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针对嫦娥三号软着陆的问题,根据霍曼转移轨道的原理和能量守恒公式计算出嫦娥三号在近远月点的速度.建立坐标系,求出近远月点的经纬度,从而确定了嫦娥三号的着陆准备轨道.以消耗燃料最少为目标对软着陆的6个阶段进行仿真,提出最优控制策略.如在主减速阶段通过构造约束条件确定最优控制参数.粗避障阶段用螺旋前进搜索算法,向外识别平坦度寻找最佳着陆区.同时运用高斯模糊算法减小计算量.经过对比,模拟结果与实际结果比较接近.
Aiming at the problem of the soft landing of Chang’e III, according to the principle of Hohmann transfer orbit and the energy conservation formula, the speed of Chang’e III at near and far points is calculated, the coordinate system is established, the longitude and latitude of the near and far points are calculated, The landing preparation trajectory of No. 3. The 6 phases of soft landing are simulated with the aim of least fuel consumption and the optimal control strategy is put forward, for example, the optimal control parameters are determined through the construction of constraints in the main deceleration phase. Forward search algorithm, outward recognition flatness to find the best landing area.At the same time using Gaussian blur algorithm to reduce the amount of computation.After comparison, the simulation results and the actual results are relatively close.