Evaluation and analysis of enhanced positioning performance for typical low earth orbit satellite constellation navigation

In recent years, the development of low-orbit satellite navigation enhancement systems has been rapid. Low-orbit navigation satellites have relatively low orbital altitudes, high signal landing power, and fast speed, which are expected to solve the problem of long convergence time for real-time precise single-point positioning of GNSS. This article evaluates and analyses the enhanced positioning performance of typical low-orbit satellite constellations. The study selected three representative low-orbit satellite constellations, combined with GPS, BDS, and GALILEO global satellite navigation systems. By establishing evaluation models and simulating data, a comprehensive evaluation was conducted on the coverage performance of precise point positioning. The results indicate that low-orbit satellite constellations have significant advantages in navigation enhancement and can effectively shorten the convergence time of GNSS precise point positioning. At the same time, the study also revealed the performance differences between different constellation systems, providing important references for the design and optimization of future low-orbit satellite navigation systems.