Fig. 14From: Feasibility analysis of GNSS-based ionospheric observation on a fast-moving train platform (GIFT)Ratio between the RMS derived from the moving station and static station for each satellite. The results of the six travels are presented in (a–f). The ratio value is calculated at the interval of 1 s, which means N is equal to 20. The red dashed line denotes the average value of the ratios of all the satellitesBack to article page