基于分段瞄准点预报显式制导的月地返回轨道中途修正研究

On Midcourse Correction of Moon-Earth Return Trajectory Based on Subsection Aim Point Prediction Explicit Guidance

显式制导法算法简单,计算快速,使用灵活,实用性强,可运用于月地返回轨道的中途修正研究.基于瞄准点的显式制导法在得到瞄准点预报的前提下,利用二体模型计算修正点到瞄准点所需的修正速度作为多体模型下修正点到标称落点的修正速度.根据此方法,采用月球段及地球段分段进行中途修正的策略,给出了基于分段瞄准点预报显式制导的月地返回轨道中途修正方案.最后,算例仿真及蒙特卡洛仿真验证了该方案的适用性,得出了该方案的优势.

The explicit guidance method can be used in the research of the midcourse correction of Moon- Earth return trajectory, as the algorithm is simple, computationally fast and the thought is widely em- ployed in practice. On the premise that the aim point is predicted, the velocity increment needed from the correction point to aim point is computed using the two-body model to replace the one needed from correction point to nominal location point under the multi-body model. According to this method, the ex-plicit guidance correction scheme of Moon-Earth return trajectory based on subsection aim point prediction is presented, while the midcourse correction strategy is divided into moon-section and earth-section. Fi-nally, the adaptability of the scheme is validated by example simulation and Monte-Carlo simulation and the advantages of thd scheme are stuted.