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

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