固定时间收敛扰动观测终端滑模制导律设计  

Fixed-time disturbance observer based terminal sliding mode guidance law

作　　者：景亮 张忠阳[2] 崔乃刚[1] 吴荣 JING Liang;ZHANG Zhongyang;CUI Naigang;WU Rong(Department of Astronautics Engineering,Harbin Institute of Technology,Harbin 150001,China;The Second Academy of China Aerospace Science & Industry Corp.,Beijing 100854,China)

机构地区：[1]哈尔滨工业大学航天工程系,黑龙江哈尔滨150001 [2]中国航天科工集团第二研究院,北京100854

出　　处：《系统工程与电子技术》2019年第8期1820-1826,共7页Systems Engineering and Electronics

基　　金：哈尔滨市科技创新人才研究专项资金(2015RQQXJ089)资助课题

摘　　要：针对机动目标拦截问题,设计了基于固定时间收敛扰动观测器(fixed-time disturbance observer,FxTDO)的终端角度约束非奇异快速终端滑模制导律(nonsingular fast terminal sliding mode guidance law,NFTSMGL)。通过具有固体时间收敛特性的扰动观测器对导弹拦截过程的外部扰动进行快速、精确估计。同时为了抑制抖振影响以及保证制导信号在有限的时间范围内收敛,设计了NFTSMGL,并进行了稳定性分析。仿真结果表明,FxTDO-NFTSMGL可以使制导信号在有限的时间范围内收敛至期望状态,并满足对机动目标拦截的要求,相较于无观测器的NFTSMGL收敛速度更快,且避免了抖振现象。An impact angle constrained nonsingular fast terminal sliding mode guidance law(NFTSMGL)based on fixed-time disturbance observer(FxTDO)is designed in the presence of uncertain disturbances.FxTDO is used to accurately estimate the internal and external disturbance in the process of missile interceptor.In order to attenuate the chattering and ensure the convergence of guidance system within finite time,a NFTSMGL method is adopted.The stability analysis is carried out.The simulation results show that FxTDO-NFTSMGL can be used to converge the guidance system at a limited time and meet the requirements of maneuvering target interception.Compared with NFTSMGL,the guidance law has a fast convergence speed and avoids the chattering problem.

关 键 词：机动目标拦截 固定时间收敛扰动观测器 非奇异快速终端滑模制导 攻击角度约束 

分 类 号：V448.133[航空宇航科学与技术—飞行器设计]