Reverse RFID Indoor Positioning via Embedded Tag Data
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Solution Overview
Problem
Global navigational satellite system (GNSS) receivers are ineffective indoors and in areas with obstructed satellite views, necessitating alternative navigation systems for environments like office buildings, warehouses, and shopping malls.
Innovation Solution
A reverse RFID location system utilizing fixed RFID tags with embedded position data and vectors, allowing mobile RFID readers to determine their location through weighted averages of nearby tag positions, without requiring communication with a database, and integrating with GNSS for seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverse RFID location systems use a database of RFID tag data, then location information can be provided, but communication requirements and system complexity increase
Solution Approach 1:
The patent extracts location information directly from RFID tags themselves rather than retrieving it from an external database. Each RFID tag contains its own location data, allowing the system to function independently of centralized database communication infrastructure.
Solution Approach 2:
RFID tags are designed to be self-contained with embedded location information, enabling them to provide location data autonomously without requiring external database queries. This self-service approach reduces system complexity and eliminates communication dependencies.
2Adaptability or versatility
If GNSS receivers are used for navigation, then outdoor positioning is achieved, but indoor positioning capability is lost
Solution Approach 1:
Instead of using satellite-based GNSS receivers that work outdoors, the patent inverts the approach by using ground-based RFID tags that work indoors. The system replaces sky-based navigation with earth-based navigation, adapting the positioning methodology to the specific environment.
Solution Approach 2:
The patent changes the fundamental parameter of signal source from satellite-based (GNSS) to ground-based (RFID tags). This parameter change enables positioning functionality to transition from outdoor satellite signal dependency to indoor local tag-based positioning.
Data Source
AI summary
A reverse RFID location system is based on set of RFID tags in which each tag stores data representing its position.