Fig. 5
From: Impact of China’s high speed train window glass on GNSS signals and positioning performance
Number of tracked GNSS satellites of two receivers during the two test periods. GNSS denotes a combination of GPS, GLONASS, Galileo, and BDS. a Number of tracked satellites of receiver 1 (without glass, top) and receiver 2 (with glass, middle) and their difference (bottom) during test period 1; b Number of tracked satellites of receiver 1 (without glass, top) and receiver 2 (without glass, middle) and their difference (bottom) during test period 2