将微波等离子推力器 (MPT)应用于“东方红三号”(DFH 3)卫星的推进子系统 ,完成其轨道转移和南 北位置保持任务。建立了卫星任务和系统优化计算模型 ,采用遗传算法对卫星轨道转移和位置保持任务进行优化模拟计算。讨论了推力弧段和推力等对卫星变轨时间、MPT累积工作时间、卫星干质量和有效载荷的影响。结果表明 ,采用MPT可大大减少推进剂工质消耗 ,增加有效载荷 ;变轨时间明显大于化学推进 ,但小于相同电功率的其他电推进。 The microwave plasma thruster (MPT) was applied to the propulsion subsystem of the DFH 3 satellite to complete its orbital transfer and north-south position keeping tasks. The satellite mission and system optimization calculation model are established. The genetic algorithm is used to optimize the satellite orbit transfer and position keeping task. The effects of thrust arcs and thrusts on satellite orbital time, cumulative working time of MPT, satellite dry mass and payload are discussed. The results show that the use of MPT can greatly reduce the propellant consumption of workers, increase the payload; orbital time significantly greater than the chemical propulsion, but less than the same electric power of other electric propulsion.