未来的在轨航天器将会产生越来越多的应用数据,诸如目前在轨飞行多年的国际空间站。为此,十分有必要基于IP协议簇建立一个具有高鲁棒性、高效率的信息传输网络,并设计一种有效的在轨接入机制。依据国际航天测控资源现状和天基测控发展趋势,分析航天器在轨接入互联网的技术难点,基于伪码扩频体制设计导频集管理策略和双向存储转发机制,解决在轨航天器的动态接入与断点续传问题,提出一种在轨航天器动态接入地面互联网方案,并通过仿真对系统工作性能进行初步评估。 Future on-orbit spacecraft will generate more and more application data, such as the International Space Station, which is currently in orbit for many years. For this reason, it is very necessary to establish a highly robust and efficient information transmission network based on the IP protocol suite, and to design an effective in-orbit access mechanism. According to the status quo of international spaceflight monitoring and control resources and the development trend of space-based measurement and control, this paper analyzes the technical difficulties of the spacecraft accessing the Internet in-orbit, designs the pilot set management strategy and bidirectional storage and forwarding mechanism based on pseudo-code spread spectrum system to solve the dynamic Access and breakpoint issues, proposed a spacecraft on-orbit spacecraft dynamic access to the ground and through the simulation of the initial performance evaluation of the system.