Abstract: Space is the new frontier of a country. Space activities are important embodiment of national will and strategic intention, and important guarantee for the expansion of national interests. Space security has become an important part of national security. Space situation awareness refers to the acquisition and cognition of space situation information, including space target monitoring and space environment monitoring. It is the basis for further space control and space confrontation. Firstly, this paper reviews the development of relevant regulations in the field of space situational awareness, introduces the implementation of several typical situation awareness projects in the field of high orbit in the United States, and summarizes four key technologies, including space entry, autonomous operation, rendezvous and docking navigation and control, and multi angle stereo imaging technology. Finally, this paper gives some suggestions on the establishment of situation awareness system, spacebased autonomous sensing system, and the development of space attack and defense confrontation capability.

Key words: high orbit, space security, situation awareness