Based on minimal fuel principle, the switching curve of ignition is confirmed by using optimization theory, and a braking scheme is designed for the process of the lunar probe vertical soft landing.

针对月球探测器垂直软着陆过程，基于耗燃最优的原则，利用最优化理论确定了点火切换曲线。设计出一种制动方案。

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Therefore, the direct collocation method is a viable approach to lunar probe soft landing trajectory optimization problem.

因此，直接配点法对于再入轨迹优化问题的求解是可行的。

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