Fig. 13From: Feasibility analysis of GNSS-based ionospheric observation on a fast-moving train platform (GIFT)Probability density functions of the TECR derived from the moving receiver for six travels (a–f) . They are calculated from the carrier phase measurements collected at the moving station on the MTR train. The probability density function for BDS in MTRS1709 is not displayed because of inadequate observationsBack to article page