Multi-Line LiDAR Layout With Single Receiver to Cut Crosstalk
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Solution Overview
Problem
The existing multi-line laser radars suffer from unstable working performance due to high signal crosstalk between detectors, which are limited in number by the radar's volume, leading to inefficient hardware costs and reduced detection accuracy.
Innovation Solution
A multi-line laser radar design using a 'multiple transmit and single receive' structure with a scanning rotating mirror having reflectors with different reflection angles for each laser beam, reducing detector count and enabling multiple scanning lines without increasing laser count, and employing optical fibers for precise beam collimation and arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple detectors are used to increase scanning lines, then detection coverage is improved, but signal crosstalk increases and working performance becomes unstable
Solution Approach 1:
The patent merges multiple detection functions into a single detector by using a rotating mirror to direct laser beams from multiple lasers (n lasers) to different spatial positions. This single detector receives echo signals from all n lasers sequentially, eliminating signal crosstalk between multiple detectors while maintaining multi-line scanning capability. The rotating mirror acts as a dynamic beam director that spatially separates the detection paths of multiple lasers.
Solution Approach 2:
The patent employs a dynamic rotating mirror that changes its orientation continuously during operation. The mirror rotates to reflect laser beams from n different lasers to different spatial positions, enabling the single detector to sequentially receive echo signals from multiple directions. This dynamic beam steering mechanism allows the system to achieve multi-line scanning coverage without requiring multiple stationary detectors.
2Volume of moving object
If detector distance is reduced to fit within radar volume, then device compactness is improved, but signal crosstalk between detectors increases
Solution Approach 1:
The patent introduces a rotating mirror as an intermediary component between the lasers and the detector. This mirror mediates the optical paths by dynamically directing laser beams from n lasers to different spatial positions before they reach the single detector. The intermediary mirror enables spatial separation of detection paths without requiring physical separation of detectors, thus eliminating crosstalk while maintaining compact form factor.
3Adaptability or versatility
If multiple lasers are used to increase scanning lines, then detection coverage is improved, but hardware costs increase
Solution Approach 1:
The patent makes a single detector universal by enabling it to perform multiple detection functions through the rotating mirror mechanism. The same detector receives echo signals from n different lasers at different time moments, making one detector serve the function of n detectors. This multi-functionality approach reduces hardware costs while maintaining the capability to implement multi-line scanning with n lasers.
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 design improves working performance, reduces hardware costs, and enhances detection accuracy and distance by minimizing signal crosstalk and optimizing beam distribution, suitable for intelligent transportation applications.
Implementation Method 1
an optical collimating unit, configured to collimate n laser beams
Implementation Method 2
a scanning rotating mirror including a rotation axis and m reflectors rotating around the rotation axis... at least two reflectors existing in the m reflectors have different reflection angles for a same laser beam
Implementation Method 3
a detector, configured to receive echo signals of the reflected n laser beams
Data Source
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AI summary
A multi-line laser radar includes a first radar component, where the first radar component includes n lasers, an optical collimating unit, a scanning rotating mirror, and a detector, where n is greater than 1. Each laser is configured to emit one laser beam to the optical collimating unit. The optical collimating unit is configured to collimate n laser beams, where the collimated n laser beams are incident on a target reflector of the scanning rotating mirror. The scanning rotating mirror includes m reflectors rotating around a rotation axis, where a rotation plane of the rotation axis is perpendicular to an arrangement direction of the collimated n laser beams, and m is greater than 1. The target reflector is configured to reflect the received collimated n laser beams to a detection area of the first radar component. The detector is configured to receive echo signals of the reflected n laser beams in the detection area. This application provides a multi-line laser radar structure of "multiple transmit and single receive", so as to avoid a signal crosstalk between detectors, improve working performance, and reduce costs.