Chipless RFID Pattern Detection Under Unknown Relative Velocity
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Solution Overview
Problem
The challenge of estimating a pattern on a chipless RFID tag using SAR imaging technology arises when the relative velocity between the tag and the radar device is unknown.
Innovation Solution
A detecting system and apparatus that includes a tag with known and unknown patterns, a radar device, and a detecting apparatus to calculate the relative velocity and specify conditions for transmitting radio waves to estimate the unknown pattern, utilizing SAR imaging technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SAR imaging technology is used to estimate the pattern on the chipless RFID tag, then the pattern can be identified with high resolution, but the relative velocity between the tag and radar device must be known
Solution Approach 1:
The system performs preliminary action by transmitting radio waves at multiple different frequencies before pattern estimation. This preliminary frequency sweep allows the system to gather reflection characteristics at various frequencies, from which the relative velocity can be derived without requiring direct velocity measurement equipment.
Solution Approach 2:
The system changes the frequency parameter of the transmitted radio waves across multiple frequencies. By analyzing how the reflection characteristics vary with frequency, the system can calculate the relative velocity between the tag and radar device, thereby eliminating the need for separate velocity measurement while maintaining SAR imaging capability.
2Reliability
If the relative velocity is unknown, then the system cannot estimate the pattern using SAR imaging, but adding velocity measurement equipment increases system complexity
Solution Approach 1:
The system serves itself by using its own radio wave transmission and reception capability to derive the relative velocity information. Instead of requiring external velocity measurement equipment, the system processes the reflection characteristics of its own transmitted signals to calculate velocity, thereby maintaining reliability without increasing device complexity.
Solution Approach 2:
The system uses feedback from the reflection characteristics of transmitted radio waves at multiple frequencies to determine the relative velocity. This feedback mechanism allows the system to automatically adjust and obtain velocity information needed for accurate pattern estimation without additional measurement devices.
3Ease of operation
If radio waves are transmitted at a single frequency, then the system is simpler to operate, but the unknown pattern cannot be accurately estimated
Solution Approach 1:
The system implements periodic action by transmitting radio waves at multiple different frequencies in sequence. This periodic frequency variation allows the system to gather sufficient information for both velocity calculation and pattern estimation, achieving high measurement precision while maintaining ease of operation through automated multi-frequency scanning.
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
Enables the estimation of patterns on chipless RFID tags even when the relative velocity is unknown, allowing for accurate identification and measurement of environments such as ocean currents and river flows at low cost and low environmental impact.
Implementation Method 1
a radar device that transmits transmission radio waves to the tag and acquires reception radio waves produced by the transmission radio waves being reflected by the tag
Implementation Method 2
The pattern is made of a plurality of materials that reflect or scatter transmission radio waves emitted by a radar device
Implementation Method 3
When the pattern included on the chipless RFID is estimated, a relative velocity between the chipless RFID tag and the radar device is referred to
Data Source
AI summary
A detecting system includes a tag, a radar device that transmits transmission radio waves to the tag and acquires reception radio waves produced by the transmission radio waves being reflected by the tag, and a detecting apparatus. The tag includes a pattern made of a plurality of materials that reflect or scatter radio waves received from the radar device, and the pattern includes a known pattern known to the detecting apparatus and an unknown pattern unknown to the detecting apparatus. The detecting apparatus includes a specifying unit that calculates a relative velocity between the radar device and the tag, with which the known pattern can be detected from the reception radio waves, and specifies a condition for the radar device to transmit transmission radio waves for estimating the unknown pattern, from the calculated relative velocity, and a notification unit that notifies the radar device of the specified condition.