High-Speed Railway Track Comprehensive Measurement System Based on GNSS/INS Multi-sensor

Track measurement is an importantly basic and preliminary work to ensure high-speed, safe and smooth operation of trains. In the stages of design and construction, the high-speed railway track measurement at least includes the layout and measurement of all control networks, the subgrade deformation monitoring, and the track irregularity measurement. However, there are several problems such as long retest period, high labor cost, and low detection efficiency, which cannot fully meet the needs of large-scale high-speed railway tracks rapid detection in the stages of operation and maintenance. So, a set of track comprehensive measurement methods of high-speed railway based on GNSS/INS multi-sensor are proposed, and the corresponding system is developed. It has been applied to the actual track fine adjustment engineering, and compared with the Amberg track geometry measurement system based on total station coupled with level, and the results show that the proposed system has realized the integration of track subgrade deformation monitoring and track geometry absolute measurement and relative measurement, which fully meets the requirements of the Code for Engineering Survey of High-Speed Railway, and significantly improves the measurement efficiency.