Mobile laser scanning system for railways and highways

Abstract

Mobile laser scanning has found wide application on railways and highways. Control of building approach dimensions is one of the areas of laser scanning application on railways. Determining dimensions using mobile laser scanning increases the productivity of field work. At the same time, processing the obtained data and determining the dimensions is a labor-intensive process. In some cases, when performing work on a railway track, the measurement and assessment of dimensions must be performed in real time. To determine the building approach dimensions in real time, a building approach dimensions control system (BAC) has been developed based on lidar, machine vision and computer learning. The BAC operation is based on measuring the coordinates of the surrounding space in a given sector and selectively selecting from the point cloud the coordinates of railway infrastructure objects that are specified in the digital project and entered into the database. Computer learning allows you to create a mathematical model of an object and recognize an image during in-kind measurements, which makes it possible to determine the dimensions in real time. One pass of the system along a section of the track ensures the definition of the track geometry and the clearances of approaching structures. The results of the SKG tests showed a high degree of the system's resistance to external factors, operational stability and provision of the required measurement accuracy. The system for monitoring the clearances of approaching structures on railways is designed for the acceptance into operation of completed railway repairs, assessment of oversized areas, execution of executive surveys and operational control during repairs.