LiDAR Anti-Interference via Time-Division Multiplexing
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Solution Overview
Problem
Multi-line LiDAR systems experience interference from multiple laser beams, leading to reduced detection accuracy due to optical crosstalk, which affects the quality of point cloud data.
Innovation Solution
The method involves determining and controlling laser emission units in different groups to ensure no optical crosstalk, using a preset rule for laser emission and reception to avoid interference, and employing filtering techniques to improve point cloud data accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple laser beams are emitted simultaneously to improve detection speed and coverage, then productivity is improved, but optical crosstalk occurs between beams which deteriorates measurement precision
Solution Approach 1:
The patent applies periodic action by dividing the measurement period into multiple time slots and enabling laser emission units to emit laser beams in different time slots rather than simultaneously. This time-division multiplexing approach allows multiple units to operate without causing optical crosstalk, thereby maintaining detection speed while improving measurement precision.
Solution Approach 2:
The patent segments the laser emission process by dividing multiple laser emission units into different groups and assigning them to different time slots within a measurement period. This segmentation prevents overlapping laser beams from interfering with each other, resolving the contradiction between high productivity and measurement precision.
2Productivity
If multiple laser emission units operate in parallel to improve detection coverage, then productivity is improved, but optical interference between units deteriorates measurement precision
Solution Approach 1:
The patent implements periodic action by organizing multiple laser emission units to operate in alternating time slots within each measurement period. This ensures that while multiple units contribute to expanded detection coverage, they do not emit simultaneously, thereby preventing optical interference and maintaining high measurement precision.
Solution Approach 2:
The patent applies dynamics by dynamically allocating different laser emission units to different time slots based on a preset rule. This dynamic scheduling allows the system to maximize detection coverage while avoiding fixed interference patterns, thereby resolving the contradiction between productivity and measurement precision.
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 effectively prevents crosstalk, enhancing the accuracy of point cloud data by ensuring that laser receiving units receive intended signals without interference, thereby improving detection precision.
Implementation Method 1
a laser emitter and a receiving sensor in the same group are in a serial relationship
Implementation Method 2
mainly obtain point cloud data through echoes of emitted lasers
Data Source
AI summary
This application discloses a LiDAR anti-interference method and apparatus, a storage medium, and a LiDAR. The method is applied to a LiDAR, and the LiDAR includes a laser emission array and a laser receiving array. The method includes determining at least two laser emission units to be turned on in a measurement period, controlling the at least two laser emission units to emit laser beams based on a preset rule, and controlling respectively corresponding laser receiving units of the at least two laser emission units to receive echo beams, to detect a target object. The at least two laser emission units to be turned on are in different laser emission groups, and the at least two laser emission units to be turned on satisfy a physical condition of no optical crosstalk.