Smart Lock UWB Angle Antennas for Stable Proximity Unlocking
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Solution Overview
Problem
Existing smart door locks suffer from unstable unlocking and poor safety due to GPS fences and Bluetooth signals being scene-dependent, leading to uncertain opening distances and reduced security.
Innovation Solution
Integrating UWB angle antennas and iBeacon technology to establish a wireless smart unlocking mechanism that uses RSSI signal strength to determine distance and orientation, ensuring accurate unlocking within a 120° fan-shaped area of 2 meters, combined with automatic unlocking when the UWB angle antennas are within this range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GPS electronic fence and Bluetooth signal are used for wireless unlocking, then wireless smart unlocking function is achieved, but unlocking stability and security are poor due to scene-dependent signal strength
Solution Approach 1:
The unlocking judgment is segmented into multiple independent detection dimensions: Bluetooth RSSI signal strength detection, UWB distance detection, and angle antenna orientation detection. Each dimension independently evaluates the unlocking conditions, and only when all dimensions satisfy their respective thresholds is the unlocking executed. This segmentation prevents any single unstable signal from causing premature or incorrect unlocking.
Solution Approach 2:
The UWB distance detection and angle antenna orientation detection serve as intermediary verification mechanisms between the Bluetooth connection and the final unlocking action. These intermediaries provide additional layers of validation that filter out false positives from Bluetooth signal fluctuations, ensuring that unlocking only occurs when the user is genuinely at the correct position and orientation.
2Speed
If Bluetooth signal strength is used alone for unlocking judgment, then unlocking distance is extended, but security is reduced due to uncertain opening distance
Solution Approach 1:
The system transitions from one-dimensional Bluetooth signal strength detection to three-dimensional spatial verification by introducing UWB distance detection (radial dimension) and angle antenna orientation detection (angular dimensions). This multi-dimensional approach maintains the convenience of extended unlocking distance while adding spatial constraints that prevent unauthorized access from incorrect positions or angles.
Solution Approach 2:
The system dynamically adjusts the unlocking thresholds based on multiple parameters: RSSI signal strength threshold, UWB distance threshold (e.g., 2 meters), and angle antenna orientation threshold (e.g., 120° fan-shaped area). By monitoring changes in these parameters over time and requiring sustained satisfaction of all thresholds, the system accurately determines when the user is within the effective unlocking range while maintaining security.
3Measurement precision
If UWB angle antennas and multiple detection dimensions are added, then unlocking accuracy and security are improved, but device complexity increases
Solution Approach 1:
The mobile phone serves as a universal platform that integrates multiple detection functions: Bluetooth RSSI detection, UWB distance detection, and angle antenna orientation detection. By leveraging the existing computational resources and sensor capabilities of the smartphone, the system achieves high-precision multi-dimensional verification without proportionally increasing overall system complexity. The phone's processor handles the complex judgment logic, while the lock body primarily executes the physical unlocking action.
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 and user experience of smart door locks by ensuring accurate and stable unlocking, reducing mistakes and improving security through precise distance judgment.
Implementation Method 1
detecting position and orientation of the UWB angle antennas; determining whether the UWB angle antennas are within a 120° fan-shaped area within 2 meters directly in a front portion of the mobile phone
Implementation Method 2
detecting RSSI (Received Signal Strength Indicator) signal strength; using RSSI signal strength to determine distance
Data Source
AI summary
A smart unlocking technology using UWB angle antenna and iBeacon; in the present invention, UWB angle antennas are added to a smart lock for communication with iBeacon Bluetooth in the mobile phone, and signal strength detection technology of RSSI is used to effectively determine a distance between the mobile phone and the smart lock, effectively reducing situations of opening the door mistakenly or instability caused by unstable Bluetooth signals in traditional technologies; In addition, the UWB angle antennas have a range judgment of the 120° fan-shaped area within 2 meters; in this way, the recognition effects are maximized within the effective judgment distance, facilitating rapid unlocking in the effective area; the present invention solves problems during users' remote unlocking, and also ensures fast, effective and stable unlocking, which provides a guarantee for the development of smart door locks.