基于NHDO的机动目标拦截攻击角度约束导引律

为了精确控制导弹在有限时间内以期望攻击角度拦截机动目标,采用将导弹自动驾驶仪简化为惯性环节的方法,结合终端滑模控制理论设计了一种带攻击角度约束的有限时间收敛制导律。为了滤除视线角速率噪声,提出一种非线性跟踪微分滤波器对噪声进行滤波,建立了考虑滤波的制导系统状态方程,基于此方程设计非齐次干扰观测器,用于目标机动不确定项的估计补偿。仿真结果表明,所设计的制导律能达到对视线角速率有效滤波,对目标机动状态精确估计的目的,克服系统动态延迟对制导精度的不利影响,满足攻击角度和制导精度的双重要求。

NHDO-based impact angle control guidance law for maneuvering target

In order to control the missile to attack the maneuvering target with desired terminal impact angle precisely in finite time, finite time convergence guidance law based on terminal sliding mode control theory is proposed according to simplified autopilot lag by the first order inertial element.To filter the noise of the LOS rate, a nonlinear tracking differential filter is proposed and the state equation of the guidance system is constructed considering filtering.Meanwhile, a non-homogeneous disturbance observer is devised based on the equation of state proposed to track and estimate the target maneuver disturbance.Simulation results show that the proposed guidance law can achieve the aim of filtering the LOS rate noise, precisely tracking the maneuver state of the targets, eliminating the adverse effect caused by the dynamic delay, satisfying the requirements of terminal impact angle and guidance precision.