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针对通用航空飞行器(CAV)的再入飞行问题,研究了一种滑翔式再入飞行器的三自由度轨迹快速生成方法。该方法将再入轨迹分为初始下降段、过渡段和占大部分飞行时间的拟平衡滑翔段,引入拟平衡滑翔条件(QEGC),将过程约束转换成倾侧角制导律的上界。结合预测校正方法在线设计满足各种轨迹约束的倾侧角制导律,最后在计算机上进行制导仿真。仿真结果表明,该方法可快速地得到满足过程约束和目标要求的弹道。
Aiming at the problem of reentry flight of general aviation vehicle (CAV), a rapid generation method of three-freedom trajectory of gliding reentry vehicle is studied. In this method, the re-entry trajectory is divided into the initial descent section, the transition section and the quasi-balanced gliding section which accounts for most of the flight time. The quasi-equilibrium gliding condition (QEGC) is introduced to transform the process constraint into the upper bound of the roll angle guidance law. Combined with the predictive correction method, a roll angle guidance law satisfying various trajectory constraints is designed online. Finally, the guidance simulation is performed on the computer. The simulation results show that this method can quickly get the trajectory to meet the process constraints and target requirements.