Vehicle Access Security via Multi-Antenna Signal Vectoring
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Solution Overview
Problem
Existing motor vehicle access and start systems are susceptible to manipulation by third parties due to the difficulty in achieving high measurement accuracy required for signal verification, leading to potential unauthorized use.
Innovation Solution
A method involving at least two vehicle-side antennas emitting electromagnetic signals independently and simultaneously, with the measuring device capturing field strengths as components at right angles, allowing for vector summation and comparison to verify the identification transmitter, thereby enhancing security without needing an external evaluation unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal verification is performed using conventional single-antenna systems, then the system is simpler to implement, but the security against manipulation by third parties is insufficient
Solution Approach 1:
The patent divides the verification system into multiple independent antennas (at least two) that transmit signals through different spatial paths. Each antenna's signal is measured separately by the identification transmitter, creating segmented verification channels that are harder to manipulate than a single channel system.
Solution Approach 2:
The patent introduces spatial dimensionality by arranging antennas at different locations and orientations. The identification transmitter measures signals from multiple spatial directions, adding a dimensional aspect to verification that makes signal manipulation more difficult while maintaining reasonable system complexity.
2Reliability
If high measurement accuracy is required for signal verification, then the security is improved, but the measurement accuracy is difficult to achieve in practice
Solution Approach 1:
The patent implements a feedback mechanism where the identification transmitter measures signals from multiple antennas and sends verification results back to the vehicle system. The evaluation unit processes these measurements and provides feedback on whether access should be granted, creating a closed-loop verification system that improves reliability without requiring extremely high measurement precision from individual sensors.
Solution Approach 2:
The patent combines signals from multiple antennas into a unified verification process. By merging the measurement data from at least two antennas through the evaluation unit, the system achieves more reliable verification than any single antenna could provide alone, while distributing the measurement burden across multiple components.
3Area of stationary object
If multiple antennas are used for signal transmission, then the coverage area is increased, but the system becomes more vulnerable to signal disruption by third parties
Solution Approach 1:
The patent employs asymmetric antenna arrangements where antennas are positioned at different locations and orientations around the vehicle. This asymmetry creates multiple unique signal paths that are difficult for third parties to disrupt simultaneously, while still providing comprehensive coverage area for legitimate users.
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 increases the security of motor vehicle start and access systems by providing a more detailed evaluation of signal measurements, reducing the risk of unauthorized access through improved signal verification.
Implementation Method 1
at least two antennas arranged in different places on the vehicle each emit a first electromagnetic signal time independently from each other, which is measured by a measuring device in the identification transmitter
Data Source
AI summary
A method for start and access verification of a motor vehicle by means of a mobile identification transmitter (3) with an evaluation unit arranged in the identification transmitter (3). At least two antennas (1, 2) arranged in different places on the vehicle in any order: each emit time independently an electromagnetic signal which is measured by a measuring device in the identification transmitter (3), and each simultaneously emit an electromagnetic signal which is measured by the measuring device in the identification transmitter (3). Thus, the security of start and access systems of motor vehicles is increased.