一种基于末制导的再入轨迹迭代规划方法

A reentry trajectory iteration planning method based on terminal guidance

针对多终端高精度约束的高超声速滑翔飞行器再入轨迹规划问题,提出了一种基于末制导的轨迹迭代生成方法。将再入过程划分为初始下降段、滑翔段和末制导段:初始下降段采用常值倾侧角生成;滑翔段纵向利用两段多项式进行轨迹规划;侧向基于航向角走廊设计倾侧角反转逻辑;末制导段同时在纵向和侧向采用带终端角度约束的最优制导律生成再入轨迹。最后通过迭代航程生成满足终端全状态高精度要求的再入轨迹。仿真结果表明,该方法可生成满足过程约束和终端高精度要求的再入轨迹。

A trajectory iteration generation method based on terminal guidance has been studied for the trajectory planning problem of hypersonic gliding vehicle with high precision requirements for multi-terminal constraints.The reentry process is divided into the initial descent stage,the gliding stage and the terminal guidance stage.The initial descent stage is generated by a constant bank angle.For the gliding stage,two piecewise polynomials are used to plan the longitudinal trajectory and the bank angle reversal logic based on heading angle corridor is designed for lateral motion.For the terminal guidance stage,an optimal guidance law is adopted to generate the reentry trajectory.Finally,a reentry trajectory meeting the high precision requirements for terminal full states is generated by iterating over range.Simulation results demonstrate that this method can generate a reentry trajectory satisfying process constraints and terminal high precision requirements.