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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。
For Chang’e III landing orbit, according to the different stages of the situation to deal with one by one: 1 landing preparation phase: the orbital equation obtained by physical analysis. 2 main deceleration phase: the establishment of a suitable coordinate system, find the stage of the parabolic cubic polynomial equation. 3 rapid adjustment phase: after multiple analysis to determine the descending program. 4 rough avoidance section: After the division of the plate set the threshold to determine the scope of the landing. 5 Escape barrier: use the same principle to determine the final landing site. 6 slow down stage: as a free-fall movement. For the optimal control strategy, the force analysis of the soft landing process is taken into account, and the control strategy is obtained by considering the variation of the propulsion force, the fuel consumption per unit time and the flight speed with the flight time during landing.