组合动力运载器返回段轨迹设计建模研究

为克服当前已有升力式航天器再入模型的不足，建立适应于下面级组合动力运载器的返回段轨迹设计模型，对下面级组合动力运载器返回段轨迹特点和设计难点进行了分析，并针对此类飞行器返回过程中初始状态散布大、返回过程需进行机动转弯和冲压模态动力巡航、各阶段轨迹设计要求各异的问题，在转弯段以运载器速度为积分变量，通过引入方位-视线角偏差标志转弯终点，能够有效处理组合动力运载器返回过程各类约束。该模型计算结果符合组合动力运载器返回段轨迹特点和任务需要，能够满足此类运载器返回段轨迹设计要求。

Research on Modeling of Flyback Trajectory Design for Combined-Propulsion-Powered RLVs

In order to overcome the disadvantages of current methods,and to build a new model of flyback trajectory design for Combined-Propulsion-Powered RLVs,the characteristics and design problems of flyback trajectory of the lower-stage Combined-Propulsion-Powered RLVs are analyzed.In flyback phase,the initial condition of this sort of RLVs is scattered over a wide area,and the large transverse range turning and cruising powered by ramjet mode is required.The trajectory design requirements of different phases are different.To solve the problems above,the disadvantages of current methods are overcome by imposing the angular deviation of azimuth to sight with the velocity used as the integration variable in turning phase,and all the constraints can be imposed and satisfied.The result shows that the model accords with the characteristics of flyback trajectory and satisfies the mission requirements,and the new model can be used in flyback trajectory design for this sort of RLVs.