Fig. 3
From: Impact of China’s high speed train window glass on GNSS signals and positioning performance
Average C/N0 at different elevation angles for GPS, GLONASS, Galileo, and BDS for GNSS receiver 1 and receiver 2. a Average C/N0 at different elevation angles for GPS, GLONASS, Galileo, and BDS during period 1 at receiver 1 (without glass, blue line and marker) and receiver 2 (with glass, red line and marker); b average C/N0 at different elevation angles for GPS, GLONASS, Galileo, and BDS during period 2 at receiver 1 (without glass, blue line and marker) and receiver 2 (without glass, red line and marker); c difference in average C/N0 for GPS, GLONASS, Galileo, and BDS between two receivers at different elevation angles during period 1