Headlamp LiDAR-Radar Beam Alignment for Compact Vehicle Sensing
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Solution Overview
Problem
Current vehicle headlight systems face challenges in integrating radar and LiDAR technologies due to space constraints, material attenuation, and signal interference, which affects the accuracy and reliability of distance and angle measurements for driver assistance systems.
Innovation Solution
A multispectral emission device that integrates LiDAR and radar sensors within the headlamp, using radiation manipulators to align and overlap LiDAR and radar radiation cones, allowing for coaxial or parallel beam guidance to enhance detection capabilities and reduce parallax errors, while also incorporating a light-transparent headlamp cover for optimal signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If radar and LiDAR sensors are integrated within the headlamp, then space requirements are reduced and device compactness is improved, but signal interference and material attenuation affect measurement precision
Solution Approach 1:
The patent divides the integrated sensor system into separate functional modules: a light source unit for visible illumination, a LiDAR transmitting unit for laser radiation, and a radar antenna unit for radio waves. Each module has its own dedicated receiver unit and radiation manipulator, allowing independent optimization of each sensor type while maintaining compact integration within the headlamp housing.
Solution Approach 2:
The patent introduces radiation manipulators as intermediary components between the sensors and the external environment. These manipulators include frequency-selective surfaces and beam deflectors that mediate the interaction between different radiation types and the headlamp cover, enabling precise control over which wavelengths are transmitted or reflected to each receiver while minimizing mutual interference.
2Reliability
If radar technology is integrated in the bumper, then protection and integration are improved, but the risk of damage increases especially in minor impacts
Solution Approach 1:
The patent merges the radar sensor housing with the headlamp assembly, creating a unified structural unit. The headlamp housing serves dual purposes: as a protective enclosure for the light sources and as a protective housing for the radar antenna and electronics. This integration eliminates the need for separate radar housings that would be vulnerable to impact damage.
3Adaptability or versatility
If radar components are integrated into the radiator grille, then vehicle design flexibility is improved, but compromises in vehicle design are required
Solution Approach 1:
The patent designs the headlamp assembly as a universal platform that simultaneously serves multiple functions: visible light illumination for nighttime driving, LiDAR for precise distance measurement, and radar for velocity and distance detection. This multi-functional integration eliminates the need for separate detector components and simplifies vehicle design by consolidating all sensing functions into a single standardized assembly.
4Measurement precision
If LiDAR and radar radiation cones are aligned coaxially or in parallel, then detection accuracy is improved and parallax errors are reduced, but device complexity increases due to additional radiation manipulators
Solution Approach 1:
Instead of trying to align the sensors physically in a complex three-dimensional arrangement, the patent inverts the approach by using planar radiation manipulators to deflect the radiation paths. The sensors can remain in a simple planar configuration, and the manipulators perform the alignment function by reflecting or refracting the radiation cones into coaxial or parallel orientations, thereby achieving precise alignment without complex sensor positioning.
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 solution enables more compact and reliable integration of LiDAR and radar technologies, improving the detection of objects and movement components, and combining wavelengths over several orders of magnitude for enhanced all-weather suitability and precise distance and speed measurements.
Implementation Method 1
the radiation manipulator for LiDAR radiation redirects LiDAR radiation emitted by the transmitting unit for LiDAR radiation such that at least one radiation cone for redirected LiDAR radiation extends parallel and coaxially to a light cone emitted by the light source
Implementation Method 2
a radar module with a radar antenna unit arranged behind the headlamp cover and integrated in the headlamp
Implementation Method 3
a light-transparent headlamp cover
Implementation Method 4
LiDAR radiation passing through the headlight cover from the outside is guided to the receiver unit for LiDAR radiation
Implementation Method 5
set up for detecting at least reflected radar radiation
Data Source
AI summary
A multispectral emission device includes at least one transmitting unit for LiDAR radiation, one receiving unit for LiDAR radiation, and at least a LiDAR radiation manipulating device, and a radar radiation manipulating device. The LiDAR radiation manipulating device and the transmitting unit for LiDAR-S are arranged such that the LiDAR radiation manipulating device redirects LiDAR radiation emitted by the transmitting unit for LiDAR radiation and the LiDAR radiation manipulating device is set up such that LiDAR radiation passing through the headlight cover from the outside is guided to the receiving unit for LiDAR radiation. The radar radiation manipulating device is set up such that radar radiation passing through the headlight cover from the outside is guided to the receiving unit for radar radiation. The transmitting unit for LiDAR radiation, the LiDAR radiation manipulating device, the radar module, and the radar radiation manipulating device are arranged such that at least one radiation cone of diverted LiDAR radiation and at least one radiation cone of diverted radar radiation are aligned.