Vehicle Radar Logo Layer Assembly for Reflected-Wave Cancellation
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Solution Overview
Problem
Radar sensors in vehicle assemblies experience reduced signal-to-noise ratio and detection range due to first-order reflected waves generated by the interaction of emitted radar waves with the arrangement of layers, leading to detection errors or missed object detection.
Innovation Solution
The vehicle assembly incorporates a specific arrangement of layers with a first subset performing optical functions and a second subset providing protection, where the total thickness of the second subset is dimensioned to equal m times the wavelength divided by twice the equivalent refractive index of both subsets, times the cosine of the angle of incidence, ensuring destructive interference of reflected waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an arrangement of layers is disposed facing the radar sensor to form an illuminated logo, then the aesthetic and branding function is improved, but first-order reflected waves are generated that reduce the signal-to-noise ratio and detection range
Solution Approach 1:
The patent converts the harmful reflected waves into a beneficial effect by designing the layer arrangement to generate destructive interference. The reflected waves from different layer interfaces are made to cancel each other out through careful control of layer thicknesses and refractive indices, transforming the harmful reflection into a noise-reducing mechanism that actually improves radar detection.
Solution Approach 2:
The patent changes the physical parameters of the layer arrangement, specifically the thickness of each layer and the refractive index differences between adjacent layers. By optimizing these parameters according to the formula provided in the patent, the system achieves destructive interference of reflected waves while maintaining the logo's optical functionality.
2Illumination intensity
If the arrangement of layers is made thicker to improve optical functionality, then the logo appearance is improved, but the reflection interference increases and detection range is reduced
Solution Approach 1:
The patent precisely controls the thickness parameters of individual layers rather than simply increasing overall thickness. By optimizing each layer's thickness according to the wavelength of radar waves and refractive index differences, the system achieves the desired optical appearance while minimizing reflection interference through destructive interference mechanisms.
3Illumination intensity
If the arrangement of layers uses high refractive index materials to improve optical contrast, then the logo visibility is improved, but the reflection intensity increases causing more noise
Solution Approach 1:
The patent utilizes the refractive index differences that cause strong reflections and converts this harmful effect into a beneficial one. By designing multiple interfaces with alternating refractive index differences, the system creates multiple reflected waves that interfere destructively, transforming the high reflection intensity into a noise-cancellation mechanism.
Solution Approach 2:
The patent employs a composite layer structure with alternating materials of different refractive indices. This composite arrangement creates multiple reflection interfaces where the reflected waves from each interface can interfere destructively with waves from other interfaces, reducing overall reflection noise while maintaining optical contrast for logo visibility.
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 configuration enhances the signal-to-noise ratio and reduces noise interference, improving radar wave emission and detection accuracy by canceling out first-order reflected waves, thereby maintaining optimal detection performance.
Implementation Method 1
when a radar wave is emitted by the radar sensor, it travels to the arrangement of layers and reflects on the arrangement of layers. This generates two reflected waves, one of which has been reflected on the outer face of the arrangement of layers and the other one of which has been reflected inside the arrangement of layers.
Implementation Method 2
the total thickness of the second subset of layers is dimensioned so that the total thickness of the arrangement of layers is equal to m times a wavelength of said range divided by twice the equivalent refractive index of the first subset of layers and of the second subset of layers, times the cosine of a refracted angle corresponding to the angle of incidence of the radar waves
Data Source
AI summary
A vehicle assembly including a radar sensor configured to emit radar waves over a range of wavelengths with an arrangement of layers placed opposite the radar sensor, including a first subset of layers configured to perform an optical function, each layer having a refractive index and a thickness, and a second subset of layers configured to provide protection for the first set of layers, each layer having a refractive index and a thickness. The total thickness of the second subset of layers is dimensioned so that the total thickness of the arrangement of layers is equal to m times a wavelength of the range divided by twice the equivalent refractive index of the first subset of layers and of the second subset of layers, times the cosine of a refracted angle corresponding to the angle of incidence of the radar waves, where m is an integer.