Abstract：LEO satellites have the characteristics of high signal strength and fast movement speed. The introduction of LEO satellites can improve the poor quality of GNSS receiver observation data and low positioning accuracy in complex environments such as mining areas, cities, and canyons. In this paper, a mixed configuration LEO constellation is used for positioning enhancement, and the simulated LEO satellite data is used to analyze the performance of enhanced GPS PPP with different numbers and configurations under different cut-off elevation angles. The results show that: 1) GPS joint LEO positioning can significantly increase the number of visible satellites and reduce PDOP value. 2) When the cut-off elevation angle is 30°, LEO satellites can significantly improve GPS positioning performance, and improve positioning accuracy and reduce convergence time. Among them, GPS joint the main sub-constellation (96+9) can improve positioning accuracy and reduce convergence time of HKSL station in the sub-constellation coverage area in N and U directions compared with LEO satellites with the same number of satellites.
