Fig. 1From: Impact of China’s high speed train window glass on GNSS signals and positioning performanceTwo GNSS receivers were placed on a building rooftop on the campus of Southwest Jiaotong University, Chengdu, China on 9 March 2019. During period 1 (GPS time 3:00:00–9:00:00), receiver 1 was in the open-sky observation environment (right) and an HST window glass was placed over the antenna of receiver 2 (left)Back to article page