###### Abstract  
This article examines the positioning effect of integrated navigation after adding an LEO constellation signal source and a 5G ranging signal source in the context of China's new infrastructure construction. The tightly coupled Kalman federal filters are used as the algorithm framework. Each signal source required for integrated navigation is simulated in this article. At the same time, by limiting the range of the azimuth angle and visible height angle, different experimental scenes are simulated to verify the contribution of the new signal source to the traditional satellite navigation, and the positioning results are analyzed. Finally, the article compares the distribution of different federal filtering information factors and reveals the method of assigning information factors when combining navigation with sensors with different precision. The experimental results show that the addition of LEO constellation and 5G ranging signals improves the positioning accuracy of the original INS/GNSS by  
For example, under the mine, there is no GNSS signal, and it needs to rely on INS for a long time. However, the positioning error of tactical IMU will drift to about 10 m within one minute [5]. In this context, this article proposes to use Low Earth Orbit constellation enhancement and 5G signals as new sensor signal sources for integrated navigation simulation experiments to solve the positioning failure caused by the lack of GNSS signals in specific areas. Since 2020, the discussion of \"new infrastructure\" in China has heated up dramatically. As can be seen from relevant research reports [6; 7], in the new infrastructure, both satellite internet and 5G infrastructure construction can be used as a National Positioning Infrastructure (NPI). Satellite internet projects such as Telesat, OneWeb, and Starlink are mainly distributed in the orbit altitude range of 400 km to 1400 km. In China, constellations represented by \"Hongyan Constellation\", \"Hongyun Project\", \"Xingyun Project\", \"Celestial Constellations\", and \"Milky Way 5G\" were designed with heights ranging from 500 km to 1200 km. The above satellite constellations can all be called Low Earth Orbit Satellite Systems (LEO). Nowadays, the accuracy of low-orbit satellite orbit calculation can reach the centimeter-level [8; 9; 10]. The satellite launch and networking technologies have become more mature so that the number of available satellites has greatly increased, and some technical problems of low-orbit satellite navigation algorithms have been solved. Combining satellite load and application requirements, designing a low-orbit constellation that can be used for navigation, and forming a low-orbit constellation with integrated communication and navigation is an inevitable trend of constellation development [11; 12; 13]. At the same time, the research of combining LEO and INS for navigation is in the ascendant. Existing research shows that when there is no GNSS signal, the accuracy of integrated navigation using LEO constellation signal and INS is obviously higher than that using INS alone. This proves that using LEO/INS is feasible [14]. Taking advantage of the fast speed of LEO satellite, Doppler frequency shift measurement and positioning technology can be used in LEO satellite. The effect of tight coupling between this technology and INS is also very good, when GNSS is unavailable for 30 s, the final error is reduced from 31.7 m to 8.9 m [15; 16; 17; 18]. As another main component of the new infrastructure, the 5 th-generation mobile communication system (5 th-generation, 5G) is widely regarded as the foundation of the new generation of the internet. The Internet of Things and Industrial Internet based on 5G have also received widespread attention [19]. The international standards organization 3 GPP (3 rd Generation Partnership Project), which is leading the 5G communication system protocol standard, has formally defined the commercial application scenarios of 5G positioning requirements in the TR22.872 standard [20].