Study On The Measuring Technque Of Track Geometry Based On Laser Tracker

Track geometry is the foundation of smooth running and safe operation of railway trains. Its measuring accuracy directly influences the running condition of railway trains. Therefore, studying and developing a high precision of track geometry measuring technique has a very important theoretical and practical significance.This thesis has study the present situation of the static detection technology of track geometry at home and abroad, and discussed some representative measuring methods of track geometry. Based on the analysis of the present situation of laser tracking measuring technology, and according to the advantages of laser tracking measuring system in measuring accuracy, measuring range, measuring efficiency and other aspects, a static measuring method of track geometry based on laser tracking measuring technology is put forward. In this thesis, the main study contents are as follows:(1) Study the three-dimensional(3D) coordinate calculation model of track geometry based on laser tracking measuring technology. Take the geometrical relationship between the 3D coordinates and track geometry of measuring points as the study object to establish the 3D coordinate calculation model of track geometry.(2) Study the coordinate transformation algorithm of laser tracking measuring track geometry. By analyzing conversion principle and solving method of conversion parameters at different spatial coordinate system, study the 3D coordinates of measuring points at track spatial coordinate system and coordinate system conversion algorithm of laser tracking measuring system. And determine the coordinate conversion relationship between the 3D coordinates of track geometry measuring points and spherical coordinate of laser tracking measuring system.(3) Analyze measuring error of laser tracking measuring track geometry. By analyzing conversion error analytical methods of different spatial coordinate system, study conversion error of laser tracking measuring system coordinate system and railway spatial coordinate system. By using the global sensitivity analysis method to quantitatively analyze critical meteorological factors affecting laser tracking measuring accuracy; and based on sample statistics law, quantitatively analyze the influence of measuring distance affecting laser tracking measuring accuracy, and determine the reasonable distance of laser tracking measurement.(4) Finally, around measuring station layout, target ball base design, data procession, optimization scheme of measuring method and other technical problems of laser tracking measuring system measuring track geometry, study track geometry measuring technical scheme based on laser tracking measuring technical, and develop data processing system of track geometry measuring based on laser tracking measuring technology. In order to verify the feasibility of track geometry measuring method based on laser tracking measuring technology, the laser tracking measuring system is used to test ballastless track geometry of high-speed rail.The results show that the track geometry measuring scheme based on laser tracking measuring technology proposed by this thesis has a high measuring accuracy and repeatability. It can meet the requirements of high speed railway ballastless track geometry measuring accuracy, and provides an accurate static detection technology for track geometry measuring of high-speed rail.