Point cloud error correction method based on self-made ground-based laser radar perpendicularity error

Abstract

The invention discloses a point cloud error correction method based on self-made ground-based laser radar perpendicularity error, the method mainly aims at a scanning mode of self-made laser radar system 45 degrees mirror rotating cooperated with a tripod head, a self-made laser radar system point cloud error correction model is established through calculating influence from pitch axis and azimuth axis perpendicularity error to self-made system angle measuring error, a high precision 3D scanner is adopted to solve perpendicularity error for scanning point cloud coordinates as a true value, so that error correction from self-made laser radar system perpendicularity error to target point cloud error is realized. The method mainly comprises following steps: 1) a model of self-made laser radar 3D imaging system angle measurement error caused by perpendicularity error is established and simplified; 2) a self-made laser radar 3D imaging system point cloud error model is obtained; 3) the perpendicularity error in the self-made laser radar 3D imaging system point cloud error model is solved, and the self-made laser radar system target point cloud is corrected according to the model.

Description

technical field [0001] The invention relates to the technical field of laser radar measurement, in particular to a point cloud error correction method based on self-made ground-based laser radar verticality error Background technique [0002] Lidar measurement technology is a new active remote sensing technology that has developed rapidly in recent years. It generally uses non-contact measurement technology and has a wide range of applications in remote sensing, military detection, oceanographic mapping, and atmospheric exploration. Based on the traditional single-point measurement technology, the three-dimensional scanning measurement technology in LiDAR can quickly obtain high-resolution point cloud data on the surface of the target object through high-speed laser scanning. This technology has the advantages of simple data processing, rapidity, It has the advantages of initiative, strong anti-interference ability, high measurement accuracy and large range. However, the sc...

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Problems solved by technology

This type of method obtains a system error correction model for all three-dimensional coordinate measurement systems. Its disadvantage is that the parameters of the system error model have no physical meaning, and it does not conduct theoretical analysis on the scanning mode of the system itself from the perspective of error sources. Therefore, it relies on large sample data to achieve Accurate correction; the above-mentioned patents include "a correction method for long-distance scanning laser radar measurement error" disclosed in Chinese patent 201710014687.8

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