The Measurement of Railway Using VRS GPS

Abstract

This study is based on those data gathered on a 450m-long railway with a VRS GPS. In addition, certain location data on a railway were gathered through three 'Continuous VRS GPS' measurements and one 'Stop & Go VRS GPS' measurements while a railway-maintenance vehicle with GPS receivers mounted on its left & right sides was moving, Based on these location data, an average inter-rail space was analyzed. As a result of the analysis, the inter-rail space ranged from 1480mm to 1530mm. Based on the standard design dimension of an inter-rail space equal to 1,500mm and the average VRS GPS accuracy of ±3cm permissible in South Korea, the range was acceptable. Furthermore, if the center of a GPS receiver is placed over the vertical line of a rail center, more accurate location data on the railway could have been gathered.

An Improved Multi-Sensor MTI Time-Series Fusion Method to Monitor the Subsidence of Beijing Subway Network during the Past 15 Years

“…Traditional geodetic techniques, photogrammetric methods (drones, etc. ), and GlobalPositioning System (GPS) techniques have been widely used in urban land subsidence monitoring and infrastructure health assessment [9][10][11][12]. However, these methods all have the limitations of high labor intensity, high cost, short observation time, and limited observation range.…”