Survey of GNSS interference monitoring technology based on space-air-ground integrated networks

The Global Navigation Satellite System (GNSS) plays a central role in the integrated space-air-ground network, but its signals are vulnerable to interference, which seriously affects the system performance and application security. This paper comprehensively reviews the GNSS interference monitoring technologies for the integrated space-air-ground network. Firstly, the paper elaborates on the current development status of GNSS and the security threats, leading to the importance of interference signal monitoring. Then, the research status of GNSS interference signal classification, detection, direction finding and localization technologies are introduced. Based on this, an analysis is conducted on interference monitoring technologies and their development status from the perspectives of space-based, air-based and ground-based. Finally, the development trends of intelligent, networked, globalized and embedded collaborative interference monitoring technologies are explored. This paper aims to provide a comprehensive reference for the research and development of GNSS interference monitoring technologies, and help enhance the security and reliability of GNSS in the integrated space-air-ground network.