脉冲辅助的借力飞行轨道设计

以借助金星引力的火星探测器轨道设计为背景，针对借力前后可能存在的速度不匹配问题，提出了一种脉冲辅助借力的解决方式，分析了脉冲大小和脉冲作用方向对借力前后速度和能量的影响；其次，结合借力过程的理论分析，将之用到金星借力的火星轨道设计中，用遗传算法对借力飞行轨道的参数进行优化；最后，通过与无动力借力方式和深空机动方式所需要总能量大小的比较，得出脉冲辅助借力飞行方式需要更低能量的结论。

The Gravity-assist Trajectory Design with Impulsive

Taking the Mars exploration trajectory design with gravity-assist from Venus as background. A method, with impulse, for solving the unmatched problem which may exist in the velocity before and after the gravity-assist has been proposed. The effect of the velocity and energy before and after the gravity-assist has been analyzed. Then, combining the analyzes of the theory of gravity-assist, taking this method in the mars exploration trajectory design with gravity-assist from Venus, and optimizing the parameter of the gravity-assist trajectory with Genetic Algorithm. At last, the conclusion that the gravity-assist with impulse needs less energy, has been obtained from comparing with the total needed energy of the method of gravity-assist and the deep-space maneuver.