UWB Two-Way Ranging CIR Validation for False Peak Security
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Solution Overview
Problem
Current UWB two-way ranging systems face security challenges as existing measures are insufficient to prevent attackers from inducing false early peaks in the channel impulse response, compromising the accuracy of time-of-flight measurements.
Innovation Solution
A method and device for validating channel impulse responses by comparing the similarity of CIRs generated by two UWB devices, using techniques such as peak separation, strength ratio, contour comparison, and cross-correlation, to ensure the integrity of time-of-flight calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional UWB TWR systems use basic timestamp validation, then the system operation is simple, but the security against false early peak induction is insufficient
Solution Approach 1:
The patent applies preliminary action by performing CIR validation before final TOF calculation. The receiving device compares the received CIR with a locally generated reference CIR to detect potential attacks beforehand, ensuring that only valid CIR data is used for distance calculation, thus preventing false early peak induction.
Solution Approach 2:
The patent introduces CIR comparison as an intermediary validation step between timestamp exchange and final TOF calculation. By using reference CIR generated from known pseudorandom sequences as a mediator, the system can detect anomalies in the received CIR without directly trusting the raw measurements, thereby enhancing security.
2Measurement precision
If UWB devices perform comprehensive CIR validation, then measurement accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts only the critical validation features from the complete CIR data, specifically focusing on comparing peak positions and characteristics between received and reference CIRs. By taking out only the essential comparison elements rather than processing the entire CIR dataset, the system maintains measurement accuracy while reducing processing time.
Data Source
AI summary
A method for channel impulse response (CIR) validation for two-way ranging (TWR) in an ultra-wide band (UWB) communication system. The method includes: transmitting, by a first UWB device, a first cipher code; generating, by a second UWB device, a first CIR computed from an accumulation of the first cipher code; transmitting, by the second UWB device, a second cipher code in response to receiving the first cipher code; generating, by the first UWB device, a second CIR computed from an accumulation of the second cipher code; and comparing, by one of the first UWB device or the second UWB device, the second CIR with the first CIR.