A Method for Recognition of Shape and Position Parameters of Railway Curves Based on Orthograph and Angle Graph

Abstract

A method for identifying shape and position parameters of railway curves based on positive vector graphs and angle graphs. The curves in the line generally have a structure of "first transitional curve-circular curve-second transitional curve", and its shape and position are composed of four characteristic points (straight slow point ZH, slow round point HY, round slow point YH, slow straight point HZ) and the radius R of the circular curve are determined by five parameters. The recognition algorithm comprehensively uses Hough transform, robust estimation and iterative method to process the positive vector graph and corner graph, and obtains two kinds of feature points and radii respectively. Because the positive vector graph and the angle graph have the characteristics of complementary advantages and disadvantages, the two results are complementary, and the one closest to the design value is taken. One of the innovations of the present invention is that in addition to the positive vector, the angle map recognition curve parameters are also selected; the second innovation is that the Hough transform in image processing is applied to data processing, and it is combined with the robust estimation method to realize automatic recognition. And the function of fitting multiple straight lines or parabolas; the third innovation is to complement the recognition results of the positive vector diagram and the angle diagram to obtain the best.

Description

technical field [0001] The invention relates to a method for recognizing shape and position parameters of railway curves based on positive vector diagrams and angle diagrams obtained by relative measurement on railways, which can be applied to retesting, maintenance and rectification of curved lines of railways and highways. Background technique [0002] When retesting and rectifying a curved line, it is necessary to determine an ideal curve with the highest degree of fit with the actual line. Accurately identifying the parameters of this ideal curve is the goal of the present invention. [0003] The most typical single-curved line among the curved lines has a structure of "first transitional curve-circular curve-second transitional curve". , slow straight point HZ) and the radius R of the circular curve are determined by five parameters [1] . Most literatures use the robust estimation method or the least squares method to determine these parameters, and the data used are ...

AI Technical Summary

Problems solved by technology

Due to its accumulation characteristics, the angle map greatly reduces random errors and has strong anti-interference, but the system error will become larger and larger due to the accumulation; the random error of the positive vector map is large, and the anti-interference is weak, but System error is small

Therefore, the advantages and disadvantages of angle graphs and positive vector graphs are complementary

Images