Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

A Precise Phase Calculation Method Based on RFID Multipath Estimation

A kind of phase calculation and phase technology, which is applied in the direction of calculation, computer parts, cooperative operation devices, etc., to achieve the effect of low error and improved practicability

Active Publication Date: 2019-05-03
XI AN JIAOTONG UNIV
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the prior art methods have more or less problems in practicability, actual deployment, accuracy, and other aspects

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Precise Phase Calculation Method Based on RFID Multipath Estimation
  • A Precise Phase Calculation Method Based on RFID Multipath Estimation
  • A Precise Phase Calculation Method Based on RFID Multipath Estimation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0062] The present invention will be further explained below in conjunction with specific embodiments and accompanying drawings.

[0063] see figure 1 , the present invention is divided into two parts, the first part is to model the relationship between the mixed phase β and the pure phase θ; the second part is to calculate the pure phase θ from the already constructed model. The main steps are as follows:

[0064] 1) Collect target tag phase data: the reader antenna faces the target tag, collects data for 5 seconds in each channel, traverses N channels, and N needs to be greater than or equal to 3. During the RFID communication process, the reader receives a series of signals The superposition of radio frequency signals mainly includes: the diameter line-of-sight signal and the signal reflected by the environment. In practice, the reflection is uncontrollable, which will bring a random error α to the final receiving phase β. Since the signals are aliased with each other, thu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a precise phase calculation method based on RFID multi-path estimation. The internal relationship of receiving phases among multiple channels is found out; and furthermore, the proportion of multi-path effect influence in receiving phase data is evaluated. Because of unknown multi-path effect influence, radio-frequency offset of RFID hardware, movement of people and some uncontrollable factors, a real phase value cannot be obtained; therefore, the influence is evaluated by measurement of the dispersion degree of the receiving phases; and thus, a real possible phase value is extrapolated. According to the precise phase calculation method based on RFID multi-path estimation disclosed by the invention, no special requirement on hardware exists; the existing commercial agreement also does not need to be modified; and the precise phase calculation method disclosed by the invention completely supports that a relatively precise phase value is obtained from the existing system, even in an indoor environment where multiple paths generally exist.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification (RFID), in particular to an accurate phase calculation method based on RFID multipath estimation. Background technique [0002] Radio frequency identification technology (RFID) is ubiquitous in many applications such as retail, supermarket, logistics, warehousing and so on. In recent years, many researchers have paid attention to RFID applications, such as positioning, human body active perception, trajectory tracking and so on. In these applications, phase values ​​are highly regarded and useful. Because the phase can reflect the change of fine-grained label position. For tagged moving objects, their continuous phase values ​​can be used to track trajectories. Similarly, in recent years, the multipath effect ubiquitous in indoor environments has attracted the attention of a large number of researchers. For example, some studies have estimated static reflection sources, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/10G06K17/00
CPCG06K7/10069G06K7/10099G06K7/10356G06K17/0025
Inventor 韩劲松王鸽韩凯丁菡杨玉芹
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com