Moving Antenna RFID Reader Position Accuracy
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Solution Overview
Problem
Existing wireless tag reading technologies face challenges in accurately determining the position of RFID tags due to varying RSSI and phase values influenced by distance and ambient environments, such as reflectors and scatterers, leading to difficulties in correctly identifying tags in predetermined areas.
Innovation Solution
A wireless tag reading apparatus with a moving antenna mechanism and a controller that adjusts radio wave information based on tag data, using position estimation models to determine the tag's position and reliability, and notifies users of potential errors in readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RSSI and phase values are used to determine tag position, then the reading process is simple, but the determination accuracy deteriorates due to environmental influences
Solution Approach 1:
The system performs preliminary actions by moving the antenna to multiple predetermined positions before final determination, collecting RSSI and phase data at each position. This preliminary data collection across multiple positions enables more accurate tag position determination while accounting for environmental factors like reflectors and scatterers.
Solution Approach 2:
The invention transitions from single-position reading to multi-position reading by adding the spatial dimension of antenna movement. The antenna moves along the vertical direction to multiple positions, creating a three-dimensional reading space that provides more information for accurate tag position determination and environmental factor compensation.
2Productivity
If a fixed antenna position is used, then the reading process is fast, but the reliability deteriorates due to varying radio wave environments
Solution Approach 1:
The system performs preliminary readings at multiple antenna positions before making the final determination. This preliminary action at multiple positions provides redundant information that increases reliability, allowing the system to identify and compensate for environmental factors like reflectors and scatterers that affect radio wave propagation.
Solution Approach 2:
The system uses feedback from multiple reading positions to improve reliability. By comparing RSSI and phase data from different antenna positions, the system can detect inconsistencies caused by environmental factors and adjust its determination accordingly, ensuring more reliable tag identification.
3Measurement precision
If multiple antenna positions are used for reading, then the position determination accuracy is improved, but the reading time increases
Solution Approach 1:
The system performs preliminary readings at multiple predetermined antenna positions along the vertical direction. These preliminary actions collect necessary data efficiently, enabling accurate tag position determination through subsequent processing of the multi-position data, including compensation for environmental factors.
Solution Approach 2:
The system changes the antenna position parameter vertically to multiple predetermined positions. This parameter change enables the collection of diverse radio wave data from different spatial locations, improving position determination accuracy while the predetermined nature of these positions optimizes the reading process efficiency.
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
Improves the accuracy of RFID tag position determination by compensating for environmental influences and user confirmation, reducing erroneous readings and enhancing the reliability of tag identification.
Implementation Method 1
upon receipt of a radio wave from a wireless tag via the antenna at each of the multiple positions
Data Source
AI summary
A wireless tag reading apparatus includes an antenna, a driving mechanism configured to move the antenna to multiple positions, and a controller configured to: upon receipt of a radio wave from a wireless tag via the antenna at each of the multiple positions, obtain tag information stored in the wireless tag and radio wave information related to the radio wave, adjust the radio wave information based on the tag information, and determine whether the wireless tag is a reading target based on information indicating a position of the wireless tag that is output from a model in response to an input of the adjusted radio wave information.