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中文摘要：
对于嫦娥三号着陆轨道,根据阶段的不同状况逐一处理:1着陆准备阶段:由物理分析得到轨道方程。2主减速阶段:建立适当坐标系,求出该阶段抛物线的三次多项式方程。3快速调整阶段:经过多重分析确定下降方案。4粗避障段:经过划分板块设定阈值,确定降落范围。5精避障段:用同样的原理确定最终降落地点。6缓速下降阶段:视作自由落体运动。对最优控制策略问题,对软着陆过程进行受力分析,考虑着陆过程中推进力、单位时间燃耗和飞行速度随着飞行时间的变化情况,从而得出控制策略。
英文摘要：
The different phases of the landing track for Chang E-3 have been dealt with respectively.For the landing preparation,the orbit equation has been obtained through physical analysis;for the main reduction,the appropriate coordinates have been established to work out the three polynomial equations of the phase parabolic;for the rapid adjustment,the threshold value has been set through parti-tion of plates;for the accurate obstacle avoidance,the same principle has been used to determine the final landing point;for the slow decline,it can be taken as the free falling process;for the optimal control strategy,the stress analysis has been carried out on the soft landing,with the thrust force in landing,unit fuel consumption and the variation of flight velocity with flight time,so as to obtain the control strategy.
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