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A method to improve the accuracy of railway vehicle lidar scanning data

A vehicle-mounted laser radar and scanning data technology, which is applied in the field of improving the scanning data accuracy of railway vehicle-mounted laser radar, can solve the problems of inability to meet the accuracy requirements and low accuracy of laser radar data, and achieve accurate acquisition, high precision and strong operability. Effect

Active Publication Date: 2018-08-24
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

[0004] Usually, the accuracy of the laser radar data obtained directly based on the vehicle laser radar technology can only reach 5cm, especially when the acquisition is carried out on the existing railway, because the GPS signal is interfered by the high-voltage wires on the railway, the accuracy of the obtained laser radar data is even lower. (Usually only up to 10cm), unable to meet the accuracy requirements of existing line measurement

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  • A method to improve the accuracy of railway vehicle lidar scanning data
  • A method to improve the accuracy of railway vehicle lidar scanning data
  • A method to improve the accuracy of railway vehicle lidar scanning data

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 A method for improving the accuracy of railway vehicle-mounted lidar scanning data, which includes the following steps:

[0022] Step 1: Before carrying out vehicle-mounted lidar scanning, lay out a control sign 1 at every preset distance (400 meters) along the railway line to be tested;

[0023] Step 2: Arrange multiple GPS base stations along the railway to be tested along the direction of the railway to be tested, and scan the vehicle-mounted laser radar system along the railway. During scanning, the vehicle-mounted laser radar system and the GPS base station work together to obtain railway vehicle-mounted laser radar point cloud data ;

[0024] Step 3: Based on the railway basic control network, the three-dimensional coordinates of the central point of the control mark 1 in the railway engineering coordin...

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Abstract

The invention discloses a method for increasing railway onboard laser radar scanning data precision. The method comprises steps of: 1, laying control signs at preset intervals along a railway to be tested; 2, enabling an onboard laser radar system to scan along the railway to obtain railway onboard laser radar point cloud data; 3, based on a railway base control network, measuring the three dimensional coordinates of the central point of the control sign in a railway engineering coordinate system by using a total station free station setting method; 4, extracting the coordinates of the central point of the control sign from the railway onboard laser radar point cloud data, and correcting the railway onboard laser radar point cloud data according to a difference value between the coordinates of the central point of the control sign extracted from the railway onboard laser radar point cloud data and the three dimensional coordinates of the central point of the control sign in the railway engineering coordinate system measured by the total station. The method is simple and feasible in operation and enables the railway onboard laser radar data precision to satisfy existing line repetition measurement precision requirement.

Description

technical field [0001] The invention relates to the technical field of retesting of existing railway lines, in particular to a method for improving the accuracy of railway vehicle-mounted lidar scanning data. Background technique [0002] For the maintenance and repair of existing railways, slope reduction, improvement of line alignment, and construction of double tracks, it is necessary to accurately obtain 3D information of the railway and its auxiliary structures through retesting of existing lines. At present, the existing line survey is mainly based on the manual survey method. However, with the rapid increase of railway speed in recent years, the trains are traveling at a high speed and the departure density is high. The traditional existing line measurement method has great safety hazards. It is urgent to develop an efficient and safe existing line measurement method. [0003] Vehicle-mounted lidar technology is an active mobile measurement technology that integrates...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/88
CPCG01S17/88
Inventor 李海亮冯光东熊国华郭良浩汤建凤刘冰洋胡玉雷刘善勇朱雪峰刘志友徐雪花
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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