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和化学推进系统相比,电推进系统能够独立地控制功率和推进剂流率,以获得最佳的组合,从而降低了系统的总重量。用电推进代替常用的肼系统,对于通信卫星所有重要的推进任务,都肯定能大大减轻卫星的重量。对所有的电推进操纵,还有另外的优点,就是能精确定位和具有较高的定点精度。目前可以用到通信卫星上的辅助电推进系统有三种:电热肼系统,太氟隆(Teflon,即聚四氟乙烯塑料)脉冲等离子体系统和水银离子推力器系统。主电推进将在八十年代中、后期,作为国家航宇局(NASA)的星际探索计划的派生部分而获得应用。
Compared with the chemical propulsion system, electric propulsion system can independently control the power and propellant flow rate, in order to obtain the best combination, thus reducing the total weight of the system. The replacement of the commonly used hydrazine system with electricity propulsion will certainly greatly reduce the weight of satellites for all important missions of communications satellites. For all electric propulsion operations, there is another advantage, that is, accurate positioning and high pointing accuracy. There are currently three types of auxiliary electric propulsion systems available for communications satellites: electrothermal hydrazine systems, Teflon (pulsed Teflon) pulse plasma systems, and mercury ion thruster systems. The main electric propulsion will be applied in the mid-to-late 1980s as a derivative part of NASA’s interplanetary exploration program.