UWB and Radar Distance Correlation for Relay Attack Detection
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Solution Overview
Problem
Existing radio signal-based distance determination methods are vulnerable to unauthorized access attempts, such as relay and physical layer attacks, which can manipulate distance measurements.
Innovation Solution
Integrate a radar device with a radio device to perform time-resolved distance and angle measurements, comparing UWB-ToF and radar measurements for consistency to detect potential attacks, allowing software updates without hardware changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UWB radio signals are used for distance determination and access control, then convenient contactless access is enabled, but the system becomes vulnerable to relay attacks and physical layer attacks
Solution Approach 1:
The patent combines UWB radio distance determination with radar-based distance sensing in a hybrid system. The UWB radio device determines distance through time-of-flight measurements while the radar device independently measures distance through signal reflections. Both measurement systems operate simultaneously and their results are cross-validated to detect attacks, merging two different sensing modalities into a unified security system that maintains convenience while enhancing reliability
Solution Approach 2:
The system implements feedback by continuously monitoring and comparing distance measurements from both UWB and radar systems. When inconsistencies are detected between the two independent measurement methods, the system triggers security responses such as denying access or alerting authorities. This closed-loop feedback mechanism enables real-time detection of relay attacks and physical layer attacks while maintaining normal operation during legitimate access attempts
2Reliability
If a radar device is integrated with the radio device for enhanced security, then attack detection capability is improved, but device complexity increases
Solution Approach 1:
The radio device is designed with multi-functionality, serving both as a UWB communication device for distance determination and as a radar sensing device for attack detection. The same hardware components (antenna, transceiver, processor) are utilized for both standard UWB ranging operations and radar-based security monitoring. This universal design allows the system to perform multiple functions without proportionally increasing hardware complexity, as the existing radio infrastructure is leveraged for dual purposes
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 security by detecting inconsistencies in distance and angle measurements, effectively preventing unauthorized access attempts through temporal correlation analysis.
Implementation Method 1
distance determination based on time of flight (ToF)
Implementation Method 2
radar-based use of the radio device (also referred to as UWB-sensing), only this device sends a radio signal and detects reflections of the radio signal at surrounding objects
Data Source
AI summary
A device including a first radio device, which is designed to exchange radio signals with a second radio device which is spaced apart from the first radio device, for the time-resolved determination of a first distance and/or an angle of incidence between the first radio device and the second radio device; a radar device which is designed to detect objects in an environment of the device and for the time-resolved determination of a second distance to the second radio device and/or an angle between the device and the second radio device; and a processor which is designed to determine whether the determined first distance is temporally correlated with the second distance and/or whether the angle of incidence is temporally correlated with the angle between the device and the second radio device.