Vehicle Authorization Using Angle-Resolving Magnetic Field Sensors
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Solution Overview
Problem
Existing methods for authorizing the use of motor vehicles lack effective protection against manipulation, particularly tampering with signals used for authorization.
Innovation Solution
A method utilizing two spatially spaced antennas and an angle-resolving magnetic field sensor to determine the spatial components of electromagnetic fields, combined with a motion sensor to detect movement and prevent unauthorized signal transmission, ensuring the angle between signals exceeds a threshold for valid authorization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna is used for authorization, then the device complexity is reduced, but the protection against manipulation is insufficient
Solution Approach 1:
The system divides the single antenna function into multiple spatially separated antennas (first antenna and second antenna). Each antenna independently transmits signals and the system evaluates multiple signal paths to determine authorization, thereby increasing security against manipulation while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The patent introduces an angle-resolving magnetic field sensor as an intermediary component that measures the spatial relationship between antennas and identifier. This sensor acts as a mediator to verify the geometric configuration of signal transmission, adding a layer of manipulation detection without significantly increasing overall system complexity
2Reliability
If signal transmission is allowed without movement detection, then the ease of operation is improved, but the security against unauthorized access is reduced
Solution Approach 1:
The system dynamically evaluates authorization based on real-time movement detection. The motion sensor continuously monitors for movement, and authorization is granted only when movement is detected, creating a dynamic security mechanism that adapts to user behavior patterns while maintaining ease of legitimate operation
Solution Approach 2:
The motion sensor performs preliminary detection of movement before authorization is granted. By checking for movement in advance of the authorization decision, the system ensures that only legitimate users who physically approach the vehicle can gain access, preventing unauthorized remote activation while maintaining smooth operation for legitimate users
3Reliability
If repeaters are used to extend signal range, then the communication range is increased, but the angle information is lost and manipulation becomes possible
Solution Approach 1:
The patent replaces electromagnetic signal-based position determination with a magnetic field sensing mechanism. The angle-resolving magnetic field sensor directly measures the spatial configuration of antennas through magnetic field interactions, providing robust angle information that cannot be spoofed by signal repeaters, thereby maintaining reliability while allowing flexible signal transmission
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
Enhances security by preventing manipulation of radio links and ensuring only valid movements trigger authorization signals, thereby improving protection against tampering.
Implementation Method 1
the identification transmitter determines at least one of the spatial components of the first electromagnetic field of the received first signal, preferably using an angle-resolving magnetic field sensor
Implementation Method 2
the identification transmitter is or will be provided with a motion sensor. The motion sensor determines whether it or the ID transmitter is being moved
Implementation Method 3
the first vehicle antenna emits a first signal, which is received by the ID transmitter antenna
Implementation Method 4
the first vehicle antenna emits a first signal, which is received by the ID transmitter antenna
Data Source
AI summary
The invention relates to a method for authorizing the use of a motor vehicle, which has at least one first and one second antenna, wherein the antennae are spaced apart from each other, by means of a portable identification transmitter, which has an identification transmitter antenna. The first vehicle antenna sends out a first signal, which is received by the identification transmitter antenna. The identification transmitter identifies one of the spatial components of the first electromagnetic field of the received first signal. The second vehicle antenna transmits a second signal that is received by the identification transmitter antenna. The identification transmitter identifies one of the spatial components of the second electromagnetic field of the received second signal. The identification transmitter transfers the data to the vehicle. A computer determines the angle between the spatial components and the vehicle provides an authorization signal if the determined angle exceeds a predetermined threshold value.