In this paper, a trajectory optimization strategy for the hypersonic morphing aircraft is proposed, and the AMPI method is used to generate the online trajectory with initial state errors. Firstly, the aerodynamic model and propulsion model of the hypersonic morphing aircraft were established considering the wingspan and the scramjet. Secondly, the optimization strategy was proposed via Gauss pseudospectral method considering the control variables including angle of attack (AOA) and wingspan. The optimized trajectory met the final constraints and path constraints with the objective to minimize the time of the ascent phase. Then, the AMPI method was used to generate online trajectory without solving OCP or NLP on the base of trajectory database calculated by the optimization strategy. The simulation results indicate high accuracy of AMPI method and the final errors corresponding to different initial errors were acceptable. The mean value of the CPU time of the method was about 0.1 second, which shows real-time capability.

中文翻译：

---

高超音速变形飞机的机载轨迹生成

提出了一种高超声速变型飞机的航迹优化策略，并采用AMPI方法生成了初始状态误差的在线航迹。首先，考虑了翼展和超燃冲压发动机，建立了高超音速变型飞机的气动模型和推进模型。其次，考虑控制变量包括迎角（AOA）和翼展，通过高斯拟谱方法提出了优化策略。优化的轨迹满足了最终约束和路径约束，目的是使上升阶段的时间最小化。然后，基于优化策略计算出的轨迹数据库，使用AMPI方法生成在线轨迹，而无需求解OCP或NLP。仿真结果表明，AMPI方法具有较高的精度，并且可接受与不同初始误差相对应的最终误差。该方法的CPU时间平均值约为0.1秒，这显示了实时能力。