带有攻击角和视场角约束的制导炮弹导引律设计

针对制导炮弹攻击地面目标的末端导引问题, 提出一种带有攻击角和视场角约束的有限时间滑模导引律。首先, 在传统终端滑模面的基础上加入视场角约束, 并构造正切型障碍李雅普诺夫函数来解决滑模面到达段的约束问题, 以保证制导系统在状态受限的情况下有限时间收敛。其次, 利用扩张状态观测器来估计并补偿目标机动带来的扰动, 有效削弱了导引指令的抖振现象。然后, 基于稳定性理论对导引律进行分析与证明。最后, 通过仿真对比验证该导引律的有效性与鲁棒性。仿真结果表明, 该导引律不仅能满足攻击角和视场角约束, 还具有指令连续、制导时间短、命中精度高等优点。

Guidance law design of guided projectile with impact angle and field-of-view constraints

Aiming at the terminal guidance problem of guided projectile attacking ground target,a finite time sliding mode guidance law with constraints of impact angle and field-of-view angle is proposed.Firstly,the field-of-view angle constraint is added to the traditional terminal sliding surface,and the tangent barrier Lyapunov function is constructed to solve the constraint problem of the reaching phase of the sliding mode surface to ensure the finite time convergence for the guidance system under the condition of limited state.Secondly,the extended state observer(ESO)is used to estimate and compensate the disturbance caused by target maneuver,which effectively weakens the chattering phenomenon of guidance command.Then,the guidance law is analyzed and proved based on the stability theory.Finally,the effectiveness and robustness of the guidance law are verified by comparative simulation.The simulation results show that the guidance law can not only meet the constraints of impact angle and field-of-view angle,but also has the advantages of continuous command,short guidance time and high hit accuracy.