Existing railway turnout junction extracting method based on three-dimensional laser scanning technology

Abstract

The invention discloses an existing railway turnout junction center extraction method based on a three-dimensional laser scanning technology. The method comprises the steps of conducting observation station splicing and gross error elimination on original data; resampling the data; filtering the original point cloud data based on the rail surface elevation; performing Hough transformation on the filtered point cloud data, and detecting a straight line; fitting the point cloud data belonging to the same straight line by using a least square method, and calculating a straight line slope k1 and an intercept b1; re-screening the point sets belonging to the same straight line; carrying out second-time least square fitting, accurately calculating the slope k2 and the intercept b2 of the straightlines and finally extracting four straight lines, wherein two straight lines belonging to the same group of rails are parallel, and forming two groups of parallel straight lines; calculating intersection points of the two unparallel straight lines wherein the coordinate average value of the four intersection points is the fork center coordinate. The beneficial effects of the invention are that the method can improve the measurement precision of an existing railway turnout, and avoids the huge potential safety hazards of the online operation of a measurer.

Description

technical field [0001] The invention belongs to the technical field of railways, in particular to a method for extracting existing railway turnout centers based on three-dimensional laser scanning technology. Background technique [0002] At present, manual measurement is still used in the measurement of railway turnouts. On-site measurement is used to calibrate the position of the switch center, and then its coordinates are measured with a total station or GPS-RTK. [0003] In my country's railway construction, the most commonly used is the ordinary single turnout, also known as the single turnout, the structure is as follows figure 1 shown. When determining the switch center, first determine the type of turnout, and then determine the front end length a of the model, find the basic rail joint at the front end of the turnout on the spot, measure the value a from the center of the line connecting the two rail joints along the center line of the line, and then determine The...

AI Technical Summary

Problems solved by technology

[0004] From the above measurement process, it can be seen that the existing measurement methods of turnout center are greatly affected by manual operation errors, and the measurement accuracy of turnout center is difficult to guarantee

At the same time, because there are trains running on the existing railway, there is a great potential safety hazard in the measurement operation on the existing railway.

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