Phase-Based Indoor Positioning With Speed Correction
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Solution Overview
Problem
Current indoor positioning techniques face challenges such as low ranging accuracy, reliance on pre-created maps, and susceptibility to shadowing and multipath errors, particularly with GPS and GNSS signals not reaching indoors, and existing wireless signal-based methods like RSSI being prone to measurement errors.
Innovation Solution
A communication apparatus and system that utilizes a phase-based method to generate distance information by measuring phase characteristics in a propagation channel, incorporating a speed sensor to correct phase differences and improve accuracy, and includes a BLE communication method for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phase-based method is used to generate distance information, then measurement precision is improved, but reliability deteriorates when the transmission side moves due to occurrence of measurement errors
Solution Approach 1:
The patent applies feedback by using the acceleration sensor to detect movement of the transmission side and feeding this information back to correct the phase characteristic. The correction value derived from acceleration data compensates for phase shifts caused by movement, thereby maintaining measurement reliability while preserving the high precision of phase-based distance measurement.
Solution Approach 2:
The patent changes the parameter being measured by switching from direct phase difference measurement to acceleration-based movement detection. By measuring acceleration and integrating it to obtain displacement, the system obtains a correction value that accounts for transmission side movement, thus adapting the measurement approach to maintain reliability under dynamic conditions.
2Ease of operation
If RSSI technique is used for ranging, then ease of operation is improved, but measurement precision deteriorates due to multipath and signal strength errors
Solution Approach 1:
The patent substitutes the RSSI signal strength-based ranging method with a phase-based measurement method. By replacing the mechanical/electrical signal strength measurement with phase difference measurement, the system achieves higher precision while maintaining operational simplicity through automated phase-based distance calculation.
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
The solution provides accurate distance measurement and reliable positioning with reduced errors, even when the transmission side is moving, by using phase characteristics and movement speed corrections, enhancing the precision and reliability of indoor positioning.
Implementation Method 1
a phase acquisition unit that acquires a phase characteristic of a frequency in a propagation channel with a different communication apparatus
Implementation Method 2
The speed sensor unit may be one of an acceleration sensor and an inertial measurement unit in which multiple sensors are combined
Data Source
AI summary
[Object]Distance information can be acquired with a high degree of accuracy by a simple configuration, and positioning of high reliability is performed.[Solving Means]A communication apparatus includes a phase acquisition unit that acquires a phase characteristic of a frequency in a propagation channel with a different communication apparatus, a distance generation unit that generates distance information in reference to the phase characteristic, and a speed sensor unit that measures a movement speed of a transmission side of the propagation channel, the movement speed being usable for correction of the phase characteristic.