Radar Side-Shield Structure for False Target Diffusion
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Solution Overview
Problem
Radar transceivers in vehicles often suffer from false target detections due to reflections from vehicle body parts, leading to increased noise floor and clutter, and there is a need to reduce system cost.
Innovation Solution
A side-shield with a non-uniform delay structure is used to randomize the phase distribution of radar signals, diffusing and steering them to alleviate false detections and reduce cost through cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radar transceiver is hidden behind vehicle body parts for aesthetic reasons and protection, then the aesthetic appearance and mechanical protection are improved, but false target detections increase due to radar signal reflections from the body parts
Solution Approach 1:
A side-shield component is introduced as an intermediary element between the radar transceiver and the vehicle body part. This side-shield includes a non-uniform delay structure that randomizes the phase distribution of reflected radar signals, preventing them from forming coherent false targets while allowing the radar transceiver to remain hidden behind the body part for aesthetic and protective purposes.
2Reliability
If a conventional side-shield is used to protect the radar transceiver, then mechanical protection is improved, but false detections persist due to uniform phase reflections
Solution Approach 1:
The side-shield is designed with a non-uniform delay structure where different regions have different delay characteristics. This creates local variations in phase distribution across the reflected radar signals, ensuring that reflections from different parts of the side-shield do not coherently combine to form false targets, while maintaining uniform mechanical protection across the entire side-shield structure.
3Measurement precision
If complex anti-reflection structures are implemented to reduce false detections, then measurement precision is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The side-shield utilizes a non-uniform delay structure that can be implemented by varying geometric parameters (such as thickness, shape, or material properties) across the side-shield surface. This approach achieves phase randomization of reflected signals through parameter variation rather than through complex multi-component structures, thereby reducing overall device complexity while maintaining effectiveness in reducing false detections.
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 side-shield effectively reduces false detections and clutter by diffusing radar signals, improving radar performance while being cost-effective to produce.
Implementation Method 1
a non-uniform delay structure arranged over the side-shield, the non-uniform delay structure being configured to delay a radar signal propagating through the side-shield by a variable amount in dependence of a wavelength of the radar signal and in dependence of a location on the side-shield surface through which the radar signal propagates, thereby steering and/or diffusing the radar signal after propagation through the side-shield
Implementation Method 2
steering and/or diffusing the radar signal after propagation through the side-shield
Implementation Method 3
The angled surface of the second component comprises a texture such that when the portion of the radiation impinges on the angled surface, the amount of multipath signal propagating through the radiation aperture of the antenna element is reduced
Implementation Method 4
The cover is formed of a dielectric material for covering the antenna with a wall and a ceiling, and strengthens the directivity of radio wave communication on the wall side of the antenna device by a double layer structure of the ceiling that is thicker than the wall
Data Source
Figure 1~2
Figure 3~4
Figure 5A~7
AI summary
A side-shield (310) for a radar transceiver (130), the side-shield (310) comprising a non-uniform delay structure arranged over an extension plane of the side-shield, the non-uniform delay structure being configured to delay a radar signal (220, 320) propagating through the side-shield (310) by a variable amount in dependence of a wavelength of the radar signal and in dependence of a location on the extension plane, thereby steering and/or diffusing the radar signal (320) after propagation through the side-shield (310).