Abstract: Mengzhou spacecraft includes an Earth version and a lunar version, which respectively perform rendezvous and docking with the Chinese space station in earth orbit and the Lanyue spacecraft in lunar orbit. During the design process of Mengzhou spacecraft, two prominent challenges emerged: deep integration of the autonomous high fault-tolerance GNC systems for rendezvous and docking with the Chinese space station and the Lanyue spacecraft, autonomous guidance, navigation and control during rendezvous and docking process. In this study, the specific situation of two problems is described, the problems' solutions are given, and the solutions' effects are verified by ground testing. The results indicate that the rendezvous and docking of the Mengzhou Earth spacecraft and the Mengzhou lunar spacecraft adopt an autonomous fault-tolerant system based on TTE and 1553B hot backup communication and four-model redundant computer, achieving the goal of continuous fault-tolerant operation under one fault, continuous safe operation under dual faults. Through autonomous navigation with multiple sensors and multi-stage autonomous coordination guidance and control, the Mengzhou Earth spacecraft has achieved autonomous rendezvous and docking with the Chinese space station, and the Mengzhou lunar spacecraft has achieved autonomous rendezvous and docking with the Lanyue spacecraft.

Key words: Mengzhou spacecraft, rendezvous and docking, integrative design, autonomous fault-tolerance, autonomous control