Fig. 5From: Feasibility analysis of GNSS-based ionospheric observation on a fast-moving train platform (GIFT)TECR derived from pseudorange (a) and carrier phase measurements (b) from GNSS satellites (GPS, GLONASS, Galileo, and BDS). The data were collected at the SS receiver beside the MTR railway line from 15:08 to 16:28 HKT on 19 June 2017Back to article page