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针对机动目标拦截末制导问题,提出一种考虑终端角度约束的自适应积分滑模制导律.首先给出一种有限时间收敛的非线性积分滑模面,采用快速终端滑模设计趋近律;然后设计一种对目标机动加速度上界平方进行估计的自适应律,给出具有光滑特性的自适应积分滑模制导律;最后基于有限时间理论证明闭环系统的有限时间收敛特性,并给出滑模变量、视线角以及视线角速率的收敛域.数值仿真结果验证了所提出设计方案的有效性.
Aiming at the terminal guidance problem of maneuvering target interception, an adaptive integral sliding mode guidance law considering terminal angle constraints is proposed. First, a nonlinear integral sliding mode surface with finite time convergence is given, and the fast terminal sliding mode is used to design the approach law. Then, an adaptive law to estimate the square of upper maneuvering acceleration is designed, and an adaptive integral sliding mode guidance law with smoothness is given. Finally, based on the finite-time theory, the finite-time convergence of the closed-loop system is proved. Modal variables, line-of-sight and convergence rate of line-of-sight angular velocity.The numerical simulation results verify the effectiveness of the proposed design.