UHF RFID Path Loss Model for Vehicle-Loading Warehousing
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Solution Overview
Problem
Current asset management systems for vehicle-loading warehousing using UHF RFID face inefficiencies due to the complex propagation of electromagnetic waves, including direct, refractive, diffractive, and scattered waves, which affect the accuracy and efficiency of tag identification, especially with obstacles like vehicle hoods and ground surfaces.
Innovation Solution
A method and system that construct a UHF RFID path loss model incorporating height difference and obstacle loss factors to optimize the wireless sensing path by considering direct, refractive, diffractive, and scattered electromagnetic waves, allowing for the calculation of optimal tag locations and improving inventory efficiency through accurate supply information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional RFID identification system is used in vehicle-loading warehousing, then the system is simple to implement, but the tag identification accuracy and efficiency deteriorate due to complex electromagnetic wave propagation and obstacles
Solution Approach 1:
The patent changes the parameters of the RFID system by introducing a comprehensive path loss model that accounts for height difference and obstacle factors. The model calculates path loss using parameters such as antenna heights (H1, H2), horizontal distance (d), and obstacle loss factors (K1, K2, K3) to accurately predict signal strength in vehicle-loading environments.
Solution Approach 2:
The patent introduces an intermediary path loss calculation system that mediates between the RFID tags and readers. This intermediary model processes electromagnetic wave propagation characteristics through multiple paths (direct, ground reflection, hood diffraction) to determine optimal tag placement and improve identification accuracy.
2Productivity
If multiple electromagnetic wave paths are considered in the path loss model, then the identification efficiency improves, but the calculation complexity increases
Solution Approach 1:
The patent segments the electromagnetic wave propagation into distinct paths: direct path, ground reflection path, and hood diffraction path. Each path is calculated separately with its own transfer function (G1, G2, G3), allowing the system to comprehensively evaluate signal strength while maintaining organized computation.
3Reliability
If obstacles such as vehicle hoods and ground surfaces are included in the model, then the realism and accuracy improve, but the model complexity increases
Solution Approach 1:
The patent applies local quality by introducing specific obstacle loss factors (K1, K2, K3) that account for different obstacle characteristics: vehicle hood material properties, ground surface conditions, and their respective positions. This allows the model to accurately represent local obstacle effects without requiring a complete redesign of the entire path loss calculation framework.
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 method enhances the accuracy and efficiency of UHF RFID tag identification by optimizing the path loss model, enabling dynamic management and automatic identification of assets, improving inventory efficiency and ensuring rapid transmission of supply information in vehicle-loading warehousing scenarios.
Implementation Method 1
An electromagnetic wave is emitted by a tag reader. The electromagnetic wave is diffracted, reflected, and scattered when passing through a warehousing vehicle hood
Implementation Method 2
The electromagnetic wave is diffracted, reflected, and scattered when passing through a warehousing vehicle hood
Implementation Method 3
The electromagnetic wave is diffracted, reflected, and scattered when passing through a warehousing vehicle hood
Implementation Method 4
A UHF RFID tag attached to a front surface location region of assets loaded by a warehousing vehicle receives an electromagnetic wave of a direct path and electromagnetic waves of a ground reflection path, a ground scattering path, a hood diffraction path, a hood reflection path, and a hood scattering path emitted by the tag reader
Data Source
AI summary
A method for vehicle-loading warehousing asset management based on an ultra-high frequency (UHF) radio frequency identification (RFID) path loss model, which includes the following steps. An electromagnetic wave is emitted by a tag reader. The electromagnetic wave is diffracted, reflected, and scattered when passing through a warehousing vehicle hood, and the electromagnetic wave is emitted and scattered through the ground. A UHF RFID tag attached to a front surface location region of assets receives electromagnetic waves of various paths emitted by the tag reader. The tag reader reads UHF RFID tag information. A transfer function of a tag receiving signal is constructed according to the tag information, and a path loss function during a UHF RFID tag sensing electromagnetic wave process is constructed according to the transfer function. The path loss is calculated according to the constructed path loss function. A location of the UHF RFID tag is obtained.