基于扩张状态观测器的导弹滑模制导律

Missile sliding mode guidance law based on extended state observer

针对导弹拦截机动目标的问题,基于扩张状态观测器(ESO,Extended State Observer)设计了一种全新的导弹滑模制导律.考虑拦截时的弹目相对运动关系,通过ESO对目标加速度进行实时的观测和动态补偿,有效地解决了导弹拦截末端所需过载过大的问题,使导弹能够以更小的脱靶量拦截目标.同时在仿真中考虑自动驾驶仪的二阶动态特性,分别以不同的初始航迹角对周期性机动目标和非周期性机动目标进行拦截打击仿真,并与基于有限时间收敛理论提出的滑模制导律对迎击拦截、追击拦截和前向拦截3种方式进行仿真对比,仿真结果表明了基于ESO的滑模制导律在拦截末制导过程中的鲁棒性和优越性.

Based on the technology of extended state observer（ ESO）,a novel missile sliding mode guidance law was derived to intercept maneuvering target. According to relative movement between missile and target in the process of interception,the difficult question was effectively settled that too large overload was required during terminal intercepting phase,which was addressed by currently estimating and dynamically compensating to target acceleration via ESO. Thus,the goal of precision against target was achieved. Moreover,accounting for the autopilot as second-order dynamics in simulation,three simulation experiments of different interception strategies,which included head-on interception,tail-chase interception and head-pursuit interception,were investigated in the two kinds of cases of intercepting periodic maneuvering target and aperiodic maneuvering target. Compared with sliding mode guidance law based on finite time convergence,the results show the strong robustness and validities of the proposed sliding mode guidance law based on ESO in the terminal interception guidance.