RFID Assignment via Signal Time Focus and Dynamic Range
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Solution Overview
Problem
Existing methods for determining the location of contactless data carriers, such as RF-ID tags, within multiple spatially moving areas are inefficient due to interference from neighboring containers and limitations in reading range, leading to reduced throughput and incorrect assignments.
Innovation Solution
A method that involves detecting the time and signal strength of response signals from data carriers as they move within the reading range, using the centroid of time and signal energy to accurately assign them to specific areas, while minimizing the impact of reflections and allowing for larger reading ranges and closer container spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reading range of the reader is reduced to read data carriers from only one container, then the assignment accuracy is improved, but the throughput and utilization of the means of transport decrease
Solution Approach 1:
The system dynamically adjusts the reading range of the reader to match the actual distance to the container. The control device receives distance information from the distance measuring device and dynamically modifies the reading range parameter, allowing the system to operate with larger reading ranges when containers are far apart while maintaining accurate assignment, thus resolving the contradiction between assignment accuracy and throughput.
2Measurement precision
If the containers are placed sufficiently far apart from each other, then the assignment accuracy is improved, but the throughput and utilization of the means of transport decrease
Solution Approach 1:
The system performs preliminary distance measurement between the reader and container before the actual data carrier reading process. The control device uses this pre-acquired distance information to proactively adjust the reading range, ensuring optimal reading conditions are established in advance, which enables accurate assignment without requiring excessive spacing between containers.
3Productivity
If reading devices with large reading ranges are used, then the throughput is improved, but data carriers from neighboring containers can be read causing incorrect assignments
Solution Approach 1:
The system implements a feedback mechanism where the distance measuring device continuously provides distance information to the control device, which then adjusts the reading range accordingly. This closed-loop control ensures that even with large reading range capabilities, the actual reading range is precisely controlled to match the container distance, preventing reading of data carriers from neighboring containers while maintaining high throughput.
4Productivity
If the reading range is increased, then more data carriers can be queried simultaneously improving throughput, but random reflections cause data carriers from distant containers to be read
Solution Approach 1:
The system changes the reading range parameter dynamically based on the measured distance to the container. By adjusting this critical parameter according to actual conditions rather than using a fixed large reading range, the system can query more data carriers simultaneously when appropriate while filtering out spurious signals from distant containers through reflections, thus improving both throughput and assignment 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
This method enables precise assignment of data carriers to their respective areas, improving accuracy and throughput by distinguishing signal strengths and eliminating interference, thus allowing for more efficient use of reading devices and container arrangements.
Implementation Method 1
a read signal is generated with a signal strength. The method has the steps: detecting a respective area time when an area is in the vicinity of the reader, at least one readout of the data carrier
Implementation Method 2
this procedure does not solve the problem of random reflections during queries, which means that data carriers can also be read from distant containers
Data Source
Figure 1~2
Figure 3
AI summary
The method involves determining a respective region point (Bi), when a region (B) is arranged in the proximity of the reader (L), and selecting a data medium (D). The times (ti) and signal strengths (Pi) of the response signals of the data medium are determined. The temporal focal point (S) of the response signals of the data medium is determined. The data medium is assigned to the region, whose region point lies next to the temporal focal point of the response signals of the data medium in a temporal manner. An independent claim is also included for a device for assigning a contactless readable data medium to a region.