基于非线性最优终端匹配的再入轨迹快速规划研究

针对新型升力式再入飞行器再入轨迹终端需满足多约束条件的情况,研究了一种基于非线性最优终端匹配的再入轨迹快速规划方法。根据升力式再入特性和任务需要,将飞行器再入轨迹划分为初始下降段、准平衡滑翔段和终端匹配段,其中初始下降段和准平衡滑翔段采用单参数迭代搜索法快速生成轨迹,终端匹配段则基于一种全局插值多项式来离散化控制变量,并采用复形调优法对这一参数化最优问题进行非线性优化求解。仿真结果表明,轨迹快速规划方法可以在半分钟内生成一条满足多终端约束的再入轨迹,并具有较高的精度。该方法对于未来新型升力式再入飞行器具有很好的工程应用前景。

Rapid Reentry Trajectory Planning Based on Nonlinear Optimization of Terminal Matching

A rapid reentry trajectory planning method based on nonlinear optimization of terminal matching has been studied for the new lifting reentry vehicle with strong terminal constraints. Considering the lifting reentry characters and mission requires, the reentry trajectory is divided into three phases: initial descent phase, quasi-equilibrium glide phase and terminal matching phase. One-parameter iterative method is used for the rapid trajectory planning of initial descent phase and quasi-equilibrium glide phase. The control variable of terminal matching phase is discretized based on global interpolation polynomial, and then be optimized with complex method. Simulation results show that this rapid reentry trajectory planning method can generate a high precision reentry trajectory with strong terminal constraints in a half minute. This method can be used for the future new lifting reentry vehicles.