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再入可达域的快速准确计算,对于亚轨道飞行器可行着陆点的选择起着至关重要的作用。针对亚轨道再入可达域问题的特点,通过定义加权的横程、纵程组合性能指标函数,将可达域求解问题转化为组合性能指标最优的控制问题,采用求解精度高、收敛速度快的勒让德伪谱法快速计算得到再入可达域。仿真结果表明,该方法不仅能保持动力学模型精度,所得可达域也能很好地满足再入约束条件。
The rapid and accurate calculation of reachability and reachability fields plays a crucial role in the selection of feasible landing sites for suborbital vehicles. Aiming at the characteristics of reachable subdomain reachability problem, the problem of reachable domain can be transformed into a control problem with optimal combination of performance indexes by defining the weighted cross-range and vertical combination of performance index functions. The high precision and convergence speed Fast Legendre pseudospatigraphy fast re-entry accessible area. Simulation results show that the proposed method can not only maintain the accuracy of dynamic model, but also reach re-entry constraints well.