RFID Reader Tag Position Tracking for Retail Commodity Containers
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Solution Overview
Problem
Existing RFID systems in retail environments face challenges in accurately narrowing the communication range of RFID readers to prevent false readings of tags not placed in shopping carts, leading to errors in generating commodity lists.
Innovation Solution
A commodity container with a radio frequency reader that outputs tag information and time variation information, allowing a processor to determine the positional relationship between the RFID tag and the reader, thereby updating the commodity registration list accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the communication range of the RFID reader is expanded to cover the storage region, then the reader can detect tags in the container, but the reader may also read tags outside the container causing false readings
Solution Approach 1:
The patent applies local quality by analyzing the spatial distribution and signal characteristics of detected tags to distinguish between tags within the container and tags outside. The system evaluates the positional relationship and signal strength variations to identify which detected tags are genuinely associated with the container, thereby maintaining accurate detection while filtering out false readings from external sources.
2Object-affected harmful factors
If shielding is added to narrow the communication range, then false readings are prevented, but the device complexity increases
Solution Approach 1:
The patent replaces the mechanical shielding approach with an information processing solution. Instead of using physical barriers to limit communication range, the system uses software-based methods to analyze tag detection data, determine positional relationships, and filter false readings. This substitution eliminates the need for complex shielding structures while achieving the same goal of preventing false readings.
3Measurement precision
If the RFID reader reads all tags in communication range, then no tags are missed, but the commodity list includes incorrect items
Solution Approach 1:
The patent implements feedback by continuously monitoring the positional relationship between the container and detected tags, and using this information to dynamically update the commodity list. The system provides feedback loops that verify whether detected tags are genuinely associated with the container before adding them to the commodity list, ensuring accuracy while preventing inclusion of incorrect items.
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
Prevents erroneous input of tag information into the commodity list by determining the positional relationship between the RFID tag and the reader, ensuring accurate tracking of items within the container.
Implementation Method 1
a radio frequency reader with a communication range that covers at least part of an opening of the container space. The radio frequency reader is configured to output tag information based on a radio frequency signal received from a wireless tag attached to a commodity
Data Source
AI summary
A commodity container includes a main body with a container space and a radio frequency reader with a communication range that covers an opening of the container space. The radio frequency reader outputs tag information based on a radio frequency signal from a wireless tag and outputs time variation information indicating a time variation of the radio frequency signal. A registration device is attached to the main body and includes a communication interface to receive the tag and time variation information, and a processor configured to determine a time variation in a positional relationship of the wireless tag and the radio frequency reader based on the time variation information and update a commodity registration list based on the determined time variation of the positional relationship.