In recent years, satellite communication technology has developed rapidly. Relying on its advantages of rapid transmission rate and large-scale remote data transmission, as well as the low orbit constellation's characteristics of proximity to the Earth, high signal landing power, low space decay, and rapid geometric change, the low orbit Internet system is expected to make up for the defects of the satellite navigation system in broadcasting rate and signal attenuation to solve the problems of low ground rate of traditional satellite navigation system and long convergence time of real-time PPP. Regarding specific project implementation, the low-orbit constellation can play four roles. First, as a "space-based monitoring station," it can enhance the information of current GNSS. Second, it can be used as a "navigation information source" to realize signal enhancement and information enhancement; Third, the low-orbit constellation can be used as the supplement and backup of the satellite navigation system and maintain the space-time reference independently. Fourth, the integration of satellite communication and navigation services should be realized to realize "integrated communication and navigation" at the user level. By combining the overall design of constellation navigation enhancement in the low-orbit Internet with the current status of GNSS operation services, we can realize complementary advantages and provide broader coverage, higher precision, and more robust time and space services. Firstly, this paper briefly introduces the development status of low-orbit satellites at home and abroad, analyzes the critical technologies of low-orbit satellites in navigation enhancement, especially in broadcast ephemeris parameter design and low-orbit constellation configuration, and focuses on the application and benefits of low-orbit satellites in space-based monitoring information enhancement, signal enhancement and communication integration. The prospects and challenges of applying low-orbit Internet satellite navigation are summarized. 

Low-orbit Constellation, Low Orbit Internet System, Navigation Enhancement, High Precision Positioning, Satellite Navigation System