Corner Cube Radar Reflector for Detecting Cyclists and Pedestrians
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Solution Overview
Problem
Current collision avoidance systems in vehicles, particularly those using radar sensors, struggle to detect small aspect ratio targets like cyclists and pedestrians due to directional sensitivity and signal strength limitations, leading to a high number of fatalities and injuries annually.
Innovation Solution
A reflective sensor device utilizing a novel corner cube reflector design and configuration is integrated into various mounting schemes, such as bike frames or human extremities, to significantly increase the Radar Cross Section (RCS) and Doppler signature of small targets, enhancing their detectability by vehicle radar systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar sensors are used for collision avoidance detection, then detection capability is improved, but detection of small aspect ratio targets at off-angles and wide fields-of-view deteriorates due to directional sensitivity and signal strength limitations
Solution Approach 1:
The patent introduces passive radar reflectors as intermediary devices that attach to small targets (cyclists, pedestrians, animals). These reflectors act as mediators between the target and the radar sensor, significantly amplifying the radar cross-section of small targets by factors of 10-100x, making them detectable by standard automotive radar systems at much greater distances and from wider angles
Solution Approach 2:
The patent changes the radar cross-section parameter of small targets by attaching passive reflectors. The reflectors are designed with specific geometries (corner cubes, parabolic shapes) that reflect radar signals back to the source, transforming the effective radar signature of small targets from undetectable levels to detectable levels without requiring active transmitters on the targets
2Reliability
If collision avoidance systems are made standard equipment, then vehicle safety is improved, but the high cost of fatalities and injuries to cyclists and pedestrians persists due to inability to detect small targets
Solution Approach 1:
The passive reflectors serve as intermediaries that enable standard collision avoidance systems to detect previously undetectable targets. By attaching these reflectors to cyclists, pedestrians, and animals, the system extends the detection capability of standard radar to cover small aspect ratio targets, directly addressing the harmful factor of undetected vulnerable road users
Solution Approach 2:
The patent converts the harmful factor of small target invisibility into a benefit by using passive, low-cost reflectors that can be attached to vulnerable road users. This transforms the problem of undetectable targets into a detectable system, where the reflectors themselves become the solution, enabling standard vehicles to detect and avoid cyclists, pedestrians, and animals
3Length of stationary object
If radar signal strength is increased to detect small targets, then detection range is improved, but energy consumption and system complexity increase
Solution Approach 1:
Instead of increasing radar transmitter power, the patent uses passive reflectors as intermediaries that actively return radar signals to the source. This approach achieves extended detection range without increasing the energy consumption of the radar system, as the reflectors passively amplify the signal using their geometric structure rather than active power amplification
Solution Approach 2:
The passive reflectors are self-powered devices that use the incident radar signal itself to generate the reflected signal. They require no external power source, batteries, or active electronics, making them energy-free solutions that extend detection range without imposing any energy burden on the radar system or the attached target
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 solution significantly increases the likelihood of detecting small targets at multiple angles and distances, enabling earlier warnings and improved collision avoidance capabilities, while being cost-effective and adaptable to various objects and mounting configurations.
Implementation Method 1
A reflective sensor device utilizing a novel corner cube reflector design and configuration is integrated into various mounting schemes... to significantly increase the Radar Cross Section (RCS)... of small targets, enhancing their detectability by vehicle radar systems
Implementation Method 2
each apparatus can significantly increase the Radar Cross Section (RCS) measurement and Doppler and Micro-doppler signature of the target object
Data Source
AI summary
A reflective device includes a novel corner cube reflector design and application, with unique and specific configurations and geometries of singular or multiple corner reflectors. The device can significantly increase the Radar Cross Section (RCS) measurement of the target object (e.g. cyclist and pedestrians) and greatly amplify the presence of the target object at multiple angles, orientations, distances and ranges to the vehicles collision avoidance radar system.