LiDAR Light Spot Timing for High-Reflectivity Crosstalk
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Solution Overview
Problem
Lidar systems face challenges with crosstalk issues in high-reflectivity areas, leading to inaccurate target detection and increased implementation difficulty and costs due to existing methods like additional detectors or channel coding.
Innovation Solution
The method involves determining a first light spot based on the position of a high-reflectivity area, staggering lighting times for adjacent areas, and adjusting lighting policies to emit light spots that reduce crosstalk, allowing for accurate target identification with reduced hardware and design costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional receiving detectors are disposed to measure crosstalk points, then crosstalk filtering capability is improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent uses channel coding to create redundant information copies that enable crosstalk identification without additional hardware detectors. The encoded channels carry information that allows the system to distinguish between valid signals and crosstalk interference through software processing rather than hardware addition.
Solution Approach 2:
The patent replaces the mechanical approach of adding physical detectors with a signal processing approach using channel coding. Instead of measuring crosstalk points with additional hardware, the system uses encoded channel information to identify and filter crosstalk through computational methods.
2Object-affected harmful factors
If isolation between channels of the lidar is improved, then crosstalk is reduced, but device complexity and design costs increase
Solution Approach 1:
The patent changes the parameter of channel identification from physical isolation to coding-based identification. By assigning unique codes to different channels, the system can distinguish between channels through signal characteristics rather than requiring physical isolation barriers, thereby reducing design complexity and costs.
Solution Approach 2:
The patent uses channel coding to create information copies that enable channel identification without physical isolation. The encoded information allows the system to recognize and separate signals from different channels through software processing rather than hardware isolation structures.
3Measurement precision
If channel coding is used to identify crosstalk noise, then crosstalk filtering is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the channel coding itself provides the means for crosstalk identification. The encoded information in the channels serves dual purposes: transmitting data and enabling crosstalk detection, eliminating the need for separate detection mechanisms and reducing overall system complexity.
4Object-affected harmful factors
If traditional crosstalk filtering methods are used, then crosstalk is reduced, but implementation difficulty and design costs increase
Solution Approach 1:
The patent makes the channel coding system multi-functional by having it simultaneously perform data transmission and crosstalk identification. This universal approach eliminates the need for separate crosstalk filtering hardware or processes, thereby simplifying manufacturing and implementation while maintaining effective crosstalk reduction.
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 enhances target detection accuracy in high-reflectivity areas by minimizing crosstalk, simplifying implementation, and reducing costs compared to traditional methods.
Implementation Method 1
a transmitting module configured to emit the first light spot
Implementation Method 2
receiving an echo reflected by the target
Data Source
AI summary
A lidar determines a first light spot, where a position of the first light spot is determined based on a position of a high-reflectivity area; and emits the first light spot, where the first light spot includes a first area and a second area, the first area is a lighting area, the first area is located on a first straight line, the first straight line overlaps the high-reflectivity area, and the first area is located outside the high-reflectivity area; and the second area is a non-lighting area, the second area is located on the first straight line, and the second area overlaps the high-reflectivity area; or the second area is a lighting area, the second area is located on a second straight line, the second straight line overlaps the high-reflectivity area.