Vertical RFID Reader Array with Overlapping Zones
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Solution Overview
Problem
Conventional wireless tag reading systems face difficulties in efficiently reading a large number of RFID tags densely arranged, such as in a library setting, due to interference and missed readings when tags are densely positioned, leading to slow processing times and potential collisions.
Innovation Solution
The system employs multiple tag readers arranged vertically on a moving body with overlapping reading ranges and adjustable frequencies to prevent interference, allowing for simultaneous and efficient reading of RFID tags without omitting any tags, even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a mobile body with tag readers moves around to read RFID tags in a library, then the system can cover a wide area, but it is difficult to read each RFID tag at high speed when tags are densely positioned
Solution Approach 1:
The system divides the reading task into multiple parallel operations by deploying multiple tag readers (first tag reader, second tag reader, etc.) that simultaneously read different groups of RFID tags. This segmentation allows the system to maintain high reading speed across wide areas without requiring a single mobile body to visit every location sequentially.
Solution Approach 2:
The tag readers are arranged in a spatial configuration where reading ranges overlap in three-dimensional space. By positioning readers at different locations and orientations, the system creates multiple reading zones that collectively cover the entire library area, enabling simultaneous reading operations across different spatial dimensions.
2Productivity
If multiple tag readers are used to read densely arranged RFID tags, then reading speed improves, but tag collisions and interference increase
Solution Approach 1:
The system dynamically adjusts the frequency of radio waves used by each tag reader. The first tag reader and second tag reader operate at different frequencies, and these frequencies can be changed over time. This dynamic frequency adjustment prevents persistent interference and collisions between readers while maintaining high reading speeds.
Solution Approach 2:
The system changes operational parameters (radio wave frequency) of the tag readers to optimize performance. By varying the frequency parameter, the system reduces interference between multiple readers and improves both reading speed and accuracy in densely tagged environments.
3Device complexity
If tag readers operate at fixed frequencies, then system complexity is reduced, but interference and missed readings occur when tags are densely positioned
Solution Approach 1:
The tag readers are equipped with the capability to dynamically change their operating frequencies. This dynamic adjustment allows the system to adapt to dense tag environments by avoiding frequency conflicts, thereby improving reading reliability without requiring overly complex fixed-frequency allocation schemes.
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 configuration enables high-speed inventory management by reducing the likelihood of tag collisions and ensuring all RFID tags are read without interference, thereby shortening processing time and improving the accuracy of inventory processing.
Implementation Method 1
communicate with each other using a plurality of frequencies
Data Source
AI summary
A wireless tag reading system includes a body and three or more tag reading apparatuses arranged along a vertical direction on the body and configured to read identification information from wireless tags using a plurality of frequencies. A total number of the tag reading apparatuses is greater than or equal to a total number of the frequencies, and reading ranges of two of the wireless tag reading apparatuses that are adjacent to each other partially overlap. The wireless tag reading system further includes an information processing apparatus configured to collect the identification information read from the wireless tags by the wireless tag reading apparatuses.