Mile Mismatch Correction Method of Track Geometry Data and Its Application

Track geometry state is one of the important indexes to measure the comfort and stability of train. However, large amount of field data analysis indicates that the mile mismatch exists in different measurement of track geometry data in the same track section, which may cause a great adverse impact on analysis and mastering the development rules of track geometry. To solve such problems, a mile mismatch correction method based on the identification of curve characteristic and track geometry data characteristic is proposed. First, according to curve characteristics and the corresponding response on track geometry data while train passes, the mile error between track geometry data and curve can be calibrated. Then, in association with the method of least-squares and dynamic programming, a mile match calculation model is built and used to match the miles of track geometry data inspected at different time in the same section. The mile match method is developed by MATLAB and tested by track geometric data from several railway lines. The practice results show that the method is accurate, efficient and reliable.