Vehicle Localization Using Radar Side Barriers
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Solution Overview
Problem
Existing vehicle localization methods, such as camera-based systems, are limited by environmental conditions like weather and lighting, and are computationally intensive, making them unreliable for precise real-time localization.
Innovation Solution
A method using a radar device to emit signals perpendicular to the vehicle's direction, identifying stationary artificial side barriers through consistent radar echoes, and utilizing a high-definition map with artificial side barriers for robust localization, independent of lighting and weather conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If camera-based environment detection is used for vehicle localization, then object recognition capability is improved, but reliability deteriorates under unfavorable environmental conditions such as nighttime, fog, heavy rain, or direct sunlight
Solution Approach 1:
The patent replaces camera-based optical detection with radar-based electromagnetic wave detection. Radar signals can penetrate fog, rain, and darkness, providing reliable detection of artificial side barriers regardless of environmental conditions, thus resolving the contradiction between object recognition capability and localization reliability
Solution Approach 2:
The patent changes the detection parameter from optical reflectivity (camera) to radar signal characteristics (echo intensity, phase, time of flight). By analyzing radar echo parameters from artificial side barriers, the system achieves reliable localization independent of lighting and weather conditions
2Measurement precision
If computer vision algorithms are used for distance determination from camera images, then measurement capability is improved, but device complexity and computational load increase
Solution Approach 1:
The patent replaces complex computer vision processing with simple radar time-of-flight measurement. The distance to artificial side barriers is directly calculated from the time delay of radar echoes, eliminating the need for computationally intensive image processing algorithms while achieving accurate distance determination
Solution Approach 2:
The patent uses simple, computationally inexpensive radar echo analysis instead of expensive, complex computer vision algorithms. The radar-based approach provides sufficient measurement precision with minimal computational resources, making it suitable for real-time implementation
3Ease of manufacture
If conventional maps are used for vehicle localization, then map availability is improved, but measurement precision deteriorates due to lack of detailed reference objects
Solution Approach 1:
The patent pre-loads artificial side barriers into high-definition maps before vehicle operation. These predetermined reference objects are stored in the map data, allowing the radar system to quickly identify and match barriers during traversal, achieving centimeter-level localization precision without requiring complex real-time processing
Solution Approach 2:
The patent creates a detailed digital copy of the physical environment by incorporating artificial side barrier locations and geometries into high-definition maps. This digital twin provides precise reference objects for radar matching, enabling accurate vehicle localization that conventional maps cannot provide
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
Enables accurate, reliable, and robust vehicle localization by leveraging the consistency of radar echoes from immobile artificial side barriers, providing improved precision and reliability compared to camera-based systems.
Implementation Method 1
radar signals are emitted in the transverse direction of the vehicle during a journey using a radar device of the motor vehicle and corresponding or resulting radar echoes are received
Implementation Method 2
those of the received radar echoes are determined which have been reflected perpendicular to the longitudinal direction of the vehicle and/or perpendicular to the current direction of travel of the motor vehicle
Data Source
AI summary
Methods, systems, and apparatuses are provided for localizing a motor vehicle. A map is provided in which artificial side barriers that run laterally along a road are entered; emitting radar signals in a transverse direction of the vehicle during a journey using a radar device of the motor vehicle. Resulting radar echoes are received. The radar echoes which were reflected perpendicular to a longitudinal direction of the vehicle and/or perpendicular to the direction of travel of the motor vehicle are determined that indicate a vanishing relative velocity between the motor vehicle and a respective source from which the radar echo originates. A distance of the motor vehicle from the respective source is determined based on the radar echoes. The source of the radar echoes is identified as an artificial side barrier. Based on the identified source, a current position of the motor vehicle is determined in the map.