RFID Transponder Assignment via Phase and Velocity Analysis
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Solution Overview
Problem
Existing RFID systems face challenges in reliably assigning multiple transponders to containers or objects within a detection area, often resulting in incorrect assignments due to overlapping detection ranges and the need for complex algorithms or physical separation of items.
Innovation Solution
An RFID device capable of determining the location and speed of transponders using angle and signal strength information, allowing for a reliable m-to-n assignment of object transponders to container transponders without the need for physical separation, using phase methods and multiple antennas to resolve ambiguities and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transponders are read simultaneously in overlapping detection ranges, then reading efficiency is improved, but assignment reliability deteriorates due to misidentifications
Solution Approach 1:
The patent introduces a temporal dimension to the assignment process by performing multiple reading cycles and evaluating consistency over time. Transponders are assigned to containers based on their presence across multiple time points, not just a single reading. This temporal filtering resolves the contradiction by maintaining high reading efficiency while improving assignment reliability through consistency verification.
Solution Approach 2:
The system implements feedback mechanisms where assignment results from previous reading cycles inform subsequent assignments. The evaluation unit continuously monitors transponder-container associations and adjusts assignments based on accumulated evidence, resolving ambiguities that arise from simultaneous readings of multiple transponders in overlapping detection ranges.
2Measurement precision
If physical separation of items is implemented to ensure accurate reading, then assignment accuracy is improved, but device complexity and infrastructure requirements worsen
Solution Approach 1:
The patent replaces mechanical/physical separation systems (such as RFID reading tunnels with conveyor belts that isolate containers) with an algorithmic evaluation system. Instead of physically separating items to ensure accurate reading, the system uses software-based evaluation units that analyze reading patterns and determine assignments through logical processing, thereby reducing infrastructure complexity while maintaining accuracy.
Solution Approach 2:
The system creates virtual models of the reading process by performing multiple readings and evaluating consistency patterns. Rather than requiring physical isolation, it copies the detection process multiple times and uses the accumulated data to resolve ambiguities, achieving accurate assignments without complex physical infrastructure.
3Device complexity
If conventional RFID reading methods are used without position determination, then device simplicity is maintained, but the ability to resolve ambiguities in transponder assignment deteriorates
Solution Approach 1:
The patent enhances the universality of the RFID reading device by integrating position determination capabilities and evaluation units that can handle multiple reading scenarios. The device can operate in both simple and complex modes, providing reliable transponder assignment across different operational contexts without requiring fundamentally different systems, thus maintaining relative simplicity while improving reliability.
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
Enables accurate and efficient assignment of multiple transponders, increasing logistics throughput, reducing costs by eliminating the need for isolation systems, and detecting errors such as misplaced transponders, while providing precise location and speed data for improved tracking.
Implementation Method 1
using phase methods and multiple antennas to resolve ambiguities and improve accuracy
Data Source
Figure 1~2
Figure 3~4
AI summary
An RFID device (10) for communicating with RFID transponders (12, 22, 24) according to an RFID protocol is described. The device comprises an antenna (14), an RFID transceiver (16) for transmitting and receiving RFID signals using the antenna (14), and a control unit (18) configured to encode RFID information into or read it from an RFID signal according to the RFID protocol, and to determine at least one position and/or velocity parameter of an RFID transponder (12, 22, 24) based on the RFID signal. The control unit (18) is further configured to read container transponders (24) and object transponders (22) and to assign an object transponder (22) to a container transponder (24) based on the respective position and/or velocity parameters.