Fig. 4
From: Impact of China’s high speed train window glass on GNSS signals and positioning performance
TECR derived from pseudorange and carrier phase observations of GPS, GLONASS, Galileo, and BDS signals as tracked by receiver 1 (left column) and receiver 2 (right column) during test period 1 (GPS time: 3:00:00–9:00:00) (a and b) and test period 2 (GPS time: 11:00:00–14:00:00) (c and d). a TECR derived from GNSS pseudorange observations of receiver 1 (without HST window glass, left column) and receiver 2 (with HST window glass, right column) during period 1; b TECR derived from GNSS carrier phase observations of receiver 1 (without HST window glass, left column) and receiver 2 (with HST window glass, right column) during period 1; c TECR derived from GNSS pseudorange observations of receiver 1 (without HST window glass, left column) and receiver 2 (without HST window glass, right column) during period 2; d TECR derived from GNSS carrier phase observations of receiver 1 (without HST window glass, left column) and receiver 2 (without HST window glass, right column) during period 2