一种跳跃式再入鲁棒轨迹规划方法

A Robust Trajectory Planning Method for Skip Reentry

针对跳跃式再入轨迹对再入点状态偏差及气动参数变化具有鲁棒性的需求,提出一种状态扩维的再入轨迹优化问题建模方法,该方法通过将过程约束转换为等式约束的方式,重新定义了过载约束及动压和热流密度约束,并分别建立了增广再入模型和扩展增广再入模型,保证了多约束条件下再入轨迹优化问题对初值漂移和模型参数扰动的适应能力.数学仿真结果表明:提出的方法对动力学初始状态和气动参数偏差具备强鲁棒性,轨迹的动压、过载和热流密度约束满足设计需求,且精确规划到期望落点.因而具有较好的工程背景和意义.

Aiming at the problem of skip reentry trajectory planning,and considering the initial state deviations and the uncertainty of the atmosphere’s parameters,a modeling method for the reentry trajectory optimization problem with state augmention is proposed.The constraints of dynamic pressure,load factor and heating rate are redefined by transforming path constraint into equality constraint.Moreover,the augmented reentry model and the extended augmented reentry model are established respectively to ensure the adaptability of the reentry trajectory optimization problem to initial shift and parameter disturbance.Numerical simulations demonstrate that the proposed method has the robustness to the initial state deviations and the uncertainty of the atmosphere’s parameters,the constraints of dynamic pressure,load factor and heating rate satisfy the design requirements,and the trajectory is precisely planned to the desired landing point,therefore it has good engineering background and significance.