LiDAR Illumination Offset for Road Debris Detection
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Solution Overview
Problem
Conventional sensors such as cameras, radar, and LiDAR struggle to detect small road obstacles like tires and debris at highway speeds due to poor reflectivity and ground clutter noise, which can lead to vehicle damage or accidents.
Innovation Solution
A LiDAR system with a dedicated illumination module and detection module, where the illumination module transmits light at a glancing angle to enhance the signal from obstacles while minimizing ground clutter, using targeted scan patterns and customized laser illumination profiles, and the detection module is offset from the illumination module to improve signal strength and reduce extraneous information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional LiDAR sensors are used for road obstacle detection, then the system can detect objects at a distance, but the detection precision deteriorates due to ground clutter noise and poor reflectivity of obstacles
Solution Approach 1:
The system divides the illumination function into multiple separate illumination modules positioned at different locations and orientations, each illuminating specific regions of the road surface. This segmentation allows targeted illumination of potential obstacle areas while avoiding illumination of ground clutter regions, thereby improving detection precision and reducing noise.
Solution Approach 2:
Each illumination module is configured with specific illumination characteristics (beam angle, intensity, orientation) optimized for illuminating particular regions of interest on the road surface. This local quality approach ensures that only relevant areas are illuminated, enhancing the signal from obstacles while minimizing ground clutter noise in the detection region.
2Strength
If the detection module is positioned close to the illumination module, then the system structure is compact, but the signal strength from obstacles deteriorates due to increased ground clutter and extraneous information
Solution Approach 1:
The detection module is extracted from the illumination module and positioned separately at an offset location. This separation allows the detection module to be positioned in a location with minimal ground clutter and extraneous information, thereby improving signal strength from obstacles while maintaining a manageable system structure through modular design.
3Area of stationary object
If the illumination module uses broad beam coverage, then the field of view is wide, but the signal-to-clutter ratio deteriorates due to illumination of unnecessary areas
Solution Approach 1:
Instead of using a single broad beam illumination module, the system employs multiple illumination modules each with narrower, more targeted beam coverage. This segmentation of illumination coverage allows the system to maintain comprehensive monitoring of the road while improving the signal-to-clutter ratio by avoiding illumination of unnecessary areas.
Solution Approach 2:
Each illumination module is configured with specific beam characteristics optimized for illuminating particular regions of interest on the road surface. This local quality approach ensures that only relevant areas are illuminated, enhancing the signal from obstacles while minimizing ground clutter noise in the detection region.
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 detects road debris and obstacles up to 200-300 meters in front of a vehicle, enhancing signal strength and reducing clutter, thereby improving safety by allowing for timely vehicle maneuvering or stopping.
Implementation Method 1
the illumination module comprises a light source arranged to transmit light toward the ground a predetermined distance in front of the vehicle
Implementation Method 2
A LiDAR system with a dedicated illumination module and detection module, where the illumination module transmits light at a glancing angle to enhance the signal from obstacles while minimizing ground clutter
Implementation Method 3
A LiDAR sensor can measure the time it takes for each laser pulse to travel from the LiDAR sensor to an object within the sensor's field of view, then reflect off the object and return to the LiDAR sensor
Implementation Method 4
the detection module is arranged to detect light from the light source after light from the light source is transmitted in front of the vehicle
Implementation Method 5
The LiDAR sensor can measure the time it takes for each laser pulse to travel from the LiDAR sensor to an object within the sensor's field of view, then reflect off the object and return to the LiDAR sensor. The LiDAR sensor can calculate a distance how far away the object is from the LiDAR sensor based on the time of flight of the laser pulse
Data Source
AI summary
A system for detecting road debris using LiDAR includes an illumination module and a detection module. The illumination module and the detection module are arranged on a vehicle. The illumination module in contained in a first housing, and the detection module is contained in a second housing. The first housing is separated from the second housing so that the detection module is offset from the illumination module.