Journal of Computer Applications ›› 2013, Vol. 33 ›› Issue (03): 878-881.DOI: 10.3724/SP.J.1087.2013.00878

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Discrete sliding-mode guidance laws design based on variable rate reaching law

SHU Yanjun*, TANG Shuo   

  1. School of Astronautics, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
  • Received:2012-09-21 Revised:2012-10-22 Online:2013-03-01 Published:2013-03-01

基于变速趋近律的离散滑模末制导律设计

舒燕军*,唐硕   

  1. 西北工业大学 航天学院,西安 710072
  • 通讯作者: 舒燕军
  • 作者简介:舒燕军(1985-),男,江苏沭阳人,博士研究生,主要研究方向:飞行器制导与控制、建模与仿真; 唐硕(1963-),男,四川达州人,教授,博士生导师,博士,主要研究方向:飞行器动力学与控制、高超音速飞行器动力学建模。
  • 基金资助:

    国家863计划项目(2011AA7022014)。

Abstract: A discrete sliding-mode guidance laws based on a new discrete variable rate reaching law was proposed for the discrete form of the missile-target relative motion equation in plane. By adopting this reaching law, steady state oscillation and system chattering were eliminated significantly, and system state approached to zero diminishingly. Maneuvering acceleration of target was considered as unknown external disturbance, and disturbance observer was adopted to estimate and compensate for the uncertainties, which required just knowing the possible variation range of target acceleration between two adjacent sampling instants rather than a prior knowledge of the target acceleration bounds or matched conditions. The simulation results show this method has strong robustness, without steady state oscillation and system chattering.

Key words: discrete variable rate reaching law, disturbance observer, discrete sliding-mode, guidance law, steady state oscillation, system chattering

摘要: 针对离散化的末制导模型,基于一种新型离散变速趋近律设计了离散滑模制导律。利用该新型离散变速趋近律的特性消除了视线角速率的稳态振荡,使其渐进地趋于原点,并显著降低了系统抖振。将目标机动视为未知不确定性,采用干扰观测器方法对其进行在线估计和补偿,无需知道不确定性的界,只需知道其变化率有界,且无需满足匹配条件。仿真结果表明,所设计的基于新型离散变速趋近律的滑模制导律对目标机动具有鲁棒性,且无稳态振荡和系统抖振。

关键词: 离散变速趋近律, 干扰观测器, 离散滑模, 末制导律, 稳态振荡, 系统抖振

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