UWB Ranging Verification Using Time-of-Flight Consistency Checks
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Solution Overview
Problem
Current UWB ranging technologies are susceptible to frequency manipulation attacks, leading to significant ranging errors, and existing methods lack effective verification mechanisms to detect such attacks.
Innovation Solution
A method involving a sequence of message exchanges between UWB ranging devices to estimate time-of-flight values and perform multiple consistency checks based on predetermined parameters, including relative frequency factors and carrier frequency offsets, to verify the integrity of ranging results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external XTAL is used for high frequency precision in RF operation and Time-of-Flight measurement, then measurement precision is improved, but the system becomes susceptible to frequency manipulation attacks
Solution Approach 1:
The patent measures the actual frequency of the external XTAL before performing the Time-of-Flight measurement using the formula ToF = (T2 - T1) * f_actual / f_nominal. This preliminary frequency measurement and correction action prevents ranging errors caused by frequency drift or manipulation, resolving the contradiction between using external XTAL for precision and maintaining security against manipulation attacks.
2Reliability
If frequency manipulation detection mechanisms are added to verify ranging results, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent uses feedback from the measured actual frequency to correct the Time-of-Flight calculation. By continuously monitoring the XTAL frequency and adjusting the ranging calculation accordingly, the system detects frequency manipulations without requiring complex additional verification hardware, thus improving reliability while minimizing device complexity.
Solution Approach 2:
The system uses its own frequency measurement capabilities to self-verify the integrity of its ranging measurements. By measuring its own XTAL frequency and using this information to correct potential manipulation errors, the system achieves reliable attack detection without external verification infrastructure.
3Reliability
If multiple consistency checks based on predetermined parameters are performed, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent performs frequency measurements and prepares correction factors before the actual ranging measurement. By having the actual frequency value ready in advance, the system can quickly correct the ToF calculation without performing complex real-time analysis, thus improving verification reliability while minimizing time loss.
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 proposed method effectively detects and prevents frequency manipulation attacks, ensuring accurate and secure UWB ranging by validating that estimated time-of-flight values and frequency ratios fall within predetermined ranges, thereby maintaining the reliability of distance measurements.
Implementation Method 1
estimating a time-of-flight value based on the round times and response times
Data Source
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Figure 3
Figure 4A~4B
AI summary
There is described a method of verifying a time-of-flight based ranging result in a UWB ranging device, the method comprising: exchanging a sequence of messages between the UWB ranging device and a further UWB ranging device as part of a double-sided ranging process to obtain round times and response times at both the UWB ranging device and the further UWB ranging device; estimating a time-of-flight value based on the round times and response times; and verifying the ranging result by performing a consistency check based on the estimated time-of-flight value and one or more predetermined parameter values. Furthermore, a UWB ranging device and a UWB ranging system are described.