Vehicle Security System Using Electromagnetic Field Gradient Detection
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Solution Overview
Problem
Existing motor vehicle security systems can be compromised by unauthorized individuals imitating electromagnetic signals, allowing them to gain access to the vehicle despite not being in proximity to the transmitter.
Innovation Solution
The security system analyzes not only the electromagnetic signal code but also the spatial and temporal gradient of the field emitted by multiple transmitters, ensuring that only the correct, predefined gradient allows access, making signal imitation complex and noticeable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the security system uses only electromagnetic signal code verification, then the system is simple to operate, but unauthorized persons can imitate signals and gain access
Solution Approach 1:
The patent transitions from verifying only the electromagnetic signal code (one dimension) to also verifying the spatial gradient characteristics of the field (adding another dimension). By measuring the gradient of the electromagnetic field in addition to the code, the system creates a multi-dimensional verification mechanism that prevents signal imitation while maintaining operational simplicity for authorized users.
Solution Approach 2:
The patent introduces a new verification parameter - the spatial gradient of the electromagnetic field - in addition to the existing signal code verification. This parameter change enables the system to distinguish between authentic transmitters and imitators by detecting the unique gradient characteristics that arise from the physical arrangement of multiple transmitters on the vehicle.
2Reliability
If multiple transmitters are arranged to create a homogeneous field, then signal imitation becomes difficult, but the device complexity increases
Solution Approach 1:
The patent divides the security system into multiple segmented transmitters arranged at different locations on the vehicle (e.g., front and rear). Each transmitter contributes to creating the overall electromagnetic field, and the segmented arrangement ensures that the spatial gradient characteristics are unique to the vehicle's configuration, making signal imitation difficult while allowing the system to maintain a manageable number of components.
3Ease of operation
If the system requires proximity verification only, then the operation is simple, but thieves can forward signals from a distance
Solution Approach 1:
The patent replaces the simple proximity-based mechanical verification system with an electromagnetic field gradient measurement system. Instead of relying solely on the presence of the field (which can be forwarded), the system measures the spatial gradient characteristics of the field, which inherently verify that the receiver is in the correct physical location near the vehicle, thus preventing remote signal forwarding while maintaining ease of operation for authorized 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 prevents unauthorized access by making it difficult for thieves to replicate the specific field gradient, thereby ensuring secure vehicle entry only by authorized users.
Implementation Method 1
a transmitter which transmits a signal in the form of an electromagnetic field
Implementation Method 2
the gradient of the electromagnetic field is detected by the transportable receiver
Data Source
AI summary
In order to provide a security system, in particular in a motor vehicle (10), comprising a transmitter which transmits a signal in the form of an electromagnetic field (11, 14) and a transportable receiver (12) which receives the signal and sends back a corresponding response signal to a further receiver, in which it is more difficult to imitate the signal transmitted by the transmitter, it is proposed that a gradient of the electromagnetic field (11, 14) can be detected by the receiver (12).