Vehicle Antenna Angle Detection for Signal Manipulation Protection
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Solution Overview
Problem
Existing methods for authorizing the use of motor vehicles lack effective protection against manipulation, particularly in preventing unauthorized access through signal manipulation.
Innovation Solution
A method utilizing spatially separated antennas and a motion sensor to determine the angle between electromagnetic field components, preventing signal manipulation by ensuring only authorized movements trigger authorization signals, with additional measures like timestamped movement patterns and multiple antennas for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna is used for vehicle authorization, then the device complexity is low, but the protection against signal manipulation is insufficient
Solution Approach 1:
The vehicle antenna system is segmented into multiple spatially separated antennas instead of using a single antenna. This segmentation allows the system to determine the spatial origin of authorization signals by comparing signal characteristics from different antenna positions, thereby detecting and preventing signal manipulation while maintaining manageable system complexity
Solution Approach 2:
A signal repeater is introduced as an intermediary element in the authorization process. The repeater receives authorization signals from the portable device and retransmits them to the vehicle antennas. This intermediary allows the system to detect signal parallelism and propagation time anomalies that indicate manipulation, enhancing security without requiring direct complex antenna interactions
2Reliability
If signal authorization is granted without movement detection, then the ease of operation is high, but the security against unauthorized access is reduced
Solution Approach 1:
The authorization system incorporates motion detection capabilities that dynamically assess the physical state of the portable device during the authorization process. The system requires detected movement as a condition for granting authorization, creating a dynamic security mechanism that adapts to the user's physical actions while maintaining operational convenience through automatic motion sensing
Solution Approach 2:
The system implements feedback through motion sensors that continuously monitor the portable device's movement status. This feedback mechanism provides real-time information about device movement, which is then used to validate or reject authorization requests, ensuring that only authorized movements trigger signal transmission while maintaining a smooth user experience
3Reliability
If the authorization system does not detect signal parallelism, then the device complexity is low, but the ability to detect manipulation is insufficient
Solution Approach 1:
The system analyzes authorization signals in the spatial dimension by using multiple spatially separated antennas to receive signals. By examining the spatial characteristics and propagation paths of signals from different antenna positions, the system can detect parallelism anomalies that indicate manipulation, adding a spatial dimension to signal analysis without requiring overly complex processing
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
The method significantly enhances protection against manipulation by recognizing and preventing unauthorized access through the detection of signal parallelism and movement patterns, ensuring secure vehicle authorization.
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 is provided with a motion sensor. The motion sensor preferably determines whether it, or the identification transmitter, is being moved
Implementation Method 3
the first vehicle antenna sends out an initial signal, which is received by the identification transmitter antenna
Data Source
AI summary
The invention relates to a method for authorising the use of a motor vehicle, which has at least a first and a second antenna, wherein the first antenna and the second antenna are spatially at a distance from one another, by means of a portable identification device having an identification device antenna. The first vehicle antenna emits a first signal, which is received by the identification device antenna. The identification device determines one of the spacial components of the first electromagnetic field of the received first signal. The second vehicle antenna emits a second signal, which is received by the identification device antenna. The identification device determines one of the spatial components of the second electromagnetic field of the received second signal. A computer determines the angle between the determined spatial components of the electromagnetic fields of the signals and the identification device emits an authorisation signal for authorising the use of the motor vehicle to the motor vehicle, if the determined angle exceeds a predetermined threshold value.