自适应非奇异快速终端二阶滑模制导律

Adaptive Nonsingular Fast Terminal Second-order Sliding Mode Guidance Law

针对打击机动目标带攻击角度约束的末制导问题,提出了一种带攻击角度约束的制导律。基于弹目相对运动模型,将攻击角度约束问题转化为终端视线角约束问题。设计了一种新型非奇异快速终端滑模面,结合改进的超螺旋算法,提出了一种自适应非奇异快速终端二阶滑模制导律。该制导律能够使弹目视线角及其角速率有限时间收敛,并设计了参数自适应律有效补偿未知扰动。通过仿真实验,验证了所提制导律能以期望攻击角度精确命中目标,且与现有制导律相比,收敛速度更快,制导精度更高,能量消耗更少。

Aiming at the terminal guidance with impact angle constraint against maneuvering targets,a guidance law with impact angle constraint was proposed.Based on the relative motion model of the missile and target,the impact angle constraint was transformed into the terminal line of sight(LOS)angle constraint.A new nonsingular fast terminal sliding-mode-surface was designed.Combined with the improved super-twisting algorithm,an adaptive nonsingular fast terminal second-order sliding-mode guidance law was proposed.The guidance law can make the LOS angle and LOS angular rate converge in finite-time,and a parameter adaptive-law was designed to effectively compensate the unknown disturbance.The simulation results indicate that by the proposed guidance law,the target can be accurately intercepted with expected impact angle.Compared with the existing guidance laws,the proposed guidance law has faster convergence speed,higher guidance precision and less energy consumption.