Wireless Tag Phase Comparison for Area Verification
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Solution Overview
Problem
Existing communication devices struggle to accurately determine whether a wireless tag is within a predetermined area due to phase changes caused by distance and environmental factors, leading to potential erroneous identification of commodities.
Innovation Solution
A communication device equipped with an antenna, reception unit, and determination unit that uses phase differences between signals from a reference tag and a reading target tag to validate the location of the target tag within a predetermined area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase measurement is used to determine wireless tag location, then location verification capability is improved, but measurement precision deteriorates due to phase changes caused by distance and environmental factors
Solution Approach 1:
The patent introduces a reference tag as an intermediary element to mediate the phase measurement process. By comparing the phase of signals from the reading target tag against the phase of signals from the reference tag (whose position is known), the system can determine whether the target tag is within the predetermined area. This intermediary reference tag allows location verification while compensating for environmental factors and distance variations that would otherwise degrade measurement precision.
2Productivity
If wireless communication is established with any detected tag, then reading speed is improved, but reliability deteriorates due to erroneous identification of tags outside the predetermined area
Solution Approach 1:
The patent applies preliminary action by performing phase-based location verification before finalizing the reading of the wireless tag. The determination unit checks whether the target tag is within the predetermined area by comparing phase differences before the tag is registered as valid. This preliminary verification step prevents erroneous identification of tags outside the area while maintaining efficient reading operations for tags that pass the verification.
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
Prevents the reading of wireless tags not guaranteed to be within the predetermined area as valid, ensuring accurate identification of commodities and preventing erroneous registration.
Implementation Method 1
an antenna 10, a reception unit 34, and a determination unit 41. The reception unit 34 uses the antenna 10 to sequentially receive signals wirelessly transmitted from a reference tag
Data Source
AI summary
A commodity registration system includes a non-transitory computer-readable medium having instructions stored thereon. The instructions, when executed by one or more processors, cause the one or more processors to acquire a plurality of reference signals via an antenna at a plurality of positions between a first position and a second position, acquire a plurality of target signals via the antenna at a plurality of positions between the first position and the second position, and refrain from registering the commodity for purchase based on a comparison between a reference phase characteristic of the plurality of reference signals and a target phase characteristic of the plurality of target signals.