中文摘要：

文章研究了CE-2小行星探测任务的转移轨道设计.首先分析了已编目小行星的轨道分布及运动特性,基于飞行任务约束选择了合适的交会目标.其次,基于微分修正法研究了转移轨道的设计,通过约束修正量改善了微分迭代收敛性能,给出了转移轨道的遍历搜索设计流程.最后,在CE-2卫星剩余推进剂的约束下,基于CE-2精密轨道设计了能量最优转移轨道,并分析了转移轨道的测控和通信约束条件.研究结果表明,2012年内合适的小行星交会目标为4 179和214 869,交会小行星4 179的最小速度增量约97.312 m/s,剩余推进剂满足任务需求,同时国内测站可以满足测控需求.

英文摘要：

Transfer trajectory design of the CHANG＇ E-2 asteroid exploration mission planned to further validate our deep space exploration capability and utilize the remaining propellant after the Sun-Earth/Moon libration point mission is studies in this paper.Firstly,the orbit distribution and kinetic characteristics of the catalogued asteroids at present are analyzed.The appropriate asteroids are selected.Secondly,the transfer trajectory design based on the differential correction is studied.The iterative convergence is improved by constraining the correction variant.As a result,the transfer trajectory design flow of global searching is presented.Finally,the transfer trajectory with the least propellant consumption is designed according to the accurately CHANG＇ E-2 orbit and the propellant constraint.The TT＆C condition of the transfer trajectory is also analyzed.The research result shows that the appropriate asteroids in 2012 are 4 179 （Toutatis） and 214 869 （2007 PA8）,and the least velocity increment is about 97.312 m/s for 4 179 flying-by.Therefore the remaining propellant is sufficient for the mission.Furthermore,the domestic tracking stations can meet the TT＆C needs.