可重复使用航天器时间协同飞行轨迹优化

针对可重复使用航天器(RLV)时间协同飞行轨迹优化问题,提出了一种基于Radau伪谱法的轨迹优化方法。方法以再入飞行时间可知性、可控性为目标,使用Radau伪谱法对RLV的飞行时间进行预测,进而协调出多RLV的再入协同飞行时间,以此再入飞行时间为终端约束使用Radau伪谱法生成满足协同飞行要求的再入轨迹。仿真结果表明,上述轨迹优化方法可以得到满足时间协同约束、状态约束和控制约束的飞行轨迹,具有较高的稳定性和较快的求解速度。所提方法满足多架RLV时间协同再入飞行的需求,具有很强的实用价值。

Time-Coordination Reentry Trajectory Design for Reusable Launch Vehicle

Aiming at the problem of time cooperative flight trajectory optimization for reusable launch vehicle,a trajectory optimization method based on Radau pseudo-spectra is proposed in this paper.Aiming at the predictability and controllability of reentry flight time,this method used Radau pseudo-spectra to predict the flight time of RLV,and then coordinated the cooperative reentry flight time of multiple RLVs.With this flight time as the terminal con-straint,the Radau pseudo-spectra were used to generate the reentry trajectory that can meet the requirements of coop-erative flight.The simulation results show that the trajectory optimization method can obtain the flight trajectories sat-isfying time coordination constraints,state constraints and control constraint,and has high stability and fast solving speed.This method meets the requirements of multiple RLVs time cooperative reentry flights,and has strong practical value.