LiDAR Driving System Using Segmented Activation Patterns
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Solution Overview
Problem
Conventional LiDAR systems experience cross-talk phenomena due to strong received signals from objects with high reflectance or positioned close to the sensor, leading to image distortion.
Innovation Solution
A LiDAR driving system that controls the driving states of emitters and photodetection elements using activation patterns to prevent adjacent emitters from irradiating light simultaneously, thereby minimizing cross-talk and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all emitters and photodetection elements operate simultaneously to maximize data acquisition speed, then productivity is improved, but cross-talk phenomenon occurs causing image distortion
Solution Approach 1:
The patent divides the 2D array of emitters and photodetection elements into multiple groups that operate sequentially rather than simultaneously. Each group corresponds to a specific activation pattern, where only certain emitters and their corresponding photodetection elements are active at any given time. This segmentation eliminates cross-talk between adjacent elements while maintaining comprehensive coverage through multiple activation patterns.
Solution Approach 2:
The patent employs periodic activation patterns where different groups of emitters and photodetection elements are activated in sequence. Multiple activation patterns are applied periodically to ensure all regions are scanned, achieving both high-speed data acquisition and high measurement precision by eliminating cross-talk through temporal separation of operations.
2Area of stationary object
If adjacent emitters irradiate light simultaneously to cover more area, then area of detection is improved, but cross-talk phenomenon occurs causing noise in acquired data
Solution Approach 1:
The patent segments the emitter array into multiple groups that are activated sequentially according to different activation patterns. Each pattern activates a specific subset of emitters with sufficient spacing between them, preventing cross-talk while ensuring complete area coverage through the combination of multiple patterns.
Solution Approach 2:
The patent uses periodic activation where different emitter groups are activated in sequence across multiple cycles. This ensures that the entire detection area is covered over time while maintaining low cross-talk levels during each individual activation cycle, as adjacent emitters are not simultaneously active.
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
The system effectively reduces noise and distortion in acquired data by minimizing cross-talk, enabling more accurate measurement of object distances and shapes.
Implementation Method 1
measures a distance to an object by measuring a round-trip time of light using a laser
Implementation Method 2
measures a distance to an object by measuring a round-trip time of light using a laser
Implementation Method 3
an optical reception unit including a plurality of photodetection elements arranged in a 2-dimensional matrix structure
Data Source
AI summary
The present invention is a technology related to a light detection and ranging (LiDAR).Specifically, the present invention relates to a technology of resolving a phenomenon in which, when an object has a high reflectance or is positioned close thereto, a signal (received signal) returned by being reflected is strong to cause a cross-talk phenomenon (overlapping phenomenon according to the interference effect between pixels), and thus a distortion occurs in an acquired result based on a basic driving condition of a LiDAR sensor for acquiring a distance to the object, a shape of the object, and the like by collecting a signal that a laser pulse irradiated by an emitter is returned by being reflected from the object (object).


