DISTURBANCE Finite-time stability Fixed-time stability Guidance law OBSERVER 

分 类 号：V249[航空宇航科学与技术—飞行器设计] V448