UWB Key Position Detection for Front-Back Electronic Lock Access
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Solution Overview
Problem
Existing short-range wireless communication technologies for electronic locks, such as Bluetooth Low Energy (BLE) and Ultra High Frequency (UHF), face issues with unintentional unlocking when an authorized portable key device is within range, leading to potential unauthorized access, especially when a user walks past the lock.
Innovation Solution
A method and system using ultra-wideband (UWB) technology to determine the location of a portable key device relative to an electronic lock by analyzing channel impulse responses (CIR) from multiple antennas, distinguishing between line-of-sight and non-line-of-sight conditions to differentiate between the front and back sides of the lock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If short-range wireless communication with longer communication range (e.g., Bluetooth Low Energy, Ultra High Frequency) is used, then the portable key device can stay in a pocket or handbag and still be used for access control, but the electronic lock could unintentionally be unlocked when a person walks past the electronic lock on the inside
Solution Approach 1:
The patent transitions from determining only the presence of a key device to determining its spatial dimension (front side vs. back side) by analyzing the Channel Impulse Response characteristics. This dimensional differentiation allows the system to distinguish between authorized proximity (outside the barrier) and unauthorized proximity (inside the barrier), resolving the contradiction between convenience and reliability.
2Power
If RFID is used with a relatively large antenna in the reader, then wireless communication can be established, but a large amount of energy is used and the user must actively take out the portable key device and bring it within centimetres of the lock
Solution Approach 1:
The patent changes the communication parameters by using impulse-based UWB signals instead of continuous RFID signals. This allows for shorter transmission bursts with lower peak power requirements, reducing overall energy consumption while maintaining wireless communication capability. The impulse signal approach enables communication without requiring the key device to be actively presented within centimeters of the lock.
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 the reliability of access control by ensuring unlocking only occurs when the key device is on the intended outside side, preventing unauthorized access due to accidental proximity detection.
Implementation Method 1
obtaining a channel impulse response, CIR, based on an impulse signal transmitted from the portable key device, the CIR being based on a plurality of samples of the impulse signal as received by an antenna
Data Source
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Figure 3A~3B
AI summary
It is provided a method for determining when a portable key device is located on a front side or on a back side in relation to a barrier secured by an electronic lock. The method is performed in a location determiner and comprises the steps of: obtaining a channel impulse response, CIR, based on an impulse signal transmitted from the portable key device, the CIR being based on a plurality of samples of the impulse signal as received by an antenna being fixedly mounted in relation to the electronic lock; and determining, based on the CIR, whether the portable key device is located on the front side or on the back side.