Stolen Vehicle Transmitter Jamming Detection via GPS Location
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Solution Overview
Problem
Existing vehicle anti-theft systems equipped with stolen vehicle transmitters (SVTs) are vulnerable to control channel jamming, leading to false alarms and unnecessary law enforcement responses, as they cannot distinguish between malicious and non-malicious jamming signals, especially when fixed-location jamming transmitters are present.
Innovation Solution
The system identifies authentic or malicious control channel signal changes by monitoring signal strength variations and comparing them to a database of known jamming locations, using a GPS to determine the current location and differentiate between fixed and mobile jamming sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SVT monitors control channel signals to detect jamming attempts, then the system can respond to potential theft attempts, but false alarms occur when encountering non-malicious jamming signals from fixed-location transmitters
Solution Approach 1:
The patent introduces GPS location data and a database of known jamming locations as an intermediary between the SVT and the control channel signal. By comparing the current GPS location with stored locations of legitimate jamming transmitters (e.g., at businesses), the system can distinguish between malicious and non-malicious jamming signals, thereby reducing false alarms while maintaining reliable theft detection
Solution Approach 2:
The system uses feedback by continuously monitoring control channel signal strength and comparing it against expected levels based on GPS location. When the SVT detects a jamming signal, it checks whether the current location matches a known legitimate transmitter location in the database. This feedback mechanism allows the system to adjust its response based on contextual information, preventing false alarms from legitimate business transmitters
2Reliability
If the SVT attempts to overcome all control channel jamming signals, then malicious jamming can be countered, but unnecessary law enforcement responses are triggered by legitimate business transmitters
Solution Approach 1:
The patent uses GPS location information and a database of known legitimate transmitter locations as an intermediary to filter jamming signals before triggering countermeasures. By checking whether the detected jamming signal originates from a known business location, the system可以避免 triggering unnecessary responses to legitimate transmitters while maintaining effective countermeasures against malicious jamming
Solution Approach 2:
The system applies different response strategies based on location context. When a jamming signal is detected at a location matching a known business transmitter in the database, the system does not trigger countermeasures or law enforcement responses. Conversely, when jamming is detected at unknown locations, the system activates full countermeasures including law enforcement notification, thereby optimizing resource allocation and reducing unnecessary responses
Data Source
AI summary
A signal on a wireless communication system control channel can be identified as authentic or malicious by monitoring control channel signal strength changes. When a control channel signal level increases abnormally, a geographic location is obtained from a navigation system, such as a GPS. The determined location is compared to locations in a data base of locations where control channel jamming transmitters are known to exist, and/or likely to exist. If the then-current location is not in the data base, the detected control channel signal level increase is considered to be malicious, i.e., from a jamming transmitter, often used by car thieves.