Bluetooth Power Positioning via Multi-Level Signal Triangulation
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Solution Overview
Problem
Conventional power positioning methods for indoor devices face limitations in accuracy due to varying signal intensities of Bluetooth devices, leading to large positioning errors without additional sensors like gyroscopes or electronic compasses.
Innovation Solution
A power positioning method and device that utilize different transmission powers to establish a signal intensity-distance function and standard deviation, allowing for accurate positioning by emitting and receiving test signals at various distances, and calculating the intersection of concentric circles to determine the device's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed power signal is used for positioning, then the positioning method is simple, but the positioning accuracy is limited by the decline of single power signal
Solution Approach 1:
The positioning method segments the signal transmission into multiple power levels (first power, second power, third power) instead of using a single fixed power. This segmentation allows the system to overcome the limitations of single-power signal decline and improve positioning accuracy through multi-power signal comparison and processing.
2Measurement precision
If additional sensors like gyroscopes or electronic compasses are used, then positioning accuracy is improved, but device cost increases
Solution Approach 1:
The positioning system uses the Bluetooth signal itself at multiple power levels to achieve accurate positioning, eliminating the need for additional sensors like gyroscopes or electronic compasses. The method leverages the existing Bluetooth transmission capability to provide self-sufficient positioning functionality without increasing device complexity or cost.
3Ease of operation
If signal intensity varies greatly in Bluetooth devices, then the positioning method is easy to implement, but large positioning errors occur
Solution Approach 1:
The system changes the power parameter of Bluetooth signals to create multiple distinct signal levels (first power, second power, third power). By transmitting and processing signals at these different power levels, the system can distinguish between signal variations caused by transmission characteristics and actual distance changes, thereby reducing positioning errors while maintaining ease of implementation.
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 enhances positioning accuracy without requiring additional sensing modules, effectively reducing positioning errors by using the signal intensity-distance and standard deviation functions to triangulate the device's location.
Implementation Method 1
signal intensity-distance function, wherein the distances correspond to the RSSI's
Data Source
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AI summary
A power positioning method and a power positioning device are disclosed. The method comprises the steps of: controlling a device to be measured to transmit a plurality of positioning signals by a plurality of transmission powers; causing a plurality of known location devices to receive the plurality of positioning signals, and recording the plurality of positioning signal intensities, a plurality of corresponding receiving times and coordinates of the plurality of known location devices to a database; finding out the known location device with a larger signal intensity among the received plurality of positioning signals; taking out a signal intensity-distance function and a signal intensity-distance standard deviation function from the database; finding out the plurality of known location devices with the larger signal intensity among different powers according to the signal intensity-distance function and the signal intensity-distance standard deviation function; and grouping the plurality of known location devices according to a plurality of power to find out the device location of the device to be measured.