Radar-Optical Retroreflective Article for Micromobility Detection
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Solution Overview
Problem
Current driving assistance systems and autonomous driving systems face challenges in distinguishing between micro-mobility devices and pedestrians due to similar radar cross-sections and smaller profiles, leading to erroneous detections and inability to differentiate between micro-mobility devices and pedestrians.
Innovation Solution
A radar-optical fusion article is introduced, featuring a first retroreflective layer for light wavelengths between 400 nm to 2500 nm and a second retroreflective layer for electromagnetic waves between 0.5 GHz to 100 GHz, attached to micro-mobility devices, which enhances detection by providing a unique signature for both optical and radar systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar sensors are used to detect objects, then speed and distance information is provided, but the system cannot differentiate between micro-mobility devices and pedestrians due to similar radar cross-sections
Solution Approach 1:
The patent combines radar retroreflective layers and optical retroreflective layers into a single integrated article. The radar retroreflective layer retroreflects radar signals while the optical retroreflective layer retroreflects visible light, allowing a single article to provide both radar detectability enhancement and optical visibility, thereby enabling better object differentiation without requiring separate components
Solution Approach 2:
The article comprises composite retroreflective materials with different functional layers - a radar retroreflective layer containing conductive particles or structures for radar signal retroreflection, and an optical retroreflective layer containing glass beads or prisms for visible light retroreflection. This composite structure enables simultaneous interaction with both radar and optical detection systems
2Measurement precision
If image sensors are used to identify objects, then spatial images are generated, but the system cannot detect micro-mobility devices with smaller profiles compared to drivers
Solution Approach 1:
The optical retroreflective layer can be designed with specific optical properties including wavelength-selective retroreflection, allowing the article to retroreflect specific wavelengths of light more strongly. This enhances the optical signal strength for image sensors by creating a distinctive visual signature that increases detectability of small-profile objects
Solution Approach 2:
By merging radar retroreflective and optical retroreflective properties into a single article, the system ensures that micro-mobility devices are simultaneously enhanced for radar detection and optical visibility, solving the problem of undetected small-profile objects in image sensors
3Productivity
If driving assistance systems classify objects using radar, then speed and distance are detected, but erroneous classifications occur between micro-mobility devices and pedestrians
Solution Approach 1:
The article provides localized enhancement of retroreflection properties at the position of the micro-mobility device. The radar retroreflective layer creates a strong, localized radar signal return that distinguishes the device from pedestrians who lack this enhancement, thereby improving classification accuracy without affecting overall detection speed
Solution Approach 2:
The invention changes the physical parameters of the detection target by introducing materials with specific electromagnetic properties - conductive particles or structures in the radar retroreflective layer that strongly retroreflect radar signals. This parameter change creates a distinctive radar signature that enables reliable differentiation between micro-mobility devices and pedestrians
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 radar-optical fusion article improves the accuracy of object detection by providing a distinct signature for micro-mobility devices, enabling systems to differentiate between micro-mobility devices and pedestrians, thereby reducing erroneous classifications and enhancing safety in various scenarios.
Implementation Method 1
a first retroreflective layer which is configured to retroreflect at least a portion of light having a wavelength in a range from about 400 nanometer (nm) to about 2500 nm
Implementation Method 2
a second retroreflective layer disposed adjacent to the first retroreflective layer. The second retroreflective layer is configured to retroreflect at least a portion of an electromagnetic wave having a frequency in the range from about 0.5 gigahertz (GHz) to about 100 GHz
Data Source
AI summary
A radar-optical fusion article for attachment to a substrate is described. The radar-optical fusion article includes a first retroreflective layer which is configured to retroreflect at least a portion of light having a wavelength in a range from about 400 nm to about 2500 nm. The radar-optical fusion article includes a second retroreflective layer disposed adjacent to the first retroreflective layer. The second retroreflective layer is configured to retroreflect at least a portion of an electromagnetic wave having a frequency in the range from about 0.5 GHz to about 100 GHz.