Uplink Access Point Phase Difference Positioning
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Solution Overview
Problem
Existing indoor positioning technologies are inefficient and costly, with methods like cell ID, multilateral positioning using RSSI, and RF fingerprinting facing errors, increased infrastructure costs, and sensitivity to environmental changes.
Innovation Solution
A device and method utilizing an uplink access point with multiple antennas to estimate user terminal position by measuring phase differences between carrier waves, allowing for efficient indoor positioning without wired data connections, using Wi-Fi or Bluetooth signals, and incorporating inertial and geomagnetic sensors for accurate location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multilateral positioning method using RSSI is used, then position estimation is achieved, but throughput is reduced due to signal interference and infrastructure cost increases
Solution Approach 1:
The patent introduces phase difference as an intermediary measurement parameter between the user terminal and access points. Instead of directly using RSSI which causes interference, the system uses phase difference of carrier waves received at multiple antennas as a mediator to estimate position, thereby avoiding the throughput reduction caused by RSSI-based multilateral positioning while maintaining positioning accuracy.
Solution Approach 2:
The patent changes the measurement parameter from RSSI (signal strength) to phase difference of carrier waves. This parameter change allows position estimation to be performed without the signal interference problems that plague RSSI-based methods, thus maintaining throughput while achieving accurate positioning through phase-based measurements at multiple antennas.
2Measurement precision
If RF fingerprint method is used, then position estimation is achieved, but calculation complexity increases and environmental sensitivity increases
Solution Approach 1:
The patent replaces the complex RF fingerprint matching system with a simpler phase difference measurement system. Instead of maintaining large databases of RF fingerprints and performing complex pattern matching calculations, the system uses direct phase difference measurements from multiple antennas to calculate position, significantly reducing computational complexity while maintaining accuracy.
Solution Approach 2:
The patent changes from using RF signal strength fingerprints to using phase difference parameters. This parameter change simplifies the positioning calculation from complex database matching to straightforward trigonometric calculations based on phase differences, reducing both computational complexity and environmental sensitivity.
3Ease of manufacture
If cell ID method is used, then infrastructure cost is reduced, but positioning error increases
Solution Approach 1:
The patent segments the positioning measurement into multiple phase difference measurements taken at different antennas within the same access point infrastructure. This segmentation allows the system to maintain the simple cell ID infrastructure while adding phase difference measurements as a supplementary layer, thereby reducing positioning error without requiring additional infrastructure.
Solution Approach 2:
The patent adds a new dimension to the positioning measurement by using phase difference information in addition to cell ID. While cell ID provides coarse positioning, the phase difference dimension provides fine-grained position information, combining both to achieve accurate positioning with minimal infrastructure cost.
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 efficient indoor positioning with reduced costs by using phase differences between carrier waves received by multiple antennas, providing accurate location estimation and minimizing infrastructure requirements.
Implementation Method 1
a position of the user terminal 300 is estimated using a phase difference between carrier waves reaching the first antenna and the second antenna from the user terminal 300
Data Source
AI summary
Provided are a device and a method for position estimation using an uplink access point, and more particularly, a device and a method for position estimation capable of estimating a position of a user terminal by allowing an uplink access point including at least two antennas to receive signals transmitted from the user terminal and using a phase difference between the received signals.