Current Progress and Future Developments of PTABC LEO Navigation

The availability and security of GNSS services under increasingly complex jamming, spoofing and occlusion application environments are of great concern. The monitoring and protection of the electromagnetic environment in the navigation band is being strengthened by the international community. Global navigation jamming monitoring and locating based on LEOs (LEO satellites) has become a research hotspot, and efforts to seek complement backup measures. The integration of LEO narrowband Internet of Things, mobile communications, broadband Internet constellation to achieve complement backup of GNSS positioning and timing has become a hotspot of research as well as construction at home and abroad. At the same time, the demand for global fast centimeter-level positioning services has been proposed due to the development of autonomous driving and smart cities. Based on the LEO constellation, the new system of “space-based monitoring + signal augmentation” to reach the global fast centimeter-level positioning service has become a hotspot of research and verification at home and abroad. In this paper, from the perspective of Protection, Toughen, Augment, Backup, and Complement (PTABC) of GNSS based on LEO constellation, the related domestic and foreign technology research status and system construction status are classified and summarized. The PTABC-LNMS (PTABC LEO Navigation Meta-system) architecture, main performances and technology system are proposed. From the perspective of system implementation such as LEO navigation jamming source monitoring and locating, dedicated LNA (LEO Navigation Augmentation), LNA based on C&N (Communication and Navigation) fusion, and C&N backup, the main performance and development space are researched with representative system, and the challenges and opportunities of the system are presented. Finally, from a technical perspective, a short term and medium to long term development prospects are given for the PTABC-LNMS.