RFID Display Mapping by Coordinate Regions for Dense Worksites
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Solution Overview
Problem
Existing RFID-based systems for managing construction work locations suffer from information congestion and inaccuracies due to high tag density and reliance on self-localization techniques prone to error, leading to reduced visibility and accuracy in displaying item locations.
Innovation Solution
A display control system utilizing a combination of passive RFID tags attached to management targets and fixed position tags, along with a reading apparatus, to estimate positional coordinates and segment the real space into coordinate regions, enabling effective display of management target information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID tags are installed at high density to achieve fine location estimation, then location estimation accuracy is improved, but device complexity and information congestion increase
Solution Approach 1:
The real space is segmented into multiple coordinate regions based on position tag locations. Instead of treating the entire space as one region, the system divides it into manageable segments (e.g., first coordinate region and second coordinate region), allowing location estimation without requiring high-density RFID tags throughout the entire space.
Solution Approach 2:
Position tags are introduced as intermediary devices installed at specific locations to serve as reference points. These position tags mediate between the RFID tags on management targets and the reading apparatus, enabling location estimation through relative position calculations rather than requiring direct high-density RFID tag coverage.
2Device complexity
If self-localization technique is used to reduce tag density, then device complexity is reduced, but measurement precision deteriorates due to accumulated error
Solution Approach 1:
The system uses position tags as fixed reference points to provide feedback for correcting accumulated errors in self-localization. By periodically referencing known position tag locations, the system can reset and correct drift in the self-localization technique, maintaining accuracy without requiring high tag density.
Solution Approach 2:
Position tags are pre-installed at known locations to establish a reference framework before location estimation begins. This preliminary setup creates a coordinate system that guides subsequent location calculations, reducing reliance on continuous high-density RFID tagging and minimizing accumulated error.
3Loss of information
If all management target information is displayed simultaneously, then information completeness is improved, but visibility is reduced due to screen congestion
Solution Approach 1:
The display information is segmented by coordinate regions rather than showing all management targets uniformly. The display control unit divides the information into first management target information (for first coordinate region) and second management target information (for second coordinate region), allowing organized presentation that maintains completeness while improving visibility through spatial grouping.
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
The system provides clear and accurate visualization of management target locations by segmenting the workspace into coordinate regions, reducing information congestion and enhancing positional accuracy through a hybrid approach that minimizes reliance on self-localization errors.
Implementation Method 1
Radio frequency identification (RFID) is a technology that allows information embedded in a small device which is also referred to as a tag to be read by an external reader through a short-range wireless communication
Data Source
AI summary
A display control system includes: first wireless devices respectively attached to management targets in a real space and storing first identification information; second wireless devices installed at respective positions in the real space and storing second identification information; a reading apparatus that can read identification information from a wireless device; an estimation unit that estimates positional coordinates at which each management target is positioned based on results of reading of the first and second identification information by the reading apparatus; and a display control unit. The real space is regularly segmented into coordinate regions. The display control unit causes the display apparatus to display coordinate region information regarding coordinate regions to which positional coordinates estimated for the respective management targets belong.