Noncontact IC Medium Direction Detection via Signal Subtraction
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Solution Overview
Problem
Existing noncontact IC medium direction detection systems, such as those using single-element patch antennas, face challenges in accurately determining the direction of noncontact IC media due to complex calculations and interference from reflective objects, leading to difficulties in precisely locating the medium.
Innovation Solution
A noncontact IC medium direction detecting apparatus that utilizes receiving means capable of reading signals in different directional orientations, with information processing to perform subtraction or division operations on signal levels from multiple directional orientations to determine the existence direction, and adjusts these orientations based on threshold ranges to accurately locate the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complicated calculation methods are used to determine direction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of signal processing by using simple subtraction or division operations on signal levels from different directional orientations, replacing complex calculation methods while maintaining direction detection precision through threshold-based determination
Solution Approach 2:
The patent segments the direction detection process into discrete directional orientations, measuring signal levels at specific angles and comparing them through simple operations to determine the presence and direction of noncontact IC media
2Measurement precision
If conventional direction detection methods are used, then measurement precision is improved, but object-affected harmful factors increase
Solution Approach 1:
The patent converts the harmful effect of reflective objects into a useful indicator by detecting signal level differences caused by reflections. The system uses the reflected signals as additional information to determine direction through simple subtraction or division operations, making the previously harmful reflective interference into a detectable pattern that aids direction determination
3Device complexity
If simple signal processing is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces an intermediary threshold value that mediates between simple signal processing and precise direction detection. By comparing processed signal levels against predetermined thresholds, the system achieves accurate direction determination through simple operations rather than complex calculations
Data Source
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AI summary
A noncontact IC medium direction detecting apparatus (1) includes: receiving means (10) capable of reading a noncontact IC medium (25) in different directional orientations; and information processing means (13) that controls the receiving means, the information processing means being arranged to perform: a first obtaining process of aiming a directional orientation toward a first direction to obtain a signal level of a signal received from the noncontact IC medium having predetermined identification information; a second obtaining process of aiming another directional orientation toward a second direction to obtain a signal level of a signal received from the noncontact IC medium; a composition process of subjecting the signal levels corresponding to the first and second directions to subtraction operation or division to obtain a composite signal level; and an existence direction operating process of obtaining a direction where the noncontact IC medium of interest exists from an operation using the composite signal level. This provides the noncontact IC medium direction detecting apparatus (1) capable of easily obtaining an existence direction of a noncontact IC medium, a method therefor, a program therefor, and a computer-readable recording medium having the program recorded thereon.