RFID Personnel Tracking in Structures Using Segmented Tags
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Solution Overview
Problem
Current emergency response systems lack the ability to rapidly and accurately locate individual first-responder personnel within structures, especially in three-dimensional environments like high-rise buildings and underground areas, due to limitations in GPS and cell phone-based solutions, which are not reliable in metropolitan areas or during power outages.
Innovation Solution
An RFID system is implemented using portable RF transmitter/receivers worn by personnel and passive or active RFID tags placed at intervals within structures, allowing for real-time location tracking by emitting and receiving RF signals, with data broadcasted to a base unit for logging and display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS technology is used to locate personnel, then location tracking capability is provided, but accuracy is insufficient in high-rise buildings and underground areas
Solution Approach 1:
The patent divides the location tracking system into multiple independent components: portable transponders worn by personnel and stationary RFID tags placed throughout the structure. This segmentation allows the system to overcome GPS limitations by creating a localized tracking network that works independently of satellite signals, achieving accurate location tracking in high-rise buildings and underground areas where GPS fails
Solution Approach 2:
The patent introduces RFID tags as intermediary elements placed throughout the structure to facilitate location tracking. These tags act as mediators between the portable transponders and the base unit, enabling communication and location determination in environments where direct GPS reception is blocked by building structures or underground conditions
2Reliability
If cell phone-based systems are used to locate personnel, then location tracking is enabled, but signal loss occurs in buildings and underground areas
Solution Approach 1:
The patent replaces the cell phone communication system with an RFID-based electromagnetic field system. Instead of relying on cellular radio signals that are blocked by buildings and underground structures, the system uses low-frequency electromagnetic fields from portable transponders and stationary tags, which can penetrate structures and provide reliable communication without signal loss or interference
Solution Approach 2:
The portable transponders continuously emit identification signals and automatically update their location by detecting nearby RFID tags, eliminating the need for external cell tower infrastructure. The system serves itself by using the structure's own architecture (with placed tags) to enable tracking, making it independent of external communication networks that are vulnerable to signal loss
3Adaptability or versatility
If GPS and cell phone systems are used, then location tracking is provided, but system autonomy is reduced due to dependence on power grid
Solution Approach 1:
The portable transponders use periodic activation of RF signals rather than continuous transmission, conserving battery power while maintaining tracking capability. The transponders are activated at intervals or in response to detection events, allowing the system to operate autonomously for extended periods without external power, making it suitable for emergency response scenarios where power grid dependency is unacceptable
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 solution enables accurate and rapid location tracking of personnel within structures, reducing costs by minimizing the need for extensive infrastructure and ensuring functionality during power outages, with potential for widespread adoption in buildings and emergency scenarios.
Implementation Method 1
emitting an RF interrogation signal at constant, predetermined intervals
Implementation Method 2
powering up and emitting a signal containing location data
Data Source
AI summary
The present invention provides method for locating an entity within a structure using RFID system including a portable RF transmitter/receiver transported by the entity within the structure, a base unit, and a plurality of RFID tags, the method comprising the steps of: (a) emitting an RF interrogation signal at constant, predetermined intervals; (b) powering up and emitting a signal containing location data; (c) receiving the location data and broadcasting the location data to the base unit; and (d) receiving and displaying the location data; wherein steps (a) and (c) are performed by the RF transmitter/receiver, step (b) is performed by an RFID tag when the RF interrogation signal is within an effective range of the RFID tag, and step (d) is performed by the base unit.