考虑机动系数的标准轨迹再入制导方法

针对再入过程中标准轨迹的实际长度需要通过多次更新或迭代求解的问题，提出了一种基于机动系数的通用再入轨迹设计方法。该方法将机动系数定义为真实轨迹长度与初始纵程之比，将再入过程中的机动性进行了量化，可以快速获得到达指定目标可行的轨迹长度；采用真实轨迹长度作为设计参考阻力加速度剖面的依据，避免了轨迹长度的迭代，简化了再入轨迹的生成流程；轨迹曲率问题采用动态航向偏差走廊的方法，控制终端航向偏差、剩余航程满足设计需求。设计轨迹跟踪控制器进行参考轨迹跟踪，完成再入制导。在机动系数区间内指定机动系数进行了数值仿真。仿真结果表明，所提出的标准轨迹制导方法能够快速生成满足路径及终端约束的标准轨迹，且轨迹跟踪效果良好，有较好的应用潜力。

Reentry Guidance Method Considering Maneuver Coefficient

A general trajectory design method is proposed for reentry problem considering maneuver coefficient. The maneuver coefficient is defined to describe the relationship between the longitudinal range and the real flight range so that the drag acceleration profile is more accurate. The trajectory design is divided into length and curvature sub-problems: the former is determined by the specified maneuver coefficient, and the latter is controlled by an adjustable heading error corridor to achieve the required terminal condition. A trajectory tracking controller is designed for reference trajectory tracking and reentry guidance. The trajectory is finally generated based on the determined maneuver coefficient and drag acceleration profile. The simulation results demonstrate that the proposed method can quickly generate standard trajectory guidance and has good potential in reentry problem.