中文摘要：

针对可重复使用运载器轨迹设计问题,在高度-速度空间中分析了再入飞行中的热流、动压和过载三种过程约束与速度的关系,通过求导变换和积分得到了具有统一形式的过程约束的数学规律,基于该规律及相关特性得到了闭环解析解,并应用该解析解提出了一种再入轨迹在线生成方法。该方法考虑纵向和横向耦合运动,能够充分发挥再入飞行能力并保证满足过程约束,通过对大、中、小纵程轨迹设计问题分别进行测试,仿真结果验证了所提出的轨迹生成方法的可行性,对飞行任务具有适应性,并在处理过程约束方面具有优势。

英文摘要：

The relationships between path constraints such as heating rate,dynamic pressure and aerodynamic load and velocity during entry flight are analyzed in r-V plane for an entry vehicle with mediate-high lift-to-drag ratio.Through derivation and integration,a unified formula for path constraints is obtained in r-V plane.Based on the unified formula and several characteristics an analytical solution is obtained,and an online trajectory generation method is developed.In the method,the coupled longitudinal and lateral motion is considered,and can make the best use of flight capability and satisfy path constraints.Trajectory generation cases with different flight mission and downranges are tested.Simulation results demonstrate the capability and efficiency of the trajectory planning method in dealing with path constraints.