LiDAR Scanning Apparatus Placement for Symmetrical Cross Sections
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Solution Overview
Problem
The existing placement positions of first and second scanning apparatuses in LiDAR systems result in asymmetrical receiving cross sections, leading to deteriorated point cloud data and varying ranging performance on left and right sides, which affects the accuracy of three-dimensional space modeling.
Innovation Solution
A method to determine the optimal distance between the centers of the first and second scanning surfaces on the same horizontal plane, establishing a calculation model for the receiving cross section, and selecting a corresponding distance to ensure symmetrical distribution of cross section sizes relative to the rotation angle of the first scanning apparatus, thereby maximizing the receiving cross section size when the laser beam is at the center of the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the first scanning apparatus and second scanning apparatus are placed at existing mainstream positions, then the LiDAR can detect distances and build three-dimensional space models, but the receiving cross section sizes are asymmetrical on left and right sides, deteriorating point cloud data quality
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the placement positions of the first and second scanning apparatuses to create symmetrical receiving cross sections. Specifically, the first scanning apparatus is placed at a first distance from the center line, and the second scanning apparatus is placed at a second distance from the center line, where these distances are calculated to ensure symmetry. This resolves the asymmetry problem in existing mainstream placements while maintaining the ability to detect distances and build three-dimensional space models.
2Ease of operation
If the first scanning apparatus is positioned to reflect laser beams to the second scanning surface, then scanning functionality is achieved, but the receiving cross section size varies with azimuth angle, causing different ranging performance on left and right sides
Solution Approach 1:
The patent applies parameter changes by optimizing the placement parameters (distances from center line) of the scanning apparatuses. By calculating specific first and second distances based on optical path geometry, the system achieves consistent receiving cross section sizes across different azimuth angles. This ensures uniform ranging performance on both left and right sides while maintaining full scanning functionality across the field of view.
3Measurement precision
If the second scanning surface is positioned to receive reflected laser beams, then the LiDAR system can measure time delay and calculate distances, but the maximum receiving cross section is only achieved at center of horizontal field of view, reducing performance at edges
Solution Approach 1:
The patent applies equipotentiality by creating equal receiving cross section conditions across the field of view. The placement positions are calculated so that the second scanning surface receives reflected laser beams with consistent cross section sizes at different azimuth angles. This ensures that distance measurement accuracy is maintained uniformly across the entire field of view, not just at the center, by making all positions equivalent in terms of receiving performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures better point cloud data and uniform ranging performance on both sides of the LiDAR's field of view by maintaining symmetrical receiving cross sections, enhancing the accuracy and reliability of LiDAR systems in applications like autonomous driving.
Implementation Method 1
the first scanning surface is configured to reflect a laser beam incident on the first scanning surface to the second scanning surface
Implementation Method 2
A LiDAR usually measures a distance based on Time of Flight (TOF) by emitting laser pulses to an external scene in one emission direction and receiving an echo beam generated after the laser pulses are reflected by an object
Data Source
AI summary
The present disclosure provides a scanning apparatus placement method, an apparatus and a storage medium. The method includes: establishing a calculation model of a receiving cross section of a second scanning surface; based on the calculation model of a receiving cross section, within a preset rotation range of a first scanning apparatus and an allowable range of a first distance, obtaining a distribution set of sizes of cross sections corresponding to a size of the receiving cross section, an angle of the first scanning apparatus, and a first distance; and selecting a corresponding first distance from the distribution set of sizes of cross sections, when the sizes of the receiving cross sections are symmetrically distributed relative to an angle of the first scanning apparatus.


