RFID Reader Localization via Transmission Power Level Search
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Solution Overview
Problem
Existing RFID object localization systems face challenges in accurately and rapidly determining object location due to variable RFID tag sensitivity, RF interference, and environmental factors, often requiring complex and costly additional sensors.
Innovation Solution
The method involves searching for a target using multiple RFID reader transmission power levels to determine a measurement power level that correlates to the distance between the RFID reader and the object, allowing for accurate localization without additional sensors or extensive environmental modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors (light, optical, tactile) are added to RFID systems for object localization, then localization accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for additional sensors by using only the RFID reader's existing transmission capabilities. By removing cameras, vision sensors, laser, infrared, ultrasonic, and range-finding devices, the system achieves localization using solely RFID transmission power level variations, thus reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The RFID reader performs localization functions using its own transmission power levels without requiring external sensors or辅助设备. The system uses the RFID reader's inherent capability to vary transmission power and measure tag responses to determine distance and location, making the RFID reader self-sufficient for localization tasks.
2Difficulty of detecting and measuring
If transmission power levels are increased to improve detection range, then detection capability is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts transmission power levels based on detection needs. The RFID reader varies transmission power through multiple levels (e.g., 0 dBm, -10 dBm, -20 dBm, -30 dBm) to optimize detection capability while minimizing energy consumption. By using the minimum necessary power to detect tags at different distances, the system achieves effective detection without excessive energy use.
Solution Approach 2:
The patent changes the transmission power parameter to achieve detection at different distances. By modifying the power level parameter dynamically, the system can detect tags whether they are close or far, optimizing both detection capability and energy efficiency without requiring constant high-power transmission.
3Measurement precision
If multiple transmission power levels are searched to determine measurement power level, then localization accuracy is improved, but time consumption increases
Solution Approach 1:
The system performs preliminary calibration by searching through multiple transmission power levels to establish the relationship between power levels and tag response characteristics. This preliminary action creates a lookup table or calibration data that enables faster localization during actual operation, trading initial time investment for improved speed and accuracy in subsequent measurements.
Solution Approach 2:
The patent uses periodic scanning through different transmission power levels to find the optimal measurement power level. By systematically cycling through power levels (e.g., starting at 0 dBm and decreasing to -30 dBm), the system identifies the power level that provides the best signal-to-noise ratio for distance estimation, balancing accuracy with reasonable time consumption.
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
This approach enables quick, accurate, and cost-effective object localization by calibrating transmission power levels based on reference locations, improving localization speed and accuracy without adding complexity or cost.
Implementation Method 1
RFID readers are generally designed and installed so as to cover a specified physical area... RFID readers transmit at different power levels... to determine a measurement power level corresponding to a target
Implementation Method 2
RFID tags receiving an interrogatory signal from an RFID reader will respond with information that can be used to uniquely identify the RFID tag
Data Source
AI summary
Object localization with an radio-frequency identification (RFID) infrastructure is described. A plurality of transmission power levels established by an RFID reader can be searched to determine a measurement power level corresponding to a target. A region that includes the target can then be determined using information about a physical relationship between the RFID reader and a reference location via correlating the measurement power level to a reference power level corresponding to the reference location.