一种基于标准轨道法的再入制导方法

A Reentry Guidance Method Based on Standard Trajectory Guidance

针对再入机动飞行器再入段弹道规划问题,通过在阻力加速度-能量剖面终端加入速度倾角控制,使得在满足过程约束的同时包含速度倾角在内的其它终端状态参数满足约束条件,通过实时弹道更新在提高命中精度的同时增强算法的适应性。在攻角给定的情况下,控制指令为倾侧角,其大小分别通过跟踪阻力加速度曲线和控制速度倾角变化率得到,符号由迭代计算的倾侧反转时刻确定。仿真结果表明,给出的规划方法在以较高的精度到达再入段终点的同时具有较好轨迹特性,能满足制导设计的实时性要求。

A trajectory planning method is proposed by augmenting a flight-path angle control phase at the end of drag acceleration profile for reentry maneuvering vehicle. Both path and terminal states constraints including flight-path angle constraint are satisfied. Trajectory update in flight enables high precision of attacking and enhances the adaptability of algorithm. Bank angle is the only control command with angle of attack predetermined,and the value of bank angle is computed separately from drag acceleration profile and flight-path angle rate,and the sign of bank angle depends on iteratively computing bank reversal time. The simulation results demonstrate that the proposed method reaches the end point with smooth trajectory and high precision and the whole planning process is short enough to meet the demand of on-board guidance.