LiDAR Emission Block Control for Crosstalk Reduction
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Solution Overview
Problem
Current LiDAR systems face challenges in improving ranging performance and point cloud density, leading to issues with optical crosstalk and frame rate accuracy.
Innovation Solution
The method involves controlling a LiDAR system by determining emission blocks to emit laser beams in a measurement cycle, ensuring no optical crosstalk by using time coding sequences generated by a linear feedback shift register to minimize interference, and fusing echo data from receiving units to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of emission units emitting laser beams in parallel is increased, then detection efficiency is improved, but optical crosstalk increases
Solution Approach 1:
The emission array is divided into multiple emission blocks, each containing multiple emission units. By controlling specific emission blocks to emit laser beams in parallel while others remain inactive, the system achieves high detection efficiency without causing optical crosstalk between adjacent emission units. This segmentation allows selective activation of emission blocks based on spatial separation requirements.
Solution Approach 2:
The LiDAR system operates in periodic measurement cycles, where different emission blocks are activated in alternating periods. In one measurement cycle, certain emission blocks emit laser beams while others are turned off, and in the next cycle, the pattern is reversed or shifted. This periodic activation pattern enables parallel emission from multiple blocks without continuous optical crosstalk interference.
2Speed
If multiple emission blocks emit laser beams simultaneously, then measurement speed is improved, but frame rate accuracy deteriorates
Solution Approach 1:
The system incorporates a control mechanism that tracks the activation state of each emission block and adjusts the timing and duration of laser beam emission accordingly. By providing feedback on the emission status and receiving corresponding echo signals, the system maintains accurate frame rate measurement even when multiple emission blocks are activated in parallel during different measurement cycles.
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 a high frame rate and reduces optical crosstalk, resulting in improved measurement accuracy and flexibility, effectively addressing the limitations of existing LiDAR systems.
Implementation Method 1
each emission block includes multiple emission units 111 that emit detection laser beams
Implementation Method 2
the laser echo refers to an echo formed after the laser beam is reflected by a target object
Implementation Method 3
controlling a receiving block in the laser receiving array that corresponds to the emission block to receive a laser echo
Data Source
AI summary
This application discloses a LiDAR controlling method, the LiDAR includes a laser emission array and a laser receiving array, and the method includes: in a measurement cycle, determining at least one emission block to be turned on in a current measurement cycle from the laser emission array, where the laser emission array includes multiple emission blocks, and each emission block includes multiple emission units; controlling at least one emission block to emit a laser beam according to a preset rule; and controlling a receiving block in the laser receiving array that corresponds to the at least one emission block to receive a laser echo, where the laser echo refers to an echo formed after the laser beam is reflected by a target object.