RFID Reader Calibration Using Orientation Identifiers
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Solution Overview
Problem
Current RFID systems face challenges in accurately calibrating RFID readers and estimating the location of RFID tags due to orientation and positioning errors, which affect the precision of tracking and inventory management in various environments.
Innovation Solution
The implementation of an RFID reader calibration system that includes a primary identifier and a plurality of secondary identifiers, along with a data capture device and a locationing server, which determine the location and orientation of the RFID readers by capturing coordinates and generating calibration data to compensate for orientation differences, ensuring accurate positioning and orientation of RFID readers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID readers are deployed for tracking items, then tracking capability is improved, but location estimation accuracy deteriorates due to orientation and positioning errors
Solution Approach 1:
The patent changes the parameters of the RFID reader system by adding orientation identifiers (primary and secondary) that provide angular information. This allows the system to account for reader orientation when estimating tag locations, transforming the location calculation from a simple distance-based model to one that incorporates both position and orientation parameters, thereby improving measurement precision without sacrificing tracking capability
Solution Approach 2:
The patent introduces orientation identifiers as intermediary elements between the RFID reader and the location estimation process. These identifiers (primary identifier on the first surface and secondary identifiers on the second surface) serve as mediators that capture orientation information, which is then used by the locationing server to compensate for orientation differences and improve location estimation accuracy
2Area of stationary object
If RFID readers are suspended from ceiling, then coverage area is improved, but orientation determination becomes more complex
Solution Approach 1:
The patent segments the orientation determination task by using multiple separate identifiers (one primary identifier and multiple secondary identifiers) positioned at different locations on the reader housing. This segmentation allows the system to determine orientation through the relative positions of these identifiers rather than requiring a single complex orientation sensor, simplifying the overall determination process while maintaining accuracy
Solution Approach 2:
The patent replaces complex mechanical orientation sensors with a simpler optical/measurement-based system. Instead of using gyroscopes or other mechanical orientation detection devices, the system uses identifiers that can be visually or optically detected to determine orientation, substituting a complex mechanical system with a simpler measurement approach
Data Source
AI summary
A radio frequency (RF) identification (RFID) reader calibration system for use with a venue includes an RFID reader having a primary identifier and a plurality of secondary identifiers. The primary identifier and each of the plurality of secondary identifiers having a respective unobstructed line of sight to a point on the floor of the venue. The RFID reader calibration system also includes a data capture device configured to be aimed at the primary identifier and the plurality of secondary identifiers and to capture respective coordinates of the primary identifier and each of the plurality of secondary identifiers. The RFID reader calibration system also includes a controller configured to determine: a location of the RFID reader based on the coordinates of the primary identifier; and an orientation of the RFID reader based on the respective coordinates of the primary identifier and each of the plurality of secondary identifiers.