Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Surface acoustic wave positioning system and method fusing intensity and phase information

A technology of surface acoustic wave and phase information, which is used in radio wave measurement systems, positioning, and re-radiation of sound waves to achieve the effects of improving positioning accuracy, low system cost, and eliminating temperature effects.

Active Publication Date: 2020-12-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the existing surface acoustic wave positioning technology, the present invention proposes a surface acoustic wave positioning system and positioning method that integrates intensity and phase information. The reader is connected to three reader antennas through a one-to-three switch. First, set fingerprint points offline and build a fingerprint library according to the sub-areas in the positioning area where there is no phase ambiguity problem. Then use the fingerprint positioning algorithm to determine the sub-area where the positioning target is located. Finally Obtain the precise two-dimensional coordinates of the positioning target through the trilateral positioning algorithm

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
  • Surface acoustic wave positioning system and method fusing intensity and phase information
  • Surface acoustic wave positioning system and method fusing intensity and phase information
  • Surface acoustic wave positioning system and method fusing intensity and phase information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] Please refer to figure 1 As shown, the surface acoustic wave tag is a dual-frequency dual-channel single-ended delay line structure, including a piezoelectric substrate, a first interdigital transducer, a second interdigital transducer, a first reflective grating, a second reflective grating, Tag antenna; wherein, the first interdigital transducer and the first reflection grid are deposited on the upper half of the piezoelectric substrate to form the first propagation channel of the surface acoustic wave, and the second interdigital transducer and the second reflection grid are deposited on the The lower half of the piezoelectric substrate constitutes the second propagation channel of the surface acoustic wave. The apertures of the interdigital transducer and the reflection grid of the two propagation channels are equal, but the two propagation channels do not o...

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 surface acoustic wave positioning system and method fusing intensity and phase information. The surface acoustic wave label is of a double-frequency double-channel structure,and the center distance from the reflecting gratings of the two propagation channels to the interdigital transducer is inversely proportional to the center frequency of the interdigital transducer. The reader is connected with three reader antennas through a one-to-three switch, and the three reader antennas are respectively located at three fixed positions. Before system positioning, a positioning area is divided into a plurality of sub-areas without a phase ambiguity problem, fingerprint points are arranged in geometric centroids of the sub-areas to establish a fingerprint library, the characteristic value of each fingerprint point comprises 12 characteristic values including echo signal intensity and phase, and then the sub-area where a positioning target is located is determined by adopting a fingerprint positioning algorithm. And finally, the unambiguous phase difference of the echo signal is taken as distance measurement information, and thus obtaining a two-dimensional coordinate of the positioning target through a trilateral positioning algorithm. The invention has the characteristics of high positioning precision and low system cost, and not only solves the problem of phase ambiguity, but also eliminates the temperature influence.

Description

Technical field: [0001] The invention relates to a surface acoustic wave positioning system and a positioning method that integrates intensity and phase information, and belongs to the field of radio frequency identification positioning. Background technique: [0002] In recent years, the rapid development of positioning technology has been driven by the growing demand for location-based services. Radio Frequency Identification (RFID) technology has been widely used in the field of positioning due to its simple system structure and non-contact transmission mode. According to the different ranging methods in the positioning process, RFID positioning technology is mainly divided into methods based on Received Signal Strength Indicator (RSSI) and Time Of Arrival (TOA). Due to the corresponding relationship between phase and time, in recent years, RFID positioning technology based on received signal phase (Received Signal Phase, RSP) has gradually developed. On the basis of th...

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 Applications(China)
IPC IPC(8): G01S5/22G01S15/74
CPCG01S5/22G01S15/74
Inventor 陈智军代重阳韩宇陈智熊志强徐辅庆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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