Bluetooth Positioning Using Signal Angle Measurement
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Solution Overview
Problem
Existing anti-lost devices using short-distance communication technologies cannot accurately indicate the position of a lost device beyond the line-of-sight range, relying solely on signal strength which does not provide clear directional information for the user.
Innovation Solution
A method and device that utilize Bluetooth connection information to determine the position of a second device by measuring the angle of the received Bluetooth signal, allowing for intuitive and quick location of the device through position information sent to a third device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal strength-based methods are used to indicate device position, then the implementation is simple, but the position indication precision is poor
Solution Approach 1:
The patent transitions from one-dimensional signal strength measurement to two-dimensional angle measurement by introducing multiple antennas. The receiving angle measurement unit calculates the angle of arrival of Bluetooth signals using phase differences between multiple antennas, providing directional information that complements distance information from signal strength, thereby achieving precise two-dimensional position indication.
2Measurement precision
If multiple antennas are used to measure receiving angles, then the position determination precision is improved, but the device complexity increases
Solution Approach 1:
The receiving angle measurement unit utilizes existing Bluetooth signal reception capabilities and extends them to perform angle measurement functions. The same Bluetooth module that receives signals for distance determination via signal strength is also used for angle determination through phase difference calculation, making the system multi-functional without requiring completely separate hardware subsystems.
3Measurement precision
If Bluetooth connection information is used to obtain device position, then the measurement precision is improved, but the loss of time increases due to additional processing
Solution Approach 1:
The system performs preliminary Bluetooth connection establishment and signal reception before position determination is needed. When the anti-lost device is activated, the Bluetooth connection is re-established and signals are received in advance, so that when position information is required, the calculation can be performed immediately using already-received signals, reducing the time delay for position determination.
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
Enables users to intuitively and quickly locate a second device by determining its position relative to the first device, overcoming the limitations of signal strength-based methods by using multiple antennas to calculate receiving angles and send precise location information.
Implementation Method 1
a first device obtains Bluetooth connection information of a second device, obtains, according to the Bluetooth connection information, a Bluetooth signal sent by the second device, determines, according to the obtained Bluetooth signal sent by the second device, position information of the second device
Data Source
AI summary
A method includes obtaining, by a first device, BLUETOOTH connection information of a second device, obtaining, by the first device according to the BLUETOOTH connection information, a BLUETOOTH signal from the second device, determining, by the first device according to the obtained BLUETOOTH signal from the second device, position information of the second device, and sending, by the first device, the position information to a third device.