基于金星共振借力的太阳抵近探测任务轨道设计

对于太阳抵近探测任务，从地球直接发射探测器至太阳附近需要消耗巨大能量，通过多次金星借力飞行，可有效降低地球发射能量C₃及中途变轨的燃料消耗.本文研究基于金星共振借力的太阳抵近探测任务轨道优化设计，建立了连续共振借力和混合共振借力的转移轨道优化设计模型，并针对2025—2028年的发射窗口开展太阳抵近探测任务轨道优化设计.仿真结果表明，相比连续共振借力，混合共振借力可以有效缩短太阳抵近探测任务的轨道转移时间，对于地球发射能量C₃和中途变轨燃料消耗的影响未见明显的规律性，能量降低与序列中的共振比相关. 

Trajectory Design for Solar Approaching Detection Mission Using Multiple Resonant Gravity Assists of the Venus

To approach close to the Sun, direct launch from the Earth costs a lot of energy, which can be effectively reduced by the gravity assist of the Venus. In this paper, interplanetary transfer trajectories with multiple resonant gravity assists of the Venus are designed for a solar approaching detection mission. And design models for the trajectories with continuous resonant gravity assists, as well as resonant and non-resonant gravity assists combined are built. A mission launched between 2025 and 2028 is studied. The study shows that, compared with trajectory with continuous resonant gravity assists, trajectory with resonant and non-resonant gravity assists combined is useful for reducing transfer time of solar approaching detection mission. And its impact on the energy cost is not universal, which is related to the resonance ratio in the trajectory.