Spacecraft reentry trajectory optimization is a kind of optimal control problem.
飞行器再入轨迹优化是一类最优控制问题。
Using numerical calculation, optimal roll program, the ratio of lift and drag, reentry Angle and reentry time of spacecraft are gotten.
通过数字计算，得到飞船的最优滚转程序、升阻比、再入角和再入终端时间。
Spacevehicles such as spacecraft and space shuttle are subjected to severe aerothermal environment with the peak heating at height of 60~90km while they maneuver to reentry the earth's atmosphere.
航天飞行器在再入大气过程中会受到严重的气动加热。返回式卫星、飞船返回舱及航天飞机等采取高空机动再入，再入时间长，其峰值加热过程一般在60-90千米高空。
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