Vehicle Cellular Jamming Detection Using Signal Correlation
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Solution Overview
Problem
Existing anti-theft systems in vehicles face false positive theft detections due to signal loss from jamming devices, which can also occur in tunnels, mountains, or rural areas, leading to unnecessary preventative actions.
Innovation Solution
A method and system that measure the strength and quality of received signals, calculate a correlation coefficient, and establish a heartbeat signal via a cellular network to distinguish between normal and jamming signals, triggering preventative actions only when jamming is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system triggers preventative actions when the monitoring signal is lost, then the vehicle security is improved, but false positive detections occur in tunnels, mountains, or rural areas
Solution Approach 1:
The patent introduces an intermediary analysis mechanism that uses correlation coefficient calculation between signal strength and signal quality as a mediator to distinguish between genuine theft jamming and natural signal loss. This intermediary metric allows the system to evaluate the relationship between two signal parameters before triggering preventative actions, thereby reducing false positives while maintaining security.
Solution Approach 2:
The system implements feedback by continuously monitoring both signal strength and signal quality parameters, calculating their correlation coefficient, and using this feedback to dynamically adjust whether preventative actions are triggered. The feedback loop enables the system to learn from signal patterns and differentiate between jamming attempts and natural signal variations in different geographical conditions.
2Loss of time
If the system monitors signal loss to detect theft, then response time is improved, but unnecessary preventative actions are triggered
Solution Approach 1:
Instead of triggering preventative actions immediately upon any signal loss (excessive action), the system applies partial action by first evaluating the correlation coefficient between signal strength and quality. Only when this correlation indicates genuine jamming does the system proceed to trigger preventative actions, thereby reducing false alarms while maintaining rapid response capability for actual theft attempts.
3Device complexity
If the system uses only signal presence/absence detection, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent changes the detection parameters from simple binary signal presence/absence to continuous measurement of two parameters: signal strength and signal quality. By measuring and comparing these two parameters through correlation coefficient calculation, the system achieves higher measurement precision in distinguishing jamming from natural signal loss without requiring overly complex additional hardware.
Data Source
AI summary
A vehicle includes a system that performs a method for preventing a theft of the vehicle. The system includes a communication device and a processor. The communication device is configured to receive an observed signal within a selected radio frequency band. The processor is configured to measure a strength of the observed signal, measure a quality of the observed signal, calculate a correlation coefficient between the strength of the observed signal and the quality of the observed signal, attempt to establish a heartbeat signal via a cellular network when the correlation coefficient meets a selected coefficient threshold, determine the observed signal to be a jamming signal when the heartbeat signal is not established, and control the vehicle to execute a preventative action for preventing the theft of the vehicle when the observed signal is determined to be the jamming signal.