Receiver Clock-Bias Correction for Decoy Attack Localization
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Solution Overview
Problem
Existing satellite radionavigation systems are vulnerable to decoy attacks, which corrupt position, velocity, and time information, and current countermeasures are complex and costly without effective decoy position detection.
Innovation Solution
A method and device for determining the position of a decoy using corrected clock biases based on differential measurements, estimating the drift of the receiver's clock relative to the decoy or GNSS system, and employing multilateration techniques to localize the decoy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryptographic signal security measures are implemented to counter decoy attacks, then the reliability of the radionavigation system is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The receiver autonomously detects decoy attacks and determines decoy position using its own clock bias measurements and drift estimates, without requiring external reference stations or complex cryptographic verification systems. The system serves itself by internally processing clock bias data to identify and locate decoys, eliminating the need for additional complex security infrastructure.
2Measurement precision
If external reference stations with enhanced processing capacities are used to correct measurements, then the measurement precision is improved, but the loss of time increases due to remote processing operations
Solution Approach 1:
The invention extracts the essential function of decoy detection and position determination from complex external reference stations and implements it within the receiver itself using clock bias measurements. By taking out only the necessary measurement data (clock bias and drift estimates) and processing it locally, the system achieves precise decoy localization without the time delays associated with remote processing.
3Reliability
If complex processing operations are performed remotely in reference stations, then the reliability of signal verification is improved, but the ease of operation deteriorates
Solution Approach 1:
The receiver independently performs decoy detection and position determination using its own clock bias measurements, eliminating the need for complex remote verification processes. The system automatically estimates clock drift, calculates corrected clock biases, and determines decoy position without requiring external intervention or complex operational procedures.
Data Source
AI summary
A method for determining the position of a decoy using at least one receiver, the method includes a step for detecting a decoy attack, a step for correcting the clock bias delivered by the receiver based on an estimated drift (Dj) of the clock of the receiver. The method comprises a step for differential measurements using at least three corrected clock biases (CBjcorr(t″), CBkcorr(t″), CBlcorr(t″)) and a localization step for determining the position of the decoy.