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High-speed Railway Track Integrated Inspecting by GNSS-INS Multisensor

Track measurement is extraordinarily fundamental and antecedent for ensuring high smoothness, high stability and high reliability of tracks to guarantee high-speed, safe and smooth running of high-speed trains. It at least includes control survey, route survey, and subgrade survey in the stages of design, construction, operation and maintenance. However conventional track measurement for high-speed railway mainly considered the situation in the stages of design and construction which has several problems including long retest period, high labor cost, and low measurement efficiency. It cannot fully meet the requirements of rapid detection for large-scale high-speed railway tracks in the stages of operation and maintenance, especially in China. To this end, a novel high-speed railway track integrated inspection solution based on global navigation satellite system (GNSS) / inertial navigation system (INS) and multisensor is proposed, and the corresponding track integrated inspection system is developed. It has been applied to the several actual track fine adjustment engineering projects for high-speed railway, and the results show that the proposed system realized the integration of the track subgrade deformation monitoring and the track geometric status absolute measurement and relative measurement for high-speed railway, and it has the lateral deviation accuracy of 2 mm and vertical deviation accuracy of 2 mm for track irregularity measurement in good consistency with the conventional track irregularity inspecting instrument (i.e., Amberg GRP1000) coupled with level at the faster average detection speed of 1 km/h, and the horizontal accuracy of 1 mm and the vertical accuracy of 1.5 mm for track subgrade deformation monitoring in real time, which fully satisfy the specific requirements for the Code for Engineering Survey of High Speed Railway, and significantly improve the detection efficiency while ensuring the measurement accuracy. The main components and process flow of the proposed solution have been systematically introduced in this paper, which can provide a reference to the following research and development of similar track inspection systems and solutions