Overview of the Development of Low Earth Orbit Satellite Navigation Enhancement Technology

Low Earth Orbit (LEO) satellites, with their unique advantages in constellation and signal, are gradually gaining attention and favor in the world's satellite navigation field, and are expected to become a new increment in the development of the new generation of satellite navigation systems.With the low orbit constellations represented by the Starlink program in the United States becoming a new battlefield for global competition for space strategic resources, the development direction of satellite navigation enhancement is also gradually tilting towards the low orbit field, becoming a new growth and empowerment point for the next generation of satellite navigation.This article first introduces two major types of low orbit navigation enhancement technologies, namely information enhancement and signal enhancement; Summarized the current development status of global low orbit satellite navigation; Explained the key technologies for enhancing low orbit navigation; The focus was on discussing the new development opportunities brought by low orbit navigation enhancement technology for building a Global Navigation Satellite Systems (GNSS) global space-based monitoring network, providing global quasi real time high-precision services, and providing global high integrity monitoring services; Finally, the inspiration and suggestions for the development path of low orbit navigation enhancement technology were summarized.