Multi-Wavelength Laser Radar Ground Detection
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Solution Overview
Problem
Existing self-driving technologies face challenges in accurately detecting complex ground environments, such as uneven road surfaces, grass, water, incomplete road lines, and shadows, using single-wavelength laser radar or image recognition methods, which are ineffective at night or in complex scenarios.
Innovation Solution
A method and apparatus utilizing multi-wavelength laser radar to scan the ground environment, determining ground environment types based on reflection intensity features, and partitioning the environment into sub-regions with different laser reflection features, enhanced by neural networks for improved accuracy and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-wavelength laser radar or image recognition is used, then device complexity is reduced, but detection precision deteriorates in complex ground environments
Solution Approach 1:
The patent changes the parameter of laser wavelength from single to multiple wavelengths. By using laser radars with different operating wavelengths (e.g., 905nm, 1550nm) to scan the ground environment, the system captures different reflection intensity features from the same ground surface. This parameter change enables the system to distinguish complex ground environments (grass, water, uneven surfaces) that cannot be detected by single-wavelength methods, thereby improving detection accuracy without requiring complex image processing systems.
2Measurement precision
If multi-wavelength laser radar is used, then detection precision improves in complex environments, but device complexity increases
Solution Approach 1:
The patent makes the laser radar system multi-functional by equipping it with multiple operating wavelengths. The same laser radar hardware platform can operate at different wavelengths, allowing a single device to handle various ground environment detection tasks. This universality reduces the need for multiple specialized devices while maintaining high detection accuracy across different scenarios (highway, grass, water, night conditions).
Solution Approach 2:
The system changes the operational parameter (wavelength) of the laser radar to adapt to different detection needs. By switching between different wavelengths, the system can optimize detection performance for specific ground conditions without requiring physically different sensor systems, thereby managing complexity while improving precision.
3Adaptability or versatility
If image recognition is used, then adaptability to visual features improves, but reliability deteriorates at night or in poor lighting conditions
Solution Approach 1:
The patent replaces the optical/image-based detection system with a laser-based active illumination system. Instead of relying on passive light reflection captured by cameras (which fails at night), the laser radar actively emits laser pulses and measures the reflected light. This substitution of detection mechanism ensures reliable operation in all lighting conditions, including complete darkness, while maintaining adaptability to different ground surfaces through wavelength variation.
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 significantly enhances the perception of complex ground environments, accurately determining passable road surfaces by using multi-wavelength laser radar to analyze reflection intensity and features, improving detection accuracy and robustness in various conditions.
Implementation Method 1
laser radar based on different operating wavelengths is used to scan the ground
Implementation Method 2
receiving a reflected signal that is reflected back by the ground environment for the sounding signal
Data Source
AI summary
A ground environment detection method and apparatus are disclosed, where the method includes: scanning a ground environment by using laser sounding signals having different operating wavelengths, receiving a reflected signal that is reflected back by the ground environment, determining scanning spot information of each scanning spot of the ground environment based on the reflected signal, determining space coordinate information and a laser reflection feature of each scanning spot based on each piece of scanning spot information, partitioning the ground environment into sub-regions having different laser reflection features, and determining a ground environment type of each sub-region. Lasers having different operating wavelengths are used to scan the ground, and the ground environment type is determined based on the reflection intensity of the ground environment under different wavelengths of lasers, thereby improving a perception effect of a complex ground environment, and better determining a passable road surface.