RFID Reader Placement Using Lidar for Dense Tag Coverage
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Solution Overview
Problem
In environments with a dense population of RFID tags, existing RFID readers struggle to read all tags due to signal blocking and scattering, necessitating multiple readers that can be costly and inefficiently spaced, and physical obstacles complicate optimal placement.
Innovation Solution
A method involving lidar scans and adjustable mounts to determine intended RFID reader locations, ensuring coverage volumes intersect at predetermined heights, and iterative adjustments to eliminate gaps, using a central controller for precise tag location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple RFID readers are installed to read all tags in dense environments, then tag readability is improved, but system cost and installation complexity increase
Solution Approach 1:
The patent performs preliminary power calculations and coverage analysis before installing RFID readers to determine optimal locations. This preliminary planning ensures that readers are positioned to maximize tag readability while minimizing the number of readers needed, thereby reducing installation complexity and cost while maintaining reliable tag reading coverage.
2Reliability
If RFID readers are spaced closer together to ensure complete tag coverage, then tag readability is improved, but the number of readers and system cost increase
Solution Approach 1:
The patent uses power calculations to determine optimal reader spacing based on environmental parameters such as ceiling height, wall locations, and fixture positions. By analyzing how signal power varies with distance and environment, the system can space readers farther apart than conservative estimates would suggest, reducing the total number of readers needed while maintaining complete tag coverage.
3Ease of manufacture
If RFID readers are installed without considering physical obstacles, then installation simplicity is maintained, but signal blocking and scattering reduce reading reliability
Solution Approach 1:
The patent performs preliminary analysis of the installation environment by measuring ceiling heights, wall locations, and fixture positions before installing readers. This advance planning identifies optimal locations that avoid physical obstacles that would block or scatter RF signals, ensuring reliable signal transmission without requiring complex adjustments during installation.
4Productivity
If RFID readers are deployed without power calculations, then deployment speed is maintained, but readers may be spaced unnecessarily close increasing system cost
Solution Approach 1:
The patent performs power calculations based on environmental parameters (ceiling height, wall distances, fixture positions) to determine the actual coverage range of each reader. This allows readers to be spaced farther apart than would be chosen without calculations, reducing the total number of readers needed while maintaining complete coverage, without significantly impacting deployment speed.
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
Ensures complete RFID tag readability with optimized reader placement, reducing costs and installation complexity while maintaining reliable communication.
Implementation Method 1
The ceiling heights, locations of walls and/or fixtures, and actual locations of the RFID readers can be measured by performing lidar scans of the installation site
Implementation Method 2
Passive RFID tags essentially modulate and backscatter energy from an RF interrogation pulse sent by the RFID reader to transmit a reply
Data Source
AI summary
Methods and apparatus for deploying RFID readers in an RFID environment that contains dense populations of tags are described. The RFID readers are deployed using a process that provides adequate link margins so that communication can be established with RFID tags in all regions of interest within the RFID environment.