【摘要】 针对轨道转移飞行器入轨任务中可能的异常状态,提出一种基于任务分区的在线轨迹重规划方法。将重规划问题描述为非线性系统最优控制问题,在地心惯性坐标系中建立飞行器的状态方程。考虑轨道倾角偏差与远地点高度偏差,设计任务分区并完成目标轨道决策。根据不同分区确定相应的性能指标与约束条件,以目标轨道为圆轨道的任务为例,构建凸优化问题并采用序列凸规划方法完成求解,使轨道转移飞行器出现飞行偏差时能够预测可达范围并重新规划任务飞行轨迹。仿真结果表明这种方法可以在飞行任务中快速实现不同条件的轨迹重规划设计,对异常状态实现一定程度的补救。更多还原

【Abstract】 An on-line trajectory re-planning method based on mission partition is proposed to deal with abnormal states of orbital transfer vehicles. A re-planning problem is described as nonlinear optimal control problem,and the state equation of aircraft is established in earth centered inertial( ECI) system. Regarding deviations of orbit inclination and apogee altitude,a mission partition method is designed to complete decision for target orbit. According to different mission areas,the corresponding performance index and constraints are determined. By taking the mission of circular target orbit as an example,a convex optimization problem is solved via sequence convex programming. When a flight deviation occurs,orbital transfer vehicles have the ability to predict reachable range and re-plan a new trajectory. The simulation results show that this method can re-plan trajectories rapidly in different situations and remedy abnormal states to a certain extent.更多还原