Vehicle Radar Lane Detection Using Reflection Intensity
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Solution Overview
Problem
Current vehicle sensors, particularly image sensors, face challenges in accurately detecting lanes at night or in rainy conditions, and have low reliability in measuring azimuth and elevation angles, leading to inaccurate lane detection.
Innovation Solution
A radar device equipped with a radar sensor and control unit that determines targets as objects, roads, or lanes based on the intensity of reflected electromagnetic waves, using reference values to differentiate between them, and integrates with image sensors and illuminance/rain sensors to adapt to day or night conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an image sensor is used to detect lanes, then the system can capture visual information, but the lane detection accuracy deteriorates in adverse weather conditions such as night or rain
Solution Approach 1:
The patent combines radar sensor and image sensor into a unified detection system. The radar sensor detects electromagnetic wave reflections from the road surface and lane markings, while the image sensor captures visual information. By merging the detection results of both sensors, the system achieves reliable lane detection in adverse weather conditions where the image sensor alone would fail.
Solution Approach 2:
The patent introduces an electromagnetic wave absorbing paint as an intermediary element applied to lane markings. This paint enhances the reflection characteristics of lane markings for radar detection, creating a distinct electromagnetic wave reflection pattern that allows the radar sensor to reliably distinguish lane markings from the road surface even in adverse weather conditions.
2Measurement precision
If an image sensor is used to measure azimuth and elevation angles, then the system can obtain angular information, but the measurement precision deteriorates
Solution Approach 1:
The patent replaces the image sensor's optical-based angle measurement with a radar sensor's electromagnetic wave-based detection system. The radar sensor measures azimuth and elevation angles by detecting the direction of reflected electromagnetic waves from the road surface and lane markings, providing more precise angular information for lane detection.
3Measurement precision
If radar signals are used to distinguish road and lane markings, then the lane detection accuracy improves, but the device complexity increases
Solution Approach 1:
The patent designs the radar sensor to perform multiple functions: detecting the road surface, detecting lane markings, and measuring azimuth and elevation angles. By making the radar sensor multi-functional, the system achieves high lane detection accuracy without proportionally increasing device complexity, as one sensor handles multiple detection tasks.
Solution Approach 2:
The patent changes the detection parameters by using electromagnetic wave reflection characteristics at different intensities to distinguish between road surface and lane markings. The radar control unit analyzes the intensity of reflected electromagnetic waves to identify lane markings, providing a simple yet effective method to improve detection accuracy without adding complex processing systems.
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
Enhances lane detection accuracy by utilizing radar signals to distinguish between road and lane markings, even in adverse weather or low light conditions, improving vehicle safety features like adaptive cruise control and autonomous driving functions.
Implementation Method 1
a radar sensor disposed on either one or both of a front surface of a vehicle and a rear surface of the vehicle, and configured to emit an electromagnetic wave signal toward a road having a lane at least partially containing an electromagnetic wave absorbing paint
Implementation Method 2
electromagnetic wave absorbing paint
Data Source
AI summary
A radar device for a vehicle includes: a radar sensor disposed on either one or both of a front surface of a vehicle and a rear surface of the vehicle, and configured to emit an electromagnetic wave signal toward a road having a lane at least partially containing an electromagnetic wave absorbing paint; and a radar control unit configured to determine whether a target is an object, the road, or the lane, based on an intensity of an electromagnetic wave reflected by the object, the road, or the lane, by using a radar signal received from the radar sensor.