For the terminal angle constraint guidance problem,a fixed-time angle constraint guidance law based on partial states feedback was developed.Firstly,based on the uniform robust exact differentiator algorithm,a fixed time state observer was developed to estimate the unmeasured system state.Then,based on fixed-time stability,an integral sliding-mode surface was developed,and a fixed-time guidance law was developed to guarantee the fixed-time convergences of sliding-mode surface and guidance error.Compared with the conventional finite-time guidance law,the proposed guidance law not only can guarantee that the upper bound of convergence time is bounded by the constant which is not relate to the initial system states but also only need partial states to feedback to simplify the guidance system.Finally,the simulation results illustrate that the proposed guid-ance law can achieve the fixed-time stability by using the partial states to feedback.
关键词
滑模制导律/固定时间收敛/部分状态反馈/积分滑模面
Key words
sliding mode guidance law/fixed-time convergence/partial states feedback/integral sliding-mode surface
维普
万方数据