Movable Antenna Wireless Tag Reader with Camera Movement Detection
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Solution Overview
Problem
Wireless tag reading apparatuses face challenges in accurately reading information from tags attached to items when the items or baskets move, and changes in the radio wave environment can affect reading results.
Innovation Solution
A wireless tag reading apparatus with movable antennas, a camera for object detection, and a controller that captures images and determines if the object has moved during the reading period, issuing a notification if movement is detected, and using RSSI and phase values to estimate the tag's position and ensure reliable data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless tag reading apparatus uses a fixed antenna position to simplify the device structure, then the device complexity is reduced, but the reading reliability deteriorates when the item or basket moves during the reading process
Solution Approach 1:
The patent applies the dynamics principle by making the antenna movable instead of fixed. The antenna can move between a first position and a second position during the tag reading process. This dynamic configuration allows the antenna to adapt to item movement and maintain reliable reading by adjusting its position to optimize radio wave reception, thereby resolving the contradiction between reading reliability and device complexity.
Solution Approach 2:
The patent implements feedback through a camera that captures images of the item during the reading process. The controller analyzes these images to detect whether the item has moved. Based on this feedback information, the controller can control the antenna to move to different positions to maintain optimal reading conditions, thus improving reading reliability without significantly increasing device complexity.
2Measurement precision
If the antenna remains stationary during the reading process to reduce device complexity, then the device complexity is reduced, but the reading precision deteriorates when external factors like item movement or radio wave environment changes occur
Solution Approach 1:
The antenna is designed to be movable between different positions during the reading process. This dynamic capability allows the antenna to adjust its position to maintain optimal reading precision even when the item moves or when radio wave environment changes occur, thereby improving measurement precision without requiring overly complex fixed-position systems.
Solution Approach 2:
The camera-based detection system provides real-time feedback on item position and movement. The controller uses this feedback to dynamically adjust the antenna position, ensuring that reading precision is maintained despite external factors such as item movement or changes in the radio wave environment.
3Reliability
If the apparatus adds a camera and movable antenna to detect and respond to item movement, then the reading reliability is improved, but the device complexity increases
Solution Approach 1:
The camera serves multiple functions: it captures images for item identification and simultaneously detects item movement during the reading process. This multi-functionality reduces the need for separate detection devices, thereby limiting the increase in device complexity while still improving reading reliability through movement detection and antenna position adjustment.
Solution Approach 2:
The camera provides feedback on item position and movement, which the controller uses to dynamically adjust the antenna position. This feedback mechanism enables the system to maintain high reading reliability by adapting to item movement without requiring excessively complex additional hardware.
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 apparatus provides reliable tag information acquisition and alerts users to potential reading errors due to movement, ensuring accurate data capture and user notification for re-reading when external factors affect the reading process.
Implementation Method 1
control the antennas to transmit radio waves to a wireless tag and move the antennas, wherein the transmitting and the moving are repeated while the antennas move from the first position to the second position during a tag reading period, acquire tag information from response waves transmitted by the wireless tag in response to the radio waves
Data Source
AI summary
A wireless tag reading apparatus for reading tag information stored in a wireless tag attached to an item, includes a stage on which the item can be placed, one or more antennas movable between first and second positions, a camera facing the stage, and a controller configured to control the camera to capture images and detect an object therein, control the antennas to transmit radio waves to a wireless tag and move the antennas, wherein the transmitting and the moving are repeated while the antennas move from the first position to the second position during a tag reading period, acquire tag information from response waves transmitted by the wireless tag in response to the radio waves, based on the captured images, determine whether the object has moved during the tag reading period, and upon determining that the object has moved during the tag reading period, issue a notification.