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

Distance measurement device and method based on multi-band phase information of surface acoustic wave devices

A surface acoustic wave device and phase information technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as ambiguity and inaccurate distance measurement, and achieve the effect of solving phase ambiguity and high-precision distance measurement

Active Publication Date: 2020-04-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the deficiencies in the prior art, the present invention provides a ranging method combining the phase information of multi-frequency SAW devices, respectively measuring the phases of the SAW-RFID and the resonator located at the same position, performing addition and subtraction operations on the phases, and calculating The unambiguous phase at the new frequency can solve the problem of inaccurate ranging caused by 360° phase ambiguity, and realize high-precision distance measurement

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
  • Distance measurement device and method based on multi-band phase information of surface acoustic wave devices
  • Distance measurement device and method based on multi-band phase information of surface acoustic wave devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] The distance measuring method of the present invention will be described in further detail below with reference to the drawings and embodiments.

[0034] In order to solve the 360° phase ambiguity problem, the phase quadratic phase difference method is adopted. That is: select 3 surface acoustic wave devices with different working center frequencies (not limited to 3, but more), where the three different center frequencies satisfy: f1figure 1 shown. The frequency f1 is small enough that the phase p1 has no 360° phase ambiguity, but its precision is very low, as figure 1 The dashed box at the bottom of is the fluctuation range. The other 2 phases have 360° phase blur. For phase p2, limited to the fluctuation range of phase p1, phase p2 has no 360° phase ambiguity, and the only N value in formula (4) can be obtained, and its accuracy is slightly improved, as figure 1 The dashed box in the middle shows its fluctuation range. Similar to phase p2, phase p3 is limited wit...

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 distance measurement device and method based on multi-band phase information of surface acoustic wave devices, thereby measuring a distance between a reader and a sensor probe. The sensor probe comprises three surface acoustic wave devices: an SAW-RFID chip A, an SAW-RFID chip B, and a surface acoustic wave resonator. The working frequency band of the SAW-RFID chip A ranges from 2.4 GHz to 2.44 GHz, and the center frequency of the SAW-RFID chip A is 2.42 GHz. The working frequency band of the SAW-RFID chip B is from 2.44 GHz to 2.48 GHz, and the center frequency of the SAW-RFID chip B is 2.46 GHz. The working frequency band of the surface acoustic wave resonator is from 420 MHz to 440 MHz, and the center frequency of the surface acoustic wave resonator is 433 MHz.The reader has a phase information acquisition mode for acquiring three devices with different center frequencies. The method comprises the steps that phase information of the surface acoustic wave sensing devices of three different frequency bands is integrated by utilizing the characteristic that the center working frequencies of three surface acoustic wave devices forming the sensor probe arenot overlapped; and the distance between the reader and the sensor probe is measured by using a quadratic phase difference method to process phase information. Therefore, the high-precision distance measurement can be realized.

Description

technical field [0001] The invention relates to the technical field of surface acoustic wave sensors, in particular to a distance measuring device and method based on multi-band phase information of surface acoustic wave (SAW, Surface Acoustic Wave) devices. Background technique [0002] Wireless passive SAW-RFID integrates tags and sensors and has the following advantages: Since the surface acoustic wave sensor is composed of piezoelectric materials and does not contain semiconductor devices, it is a "coreless" device, so it only requires extremely low energy Can work, and then realize wireless passive. It relies on sound waves to work internally. Sound waves propagate on the chip surface with an accurate delay of ns level. The delay has an estimable and measurable change law, which can be distinguished from the delay of electromagnetic waves in space in theory. In the process of transmitting and receiving sensor echoes, by separating and accurately measuring the delay of ...

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): G01S7/539G01S7/526
CPCG01S7/539G01S7/526
Inventor 李红浪卢孜筱柯亚兵李鹏旭
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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