Vehicle Passive Entry Using Satellite Position Verification
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Solution Overview
Problem
Existing vehicle entry systems, particularly passive entry arrangements, are vulnerable to unauthorized access due to imprecise determination of the user's position, allowing transponder attacks and requiring continuous request signal transmission, which increases energy consumption.
Innovation Solution
The method involves using satellite-assisted position finding to accurately determine the positional difference between the user's mobile identification transmitter and the vehicle, enabling functions only when within a specified threshold, and authenticating the user's authentication code to activate vehicle functions securely, eliminating the need for continuous request signal transmission by the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If passive entry arrangements continuously transmit request signals to detect mobile identification transmitters, then the vehicle can enable passive functions when users approach, but the energy consumption increases due to constant signal transmission
Solution Approach 1:
The vehicle switches from continuous request signal transmission to periodic transmission, where request signals are sent only at predetermined intervals. This reduces energy consumption while still allowing the system to detect when a mobile identification transmitter is in proximity, thereby enabling passive functions only when needed.
2Adaptability or versatility
If the distance determination based on request signal field strength is used to enable vehicle functions, then passive entry can be implemented, but the position determination is imprecise allowing security-critical attacks
Solution Approach 1:
A distance value is introduced as an intermediary parameter that translates the request signal field strength into a more reliable distance measurement. This distance value is then used to compare against a threshold, providing a more accurate and secure determination of whether the mobile identification transmitter is within the allowed proximity range, thereby preventing unauthorized access attacks.
3Ease of operation
If request signals are continuously transmitted by the vehicle to maintain passive entry functionality, then users can unlock the vehicle without active key operation, but the system becomes vulnerable to transponder attacks from remote locations
Solution Approach 1:
The system transmits request signals periodically rather than continuously, which reduces the window of opportunity for transponder attacks while still maintaining the ability to detect authorized users. Combined with improved distance determination, this ensures that even if an attacker intercepts a signal, the imprecise distance measurement prevents false authorization from remote locations.
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
This approach significantly enhances security against unauthorized access and reduces energy consumption by ensuring precise positional verification and conditional activation of vehicle functions, thereby improving security and power efficiency.
Implementation Method 1
A first position is picked up by a GPS module of the mobile identification transmitter
Data Source
AI summary
The invention relates to a method for enabling one or more functions (FT) in a vehicle (FZ), in particular in a motor vehicle. The method involves one or more prescribed radio signals (FS) being transmitted from a mobile identification transmitter (IDG) and/or a device coupled to the mobile identification transmitter (IDG) to a vehicle-based evaluation device (STF).