长时间在轨上面级动力系统关键技术研究

上面级动力系统提供用于变轨所需要的动力，同时提供姿态控制、推进剂沉底、末速修正功能所需要的动力，将上面级和北斗导航卫星一起送入预定轨道。回顾了从早期的上面级动力系统选型论证到后续的关键技术攻关过程，对比研究了泵压式与挤压式动力系统的技术优势，分析了动力系统研制过程中的主要关键技术，并对关键技术的应用情况进行了总结，最后提出了长时间在轨上面级动力系统的后续发展建议。

Research on the Key Technology of the Upper Stage Propulsion System for Long-Duration Space Mission

Upper stage propulsion system provides the power needed for the orbit change, and provides the power needed for attitude control, vehicle propellant settling, final velocity correction, to send the upper stage and Beidou navigation satellites into the predetermined space orbit. This paper reviews the process from the selection and demonstration of the early upper stage propulsion system to the subsequent key technologies, compares the technical advantages of the pump-fed system and the pressure-fed system, and analyzes the main key technologies in the process of propulsion system development. And the application of the key technologies are summarized. Finally, the subsequent development suggestions of the upper stage propulsion system for long-duration space mission are put forward.