Alternating LiDAR Emission Modules for Echo Crosstalk Separation
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Solution Overview
Problem
Conventional lidars suffer from low accuracy in measuring object information due to crosstalk between laser echoes, leading to inaccuracies in distance measurements.
Innovation Solution
A laser emitting apparatus with multiple emitting modules that emit laser beams at different time periods, generating discontinuous light spots to stagger echo reception and enable identification of crosstalk, improving accuracy by determining echo coverage areas and using optical modules to process laser beams into discontinuous spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If continuous light spots are emitted to improve coverage area, then measurement coverage is improved, but crosstalk between echoes increases reducing measurement precision
Solution Approach 1:
The patent applies periodic action by dividing the continuous light spot emission into periodic pulse signals. Multiple emitting modules emit laser beams in alternating time periods, creating discontinuous light spots that appear continuous when combined. This periodic pulsed emission allows the system to maintain comprehensive coverage while enabling temporal separation of echoes to identify and eliminate crosstalk, thereby resolving the contradiction between coverage area and measurement precision.
Solution Approach 2:
The patent segments the continuous emission process into discrete time periods assigned to different emitting modules. Each module emits discontinuous light spots in its designated time period, and the combination of these segmented emissions from multiple modules creates an overall continuous coverage effect. This segmentation in time domain allows echo separation to prevent crosstalk while maintaining spatial coverage.
2Productivity
If multiple emitting modules operate simultaneously to improve productivity, then scanning speed is improved, but echo crosstalk increases reducing measurement precision
Solution Approach 1:
The patent implements periodic action by assigning different time periods to multiple emitting modules. Instead of simultaneous operation, each module operates periodically in its designated time slot. This periodic temporal separation maintains high productivity through parallel module availability while enabling clear echo identification by eliminating overlap and crosstalk between modules.
Solution Approach 2:
The patent applies dynamics by making the emission timing of each module changeable and adaptive. The control module can dynamically adjust the time periods and emission sequences of different modules based on scanning requirements. This dynamic time-division multiplexing allows the system to optimize both productivity and measurement precision by flexibly allocating emission slots while maintaining temporal separation for accurate echo identification.
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
Enhances the accuracy of object information measurement by identifying and reducing crosstalk, resulting in improved point cloud data quality and reduced measurement errors.
Implementation Method 1
a distance between the object and the lidar and that is obtained by the lidar through measurement
Implementation Method 2
receive a laser beam (namely, an echo) reflected from an object after the laser beam is irradiated to the object
Implementation Method 3
using optical modules to process laser beams into discontinuous spots
Data Source
Figure 1~2
Figure 3~4
Figure 5~7(b)
AI summary
A laser emitting apparatus (310), a lidar (300), and a method for controlling a lidar (300) are provided, and may be applied to the field of laser technologies. The laser emitting apparatus (310) of the lidar (300) includes a first emitting module (3101) and a second emitting module (3102), a plurality of light spots generated when each emitting module emits a laser beam are discontinuous, and light spots generated when the first emitting module (3101) and the second emitting module (3102) emit laser beams alternate with each other. In the control method, the lidar (300) may determine target point cloud data based on a first point cloud data set and a second point cloud data set, where the first point cloud data set and the second point cloud data set are respectively point cloud data sets obtained by emitting laser light by the first emitting module (3101) and the second emitting module (3102); and then generate a target point cloud map based on the target point cloud data. Because each piece of point cloud data in the target point cloud data includes real image information, accuracy of object information measured by the lidar can be improved.