Lidar Laser Emission Timing to Identify Echo Crosstalk
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Solution Overview
Problem
Lidar systems suffer from inaccurate measurement of object information due to crosstalk between laser echoes, leading to discrepancies in measured distances.
Innovation Solution
Implement 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, using optical modules to process laser beams into discontinuous light spots, and a method to analyze point cloud data to filter out crosstalk echoes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single emitting module emits laser beams continuously, then the coverage area is continuous, but crosstalk between echoes occurs leading to measurement inaccuracy
Solution Approach 1:
The patent divides the emitting module into multiple sub-emitting modules (first emitting module and second emitting module). Each sub-emitting module emits laser beams in different time periods, creating discontinuous light spots that are staggered in time. This segmentation allows the system to identify and filter crosstalk by comparing echoes from different time periods, thereby improving measurement accuracy while maintaining continuous coverage through the combination of multiple segments.
2Measurement precision
If multiple emitting modules emit laser beams at different time periods, then crosstalk can be identified, but the complexity of the emitting apparatus increases
Solution Approach 1:
The patent combines multiple emitting modules to work together as a unified system. The first and second emitting modules emit laser beams in different time periods, and their light spots are merged to form a continuous light spot coverage. This merging approach allows the system to achieve crosstalk identification through time-staggered emission while maintaining the appearance of continuous coverage, balancing the increased device complexity with improved measurement accuracy.
3Measurement precision
If discontinuous light spots are generated, then echo crosstalk can be identified through time staggering, but the continuity of light spot coverage is broken
Solution Approach 1:
The patent employs periodic action by having the first and second emitting modules emit laser beams in alternating time periods. Each module generates discontinuous light spots during its active period, but the combined effect of both modules creates continuous light spot coverage over time. This periodic emission pattern allows the system to identify crosstalk through time staggering while maintaining the stability and continuity of overall light spot coverage through the coordinated operation of multiple modules.
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
Improves the accuracy of object information measurement by identifying and reducing crosstalk, resulting in more precise point cloud data and enhanced lidar performance.
Implementation Method 1
A lidar is configured to emit a laser beam, receive a laser beam (namely, an echo) reflected from an object after the laser beam is irradiated to the object
Implementation Method 2
measure related information of the object based on the echo, for example, a distance between the object and the lidar
Data Source
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.