RFID Tag Location Tracking via Power Level Codes
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Solution Overview
Problem
Conventional RFID tag locating systems rely on complex and expensive triangulation techniques that require precise timing information and line-of-sight communication, making them costly and inaccurate for precise location determination.
Innovation Solution
A system using a first RFID device that transmits messages with unique identifying information and power level codes, allowing a second RFID device to process these messages and provide location indications without the need for precise timing, enabling simpler and less expensive RFID device implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If triangulation techniques with precise timing are used, then location accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs inexpensive RFID tags instead of expensive triangulation readers. The tags are simple, low-cost devices that transmit location information passively, eliminating the need for complex, costly reader infrastructure required by triangulation systems.
Solution Approach 2:
The patent replaces the complex mechanical/electronic timing synchronization system of triangulation with a simpler information-based approach. RFID tags carry location data in their transmissions, eliminating the need for precise timing measurements and complex signal processing infrastructure.
2Measurement precision
If triangulation techniques with multiple readers are used, then location accuracy is improved, but system cost increases
Solution Approach 1:
The patent uses low-cost RFID tags attached to objects instead of expensive fixed readers. Each tag is a inexpensive, portable device that provides location information, replacing the costly infrastructure of multiple synchronized readers required by triangulation.
Solution Approach 2:
The patent creates a simplified copy of the triangulation concept by having RFID tags carry location information in their transmissions. Instead of calculating position from timing differences, the tags directly encode location data, providing the same functionality at much lower cost.
3Measurement precision
If line-of-sight communication is required, then triangulation accuracy is improved, but adaptability to different environments decreases
Solution Approach 1:
The patent replaces the line-of-sight electromagnetic signal requirement of triangulation with RFID communication that can penetrate obstacles. RFID tags work through walls and barriers, providing location tracking in environments where line-of-sight triangulation would fail.
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 allows for accurate location determination of RFID tags using a network of relay devices without the complexity and expense of traditional triangulation methods, providing reliable and efficient RFID monitoring.
Implementation Method 1
the first RFID device transmits at least two messages each including unique identifying information and a power level code
Data Source
AI summary
An RFID monitoring arrangement comprises a first RFID device and a second RFID device for monitoring the first RFID device. The first RFID device transmits at least two messages each including unique identifying information and a power level code, wherein the transmitter power level corresponds to the power level represented by the power level code in each transmitted message. The second RFID device receives messages transmitted by the first RFID device and processes the identifying information and the power level code to provide an indication of a condition. Messages received from said first RFID device, the indication of a condition, or both the messages received from said first RFID device and the indication of a condition, may be relayed to a remote location.