RFID Location Tag With Accelerometer For Indoor Positioning
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Solution Overview
Problem
Current RFID systems lack the accuracy and cost-effectiveness needed for precise indoor location tracking, especially in environments where GPS is not applicable, and they are not easily deployable on a large scale.
Innovation Solution
An improved RFID location tag system comprising an RFID controller, memory, power management module, and accelerometer, which periodically polls tags for information, receives signal strength indications, and calculates positions using reference tags, along with a graphical visualization system for data representation and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional RFID systems are used for location tracking, then the system is simple and cost-effective, but the positioning accuracy is insufficient for precise indoor location tracking
Solution Approach 1:
The patent combines RFID technology with accelerometer sensors and power management modules into an integrated location tag system. The RFID controller, accelerometer, and power management module work together as a unified system, allowing the device to achieve precise positioning through sensor data fusion while maintaining cost-effectiveness and simplicity in deployment
Solution Approach 2:
The location tag serves multiple functions: RFID identification, acceleration sensing, power management, and positioning. This multi-functional design allows a single device to replace multiple separate systems, achieving high positioning accuracy without proportionally increasing system complexity
2Measurement precision
If GPS is used for location tracking, then positioning accuracy is high, but the system cannot be used indoors and is not cost-effective for mass deployment
Solution Approach 1:
The patent replaces GPS satellite-based electromagnetic positioning with a ground-based RFID system enhanced by accelerometer sensors. This substitution enables indoor positioning by using local RFID readers and motion sensing data, achieving GPS-level accuracy in environments where GPS signals are unavailable
Solution Approach 2:
The accelerometer acts as an intermediary between the RFID system and the positioning calculation. It provides motion data that complements RFID signal strength measurements, enabling accurate indoor positioning through sensor fusion without requiring direct satellite signals
3Reliability
If RFID tags are deployed on hundreds of objects for tracking, then coverage is improved, but the cost and system complexity increase significantly
Solution Approach 1:
The patent uses identical location tags with standardized RFID controllers, accelerometers, and power management modules across all tracked objects. This homogeneous design simplifies deployment and management, allowing hundreds of tags to be deployed with consistent performance and ease of replacement, maintaining low complexity despite high coverage
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 system achieves accurate positioning within a few centimeters, enabling efficient and cost-effective indoor location tracking without the need for GPS, and provides a graphical representation of data for improved decision-making.
Implementation Method 1
Radio Frequency Identification (RFID) tags attached to objects are primarily used for automatic identification. RFID tags can be active, passive or semi-passive. Active and semi-passive tags have a battery or source of power while passive tags use power harvested from received RF signal.
Implementation Method 2
an accelerometer, wherein the method comprises the steps of: periodically polling the RFID tags for information
Implementation Method 3
calculating for each non reference and referenced RFID tag a received signal strength indication; and calculating an initial position for each non reference RFID tag based on the received signal strength indications and the positions of the reference RFID tags
Data Source
AI summary
A positioning determination method using an improved RFID location tag is described the tag including an RFID controller; memory; a power management module; and an accelerometer. The position determination method including the steps of periodically polling the RFID tags for information; receiving information from a plurality of reference RFID tags at a known location; receiving information from the non reference RFID tags, the information including the tag id and sensor data; calculating for each non reference and referenced RFID tag a received signal strength indication; and calculating an initial position for each non reference RFID tag based on the received signal strength indications and the positions of the reference RFID tags.