Automotive Radar SAR Localization Accuracy
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Solution Overview
Problem
Current positioning systems for autonomous vehicles have errors of up to several meters, which is not sufficient for safe autonomous driving, requiring more accurate location estimation within the environment.
Innovation Solution
A method utilizing synthetic aperture radar (SAR) measurements compared to digital map representations to refine vehicle location estimates, with a training stage to create database entries and a localization stage for accurate matching, enabling precise vehicle navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current positioning systems are used for autonomous vehicles, then the system is simple and easy to operate, but the location accuracy is poor with errors of up to several meters
Solution Approach 1:
The patent combines multiple positioning approaches by integrating SAR measurements with digital map representations. The system merges synthetic aperture radar data with pre-stored map information to achieve high-precision location estimation, resolving the contradiction between accuracy and complexity through data fusion rather than relying on a single complex system
Solution Approach 2:
The patent replaces traditional mechanical positioning systems with radar-based electromagnetic wave measurement. By using SAR technology that emits and receives electromagnetic waves to create high-resolution images of the environment, the system achieves meter-level or centimeter-level accuracy without relying on complex mechanical positioning infrastructure
2Measurement precision
If SAR measurements are used to achieve high location accuracy, then the measurement precision improves to less than 10 centimeters, but the device complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-storing digital map representations in a database before the vehicle reaches the measurement location. This allows the system to quickly compare real-time SAR measurements against pre-prepared reference data, reducing the complexity of real-time processing while maintaining high measurement precision
Solution Approach 2:
The patent uses copying by creating digital representations of the physical environment from SAR measurements and storing them in a database. These digital copies can be efficiently compared with new measurements to determine vehicle location, simplifying the measurement process while achieving centimeter-level accuracy
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
Achieves location accuracy of less than 10 centimeters, allowing for safe and precise autonomous vehicle navigation through environments.
Implementation Method 1
a radar system, a processor and an autonomous driving system. The radar system obtains a synthetic aperture radar (SAR) measurement of a static object in an environment of the vehicle
Implementation Method 2
obtains a synthetic aperture radar (SAR) measurement of a static object in the environment
Data Source
AI summary
A vehicle, driving system and method for driving a vehicle is disclosed. The driving system includes a radar system, a processor and an autonomous driving system. The radar system obtains an SAR measurement of a static object in an environment of the vehicle. The processor obtains a first estimate of a location of the vehicle in the environment, obtains from a database a representation of a static object in the environment associated with the first estimate of the location, and compares the SAR measurement of the static object to the representation of the static object from the database to obtain a second estimate of the location of the vehicle. The autonomous driving system drives the vehicle through the environment based on the second estimate of the location of the vehicle.