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Map building method and system based on data fusion of two laser radars as well as map

A technology for radar data and map construction, applied in radio wave measurement systems, re-radiation of electromagnetic waves, utilization of re-radiation, etc., can solve the problems of insufficient representation of surrounding environment information, inability to meet real-time requirements, and large amount of calculation.

Pending Publication Date: 2020-01-07
BEIJING UNION UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This method is based on a single lidar sensor for three-dimensional mapping, but a single lidar point cloud data is insufficient for the surrounding environment information; and because the ranging algorithm needs to calculate the displacement of each feature point in the point cloud, when the environment is complex and the point cloud If the number is large, it will lead to a large amount of calculation, which will not meet the real-time requirements

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  • Map building method and system based on data fusion of two laser radars as well as map
  • Map building method and system based on data fusion of two laser radars as well as map
  • Map building method and system based on data fusion of two laser radars as well as map

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Embodiment 1

[0078] like figure 1 , 2 As shown, step 100 is executed, and the dual-radar calibration module 200 performs calibration and data fusion on the dual-lidar. The dual laser radar calibration refers to calibration of two laser radars at different positions, including spatial synchronization and / or time synchronization. Spatial synchronization refers to physical calibration, with one laser radar as the center, and the other laser radar adjusts the angle value and direction value for calibration to scan the same obstacle for spatial calibration. Space calibration is to use the rotation matrix and translation matrix of the three-dimensional coordinate system. The rotation of the three-dimensional coordinate system is expressed as the product of a vector and a square matrix of appropriate size. Set a vector in the 3D coordinate system The projections of point P on the XY plane, XZ plane, and YZ plane are point M, point Q, and point N respectively, Rotate the angle θ around the Z...

Embodiment 2

[0084] The present invention proposes a map construction method for dual laser radar data fusion. Firstly, the dual laser radars are calibrated and data fused; Secondly, the nearest neighbor iteration is used to correct the pose, and the optimal inter-frame transformation is obtained to realize the splicing of inter-frame point clouds; finally, the accurate point cloud map construction is completed.

[0085] 1. Dual laser radar calibration and data fusion:

[0086]Firstly, two laser radars in different positions are calibrated, including space synchronization and time synchronization. Spatial synchronization is to perform physical calibration, with one of the lidars as the center, and the other lidar adjusts the angle value and direction value for calibration to scan the same obstacle for spatial calibration. The time synchronization uses the ROS (Robot Operating System, robot operating system) mechanism to simultaneously receive the dual laser radar point cloud data, and the...

Embodiment 3

[0123] The invention proposes a map construction method for dual laser radar data fusion, including dual laser radar calibration and data fusion; based on a high-precision point cloud registration algorithm, inter-frame point cloud splicing is realized, and the completion accuracy is high The construction of the point cloud map.

[0124] 1. The present invention adopts dual laser radar data fusion to construct the map of unmanned vehicles. The dual laser radar supplements the characteristics of insufficient point cloud information of single laser radar, and provides relatively rich point cloud information for the construction of point cloud maps. For this reason, the present invention relates to calibration of dual laser radars and a point cloud information fusion method after calibration.

[0125] 2. The present invention proposes a two-step inter-frame point cloud registration algorithm, which realizes precise splicing of inter-frame point clouds, and then completes the cons...

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Abstract

The invention provides a map building method and system based on data fusion of two laser radars as well as a map. The method comprises a step of building a point cloud map and also comprises the following steps: performing calibration and data fusion on the two laser radars; performing interframe point cloud coarse registration by adopting a rapid space model point cloud registration algorithm; and performing pose correction by adopting the nearest neighbour iteration, so that optimal interframe transformation is obtained and accurate interframe point cloud splicing is realized. The method provided by the invention firstly performs space and time synchronization on the double laser radars and performs the data fusion on the laser radars; then the interframe point cloud coarse registrationis performed by adopting the rapid space model point cloud registration algorithm, and point cloud registration correction is performed by utilizing the nearest neighbour iteration point cloud registration, so that high-precision interframe point cloud splicing is realized; and finally building of the point cloud map is completed.

Description

technical field [0001] The invention relates to the technical field of unmanned driving, in particular to a map construction method, system and map based on dual laser radar data fusion. Background technique [0002] Vehicle-mounted laser radar LIDAR can automatically and quickly obtain high-precision, high-density surrounding three-dimensional coordinate information, and has important applications in the fields of urban three-dimensional reconstruction and terrain mapping. With the development of unmanned vehicle technology, LIDAR, as one of the important sensors in the perception field of unmanned vehicles, has important research value in the SLAM (Simultaneous Localization and Mapping, instant positioning and map construction) technology of unmanned vehicles. [0003] Lidar is one of the important sensors in the development of unmanned driving technology, which can build point cloud maps by scanning the surrounding environment. However, a single lidar point cloud data is...

Claims

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Application Information

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IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 张军刘元盛王庆闪程志明朱海东钟昊
Owner BEIJING UNION UNIVERSITY
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