RFID Dual-Tag System for Accurate Mobile Object Recognition
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Solution Overview
Problem
Existing RFID systems face challenges in accurately recognizing mobile objects due to false information reading and lengthy processing times, especially in high-speed applications, where passive or semi-passive RFID tags respond to radio waves from multiple antennas, leading to signal interference and complex filtering processes.
Innovation Solution
The implementation of a dual-tag system with a mobile RFID tag and a fixed RFID tag, where the fixed tag adjusts its signal reflection intensity to bury or dominate the signal from the mobile tag based on expected communication locations, allowing only the relevant information to be read by the antenna, thereby simplifying the recognition process and reducing processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple antennas transmit read commands simultaneously to detect mobile objects, then the recognition coverage is improved, but false information is read due to signal interference from tags responding to multiple antennas
Solution Approach 1:
The system divides the recognition space into multiple zones, each associated with a specific antenna. By segmenting the coverage area and assigning each zone to a dedicated antenna, the system prevents tags from being read by multiple antennas simultaneously, thereby eliminating false information while maintaining comprehensive coverage.
Solution Approach 2:
A signal strength threshold acts as an intermediary criterion to determine which antenna's read command a tag responds to. The threshold mediates between multiple antennas by selecting only the strongest signal, ensuring that each tag is correctly attributed to the antenna in its actual location zone, thus preventing false readings.
2Measurement precision
If filtering processes are applied to remove false information from multiple tag responses, then information accuracy is improved, but processing time is significantly lengthened
Solution Approach 1:
The system performs preliminary actions by pre-defining recognition zones and signal strength thresholds before actual detection occurs. This pre-configuration eliminates the need for complex real-time filtering processes, as the correct tag identification is determined upfront based on which antenna's read command the tag responds to, thus maintaining high accuracy without time loss.
3Measurement precision
If sequential transmission of read commands from multiple antennas is used, then false information reading is prevented, but recognition efficiency and speed are reduced
Solution Approach 1:
The system employs periodic action by having multiple antennas transmit read commands in alternating cycles rather than strictly sequentially. Each antenna transmits during its designated time slot, and tags respond based on signal strength thresholds. This periodic transmission pattern maintains information accuracy by preventing simultaneous interference while improving efficiency compared to strict sequential transmission.
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 approach ensures accurate and efficient recognition of mobile objects by stabilizing signal reading, preventing false information from being read, and significantly shortening processing time, making it suitable for high-speed applications.
Implementation Method 1
the fixed tag adjusts its signal reflection intensity to bury or dominate the signal from the mobile tag
Data Source
AI summary
An antenna is disposed near a route of mobile object. A fixed tag is disposed at a location where a radio wave can be received from the antenna. When receiving a read command from the antenna, a mobile tag attached to the mobile object and the fixed tag send back a response signal at prescribed timing. A signal received from the fixed tag by the antenna is substantially constant. The signal from the fixed tag cannot be read while buried in a signal transmitted from the mobile tag to the antenna while the mobile tag is positioned at a location where communication with the antenna is expected. Conversely, when the mobile tag is at least a prescribed distance away from the antenna, the signal from the mobile tag cannot be read while buried in the signal from the fixed tag.