Phase Multipath Detection and Its Effect on Positioning Based on Multi-GNSS

The multipath effect is one of the main error sources of Global Navigation Satellite System (GNSS) positioning. However, due to the complexity of the multipath effect in the time domain and space domain, even with the improvement of multiple systems, the error cannot be eliminated by conventional methods. Nevertheless, the multipath effect will have different effects on carrier phase observations at different frequencies, and the carrier-to-noise-power-density ratio (C/N0) can reflect this effect. Based on this basic idea, scholars have proposed two kinds of multipath detection methods: reference function method and double statistics method. There are significant differences between the constellations and the signal of different systems, it is necessary to demonstrate the different results of the reliability of each system, and then explores the feasibility of using the phase multipath detection method to improve the positioning accuracy. The experimental results show that after two methods have been corrected, the positioning accuracy is significantly improved, and the improvement in the N and E directions is relatively weak, but the improvement in the U direction is particularly obvious: the accuracy of the reference function method correction is increased by 56.00%, and the improvement of the double statistic method correction is 63.19%. At the same time, these two methods can be applied not only to the static, but also to the dynamic real-time domain, providing a new idea for the study of phase multipath.