A surface acoustic wave localization system and localization method integrating intensity and phase information
A technology of surface acoustic wave and phase information, which is applied in radio wave measurement system, positioning, sound wave reradiation, etc., to achieve the effect of reducing complexity, low system cost and improving accuracy
Active Publication Date: 2022-07-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF0 Cites 0 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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
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 SAW 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 reflection grid, a second reflection grid, 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 part of the piezoelectric substrate constitutes the second propagation channel of the surface acoustic wave. The apertures of the interdigital transducer and the reflection grating of the two propagation channels are equal, but the two propagation channels do not overlap each other, ma...
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
Login to View More Abstract
The invention discloses a surface acoustic wave positioning system and a positioning method integrating intensity and phase information. The surface acoustic wave tag is a dual-frequency dual-channel structure, and the center distance from the reflection grating of the two propagation channels to the interdigital transducer is inversely proportional to its center frequency. The reader is connected to three reader antennas through a one-to-three switch, and the three reader antennas are located at three fixed positions respectively. Before the system positioning, the positioning area is divided into several sub-areas without phase ambiguity problem, and fingerprint points are set at the geometric centroid of the sub-area to establish a fingerprint database. The eigenvalues of each fingerprint point include echo signal strength and phase. A total of 12 Then, the fingerprint positioning algorithm is used to determine the sub-region where the positioning target is located. Finally, the unambiguous phase difference of the echo signal is used as the ranging information, and the two-dimensional coordinates of the positioning target are obtained through the trilateral positioning algorithm. The invention has the characteristics of high positioning accuracy and low system cost, which not only solves the problem of phase ambiguity, but also eliminates the influence of temperature.
Description
Technical field: [0001] The invention relates to a surface acoustic wave positioning system and a positioning method integrating intensity and phase information, and belongs to the field of radio frequency identification positioning. Background technique: [0002] In recent years, the growing demand for location services has driven the rapid development of location technology. Radio Frequency Identification (RFID) technology has been widely used in the field of positioning due to its simple system structure and non-contact transmission. 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, RFID positioning technology based on Received Signal Phase (RSP) has been gradually developed in recent years. On the basis of the above ranging method, the positioning algor...
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
Login to View More Patent Type & Authority Patents(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