High-fidelity trajectory optimization for aeroassisted vehicles using variable order pseudospectral method

• 作者: Runqi CHAI Antonios TSOURDOS Al SAVVARIS Senchun CHAI Yuanqing XIA
• 来源期刊: 中国航空学报（英文版）
• 年，卷（期）: 2021,（1）
• 页码范围: 237-251
• 页数: 15页
• 语种: 英文

摘要

In this study, the problem of time-optimal reconnaissance trajectory design for the aeroassisted vehicle is considered. Different from most works reported previously, we explore the feasibility of applying a high-order aeroassisted vehicle dynamic model to plan the optimal flight trajectory such that the gap between the simulated model and the real system can be narrowed. A highly-constrained optimal control model containing six-degree-of-freedom vehicle dynamics is established. To solve the formulated high-order trajectory planning model, a pipelined optimization strategy is illustrated. This approach is based on the variable order Radau pseudospectral method, indicating that the mesh grid used for discretizing the continuous system experiences several adap-tion iterations. Utilization of such a strategy can potentially smooth the flight trajectory and improve the algorithm convergence ability. Numerical simulations are reported to demonstrate some key features of the optimized flight trajectory. A number of comparative studies are also pro-vided to verify the effectiveness of the applied method as well as the high-order trajectory planning model.