CN103268514A - Radio frequency identification system based on SAW technology - Google Patents
Radio frequency identification system based on SAW technology Download PDFInfo
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Abstract
The invention discloses a radio frequency identification system based on SAW technology, which comprises a surface acoustic wave tag and a matched reader; the surface acoustic wave label consists of a substrate, an interdigital transducer and a reflecting electrode, wherein the interdigital transducer and the reflecting electrode are arranged on the substrate; the reader comprises a control processing module, a transmitting module and a receiving module which are respectively accessed to the control processing module, a circulator which is simultaneously accessed to the transmitting module and the receiving module, a receiving and transmitting antenna which is accessed to the circulator, and a phase-locked loop frequency synthesizer which provides local oscillation signals to the transmitting module and the receiving module.
Description
Technical field
The present invention relates to the radio-frequency recognition system field, be specially a kind of radio-frequency recognition system based on the SAW technology.
Background technology
The rfid system based on IC tag that current drag flow is exercised usefulness also has a lot of problems not solve, if any in complex environments such as metal object, liquid, high temperature, strong electromagnetic the time, its information reads difficulty, though a lot of companies and research and development institution propose much to improve one's methods at the rfid system based on IC tag, still can't reach good recognition performance based on the rfid system of IC tag.
Summary of the invention
The purpose of this invention is to provide a kind of radio-frequency recognition system based on the SAW technology, to solve the problem that the prior art radio system exists.
In order to achieve the above object, the technical solution adopted in the present invention is:
Radio-frequency recognition system based on the SAW technology is characterized in that: include surface acoustic wave label and supporting reader;
The substrate that described surface acoustic wave label is made by piezoelectric crystal material, be arranged in suprabasil interdigital transducer, be arranged in the substrate and horizontal repeller in interdigital transducer the place ahead constitutes, two buses of described interdigital transducer are connected with antenna respectively, described repeller is made of a plurality of equidistant horizontal reflection bars in interdigital transducer the place ahead successively that are parallel to each other, wherein keep at a certain distance away between first reflection bar and the interdigital transducer;
Described reader comprises the control processing module, transmitter module and the receiver module of difference Access Control processing module, insert the circulator of transmitter module and receiver module simultaneously, insert the dual-mode antenna of circulator, the phase-locked loop frequency synthesizer of local oscillation signal to transmitter module and receiver module is provided, wherein control processing module by single-chip microcomputer and insert single-chip microcomputer and constitute based on the coding-decoding circuit that FPGA makes up, the input end of described transmitter inserts coding-decoding circuit, the transmitter output terminal inserts circulator, the input end of described receiver inserts circulator, and the output terminal of receiver inserts coding-decoding circuit;
Computing machine sends the Card Reader signal to reader, after reader receives the Card Reader signal, the dual-mode antenna of reader sends high-frequency impulse as interrogation pulse to the surface acoustic wave label, one of them antenna of surface acoustic wave label receives the interrogation pulse of reader emission, the interrogation pulse that is received is transformed into surface acoustic wave by the interdigital transducer of surface acoustic wave label, the substrate surface that described surface acoustic wave is made at piezoelectric crystal material is transmitted to repeller, repeller partly reflects the surface acoustic wave of incident, the surface acoustic wave of reflected back turns back to interdigital transducer, interdigital transducer is transformed into high-frequency impulse as transponder pulse with the surface acoustic wave of reflected back again, described transponder pulse is sent to reader by another antenna of surface acoustic wave label, thereby reader receives answer signal.
Described radio-frequency recognition system based on the SAW technology, it is characterized in that: described transmitter module is made of modulation circuit and power amplifier, wherein the modulation circuit input end inserts coding-decoding circuit, the output terminal of modulation circuit inserts the input end of power amplifier, the output terminal of power amplifier inserts circulator, and described phase-locked loop frequency synthesizer sends local oscillation signal to the modulation circuit of transmitter module.
Described radio-frequency recognition system based on the SAW technology, it is characterized in that: described receiver module is by lower frequency changer circuit, amplify, low-pass filter circuit, rectification circuit, signal shaping, analog to digital conversion circuit constitutes, wherein the lower frequency changer circuit input end inserts circulator, the lower frequency changer circuit output terminal inserts and amplifies, the low-pass filter circuit input end, amplify, the low-pass filter circuit output terminal inserts rectification circuit input end, rectification circuit output end inserts signal shaping, the analog to digital conversion circuit input end, signal shaping, the analog to digital conversion circuit output terminal inserts coding-decoding circuit, and described phase-locked loop frequency synthesizer sends local oscillation signal to the lower frequency changer circuit of receiver module.
The radio system that the present invention utilizes surface acoustic wave (SAW) technology to realize, it is as identification label with SAW (Surface Acoustic Wave) device, not only information reads relatively easy realization in complex environment, and require the defective of direct supply when having overcome the IC chip operation, and security and many card reading efficiencies all have a clear superiority in than traditional RFID, the performance of radio-frequency recognition system is greatly improved, and decipherment distance can be above ten meters farthest.Being very suitable for vehicle does not suspend expense recognition system, landmark identification system, the identification of rolling stock license number and train and accurately stops systems such as control.
Description of drawings
Fig. 1 is system principle diagram of the present invention.
Fig. 2 is surface acoustic wave label construction synoptic diagram of the present invention.
Fig. 3 is reader theory diagram of the present invention.
Fig. 4 is reader structured flowchart of the present invention.
Embodiment
As shown in Figure 1.Based on the radio-frequency recognition system of SAW technology, include surface acoustic wave label and supporting reader;
As shown in Figure 2.The substrate 1 that the surface acoustic wave label is made by piezoelectric crystal material, be arranged in interdigital transducer 2 in the substrate 1, be arranged in the substrate 1 and horizontal repeller 3 in interdigital transducer 2 the place aheads constitutes, two buses of interdigital transducer 2 are connected with antenna 4 respectively, repeller 3 is made of a plurality of equidistant horizontal reflection bars in interdigital transducer the place ahead successively that are parallel to each other, wherein keep at a certain distance away between first reflection bar and the interdigital transducer 2;
As shown in Figure 3, Figure 4.Reader comprises the control processing module, transmitter module and the receiver module of difference Access Control processing module, insert the circulator of transmitter module and receiver module simultaneously, insert the dual-mode antenna of circulator, the phase-locked loop frequency synthesizer of local oscillation signal to transmitter module and receiver module is provided, wherein control processing module by single-chip microcomputer and insert single-chip microcomputer and constitute based on the coding-decoding circuit that FPGA makes up, the input end of described transmitter inserts coding-decoding circuit, the transmitter output terminal inserts circulator, the input end of described receiver inserts circulator, and the output terminal of receiver inserts coding-decoding circuit;
Computing machine sends the Card Reader signal to reader, after reader receives the Card Reader signal, the dual-mode antenna of reader sends high-frequency impulse as interrogation pulse to the surface acoustic wave label, one of them antenna of surface acoustic wave label receives the interrogation pulse of reader emission, the interrogation pulse that is received is transformed into surface acoustic wave by the interdigital transducer of surface acoustic wave label, the substrate surface that described surface acoustic wave is made at piezoelectric crystal material is transmitted to repeller, repeller partly reflects the surface acoustic wave of incident, the surface acoustic wave of reflected back turns back to interdigital transducer, interdigital transducer is transformed into high-frequency impulse as transponder pulse with the surface acoustic wave of reflected back again, described transponder pulse is sent to reader by another antenna of surface acoustic wave label, thereby reader receives answer signal.
Transmitter module is made of modulation circuit and power amplifier, wherein the modulation circuit input end inserts coding-decoding circuit, the output terminal of modulation circuit inserts the input end of power amplifier, the output terminal of power amplifier inserts circulator, and described phase-locked loop frequency synthesizer sends local oscillation signal to the modulation circuit of transmitter module.
Receiver module is made of lower frequency changer circuit, amplification, low-pass filter circuit, rectification circuit, signal shaping, analog to digital conversion circuit, wherein the lower frequency changer circuit input end inserts circulator, the lower frequency changer circuit output terminal inserts amplification, low-pass filter circuit input end, amplification, low-pass filter circuit output terminal insert rectification circuit input end, rectification circuit output end inserts signal shaping, analog to digital conversion circuit input end, signal shaping, analog to digital conversion circuit output terminal insert coding-decoding circuit, and described phase-locked loop frequency synthesizer sends local oscillation signal to the lower frequency changer circuit of receiver module.
Among the present invention, the repeller that in the surface acoustic wave label each reflection bar is constituted makes its reflected signal represent the coded message of stipulating by certain specific rule design, and the reflection high-frequency impulse that receives of reader just has the specific coding of these article so.By demodulation and processing, reach the purpose of automatic identification.
The principle of work of surface acoustic wave label is the surface acoustic wave electronic tag to be installed in be identified on the object, when having being identified object and entering the effective reading scope of reader of surface acoustic wave label, the reader Auto-Sensing is to the existence of surface acoustic wave label, send instruction to the surface acoustic wave label, and receive the information of returning from the surface acoustic wave label, thereby finish the automatic identification to object.Because acoustic surface wave propagation speed is low, the usable reflection train of impulses is just being got back to reader through after the time delay of several microseconds, at this timing period, decay from the noisy reflection around the reader, thereby suppressed the interference that the useful signal to the surface acoustic wave electronic tag brings.The repeller of surface acoustic wave label can be regarded the code device as the bar code as, and as arranging 24 strip label bars in the repeller zone, then echoed signal can obtain 2
24Individual state, these states represent that respectively targets such as different vehicles of numbering, container, workpiece, human or animal are for identification.
In order to reduce the overall dimensions of surface acoustic wave label, when the present invention designs analogue simulation the piezoelectric crystal substrate be the different character of surface acoustic wave when tangential of different crystal and the phase allomeric, for the base material of selecting high frequency stability and high-energy conversion efficiency provides foundation.High frequency stability and energy conversion efficiency can make the surface acoustic wave label have compact structure more, and then reduce the size of piezoelectric substrate.Optimize the structure of surface acoustic wave label interdigital transducer and the frequency characteristic of improvement SAW (Surface Acoustic Wave) device when the present invention designs, adopt the PGSL algorithm to be optimized design to interdigital transducer.
Among the present invention, the transmitter module of reader is modulated transmitting, and is used for sending data to the surface acoustic wave label, and receiver module receives also demodulation from the high-frequency pulse signal of surface acoustic wave label.
Control processing module and the application systems software of reader communicate, and carry out the order that application systems software is sent, the communication process of the control of control processing module and label card (main-from principle), the encoding and decoding function that processing module also plays signal controlled simultaneously.For the system of complexity, the control processing module also can be carried out anti-collision algorithm, and the data that will transmit between surface acoustic wave label and the read write line are encrypted and decipher, and carries out the function of the authentication between transponder and the reader.
In order to finish these complicated tasks, control processing module in most cases and all have microprocessor as core component.Exchanges data between application systems software and the reader is undertaken by RS232 or RS485 serial ports.Interface between transmitter module receiver module and the control processing module shows the state of high frequency interface with binary form.
Complete Card Reader process of reader is as follows:
(1) computing machine sends the Card Reader signal to reader.
(2) transmitter module sends Card Reader order and energy to the surface acoustic wave label by dual-mode antenna; The surface acoustic wave label is handled the order that reader transmits by interdigital transducer and repeller after receiving signal, forms information such as corresponding card number, and dual-mode antenna is given in reflection.
(3) receiver module is handled the surface acoustic wave tag reflection signal that receiving antenna receives, and forms corresponding digital signal and delivers to the control processing module.
(4) computing machine is delivered in control processing module digital signal that receiver module is sent here the processing of decoding.
Claims (3)
1. based on the radio-frequency recognition system of SAW technology, it is characterized in that: include surface acoustic wave label and supporting reader;
The substrate that described surface acoustic wave label is made by piezoelectric crystal material, be arranged in suprabasil interdigital transducer, be arranged in the substrate and horizontal repeller in interdigital transducer the place ahead constitutes, two buses of described interdigital transducer are connected with antenna respectively, described repeller is made of a plurality of equidistant horizontal reflection bars in interdigital transducer the place ahead successively that are parallel to each other, wherein keep at a certain distance away between first reflection bar and the interdigital transducer;
Described reader comprises the control processing module, transmitter module and the receiver module of difference Access Control processing module, insert the circulator of transmitter module and receiver module simultaneously, insert the dual-mode antenna of circulator, the phase-locked loop frequency synthesizer of local oscillation signal to transmitter module and receiver module is provided, wherein control processing module by single-chip microcomputer and insert single-chip microcomputer and constitute based on the coding-decoding circuit that FPGA makes up, the input end of described transmitter inserts coding-decoding circuit, the transmitter output terminal inserts circulator, the input end of described receiver inserts circulator, and the output terminal of receiver inserts coding-decoding circuit;
Computing machine sends the Card Reader signal to reader, after reader receives the Card Reader signal, the dual-mode antenna of reader sends high-frequency impulse as interrogation pulse to the surface acoustic wave label, one of them antenna of surface acoustic wave label receives the interrogation pulse of reader emission, the interrogation pulse that is received is transformed into surface acoustic wave by the interdigital transducer of surface acoustic wave label, the substrate surface that described surface acoustic wave is made at piezoelectric crystal material is transmitted to repeller, repeller partly reflects the surface acoustic wave of incident, the surface acoustic wave of reflected back turns back to interdigital transducer, interdigital transducer is transformed into high-frequency impulse as transponder pulse with the surface acoustic wave of reflected back again, described transponder pulse is sent to reader by another antenna of surface acoustic wave label, thereby reader receives answer signal.
2. the radio-frequency recognition system based on the SAW technology according to claim 1, it is characterized in that: described transmitter module is made of modulation circuit and power amplifier, wherein the modulation circuit input end inserts coding-decoding circuit, the output terminal of modulation circuit inserts the input end of power amplifier, the output terminal of power amplifier inserts circulator, and described phase-locked loop frequency synthesizer sends local oscillation signal to the modulation circuit of transmitter module.
3. the radio-frequency recognition system based on the SAW technology according to claim 1, it is characterized in that: described receiver module is by lower frequency changer circuit, amplify, low-pass filter circuit, rectification circuit, signal shaping, analog to digital conversion circuit constitutes, wherein the lower frequency changer circuit input end inserts circulator, the lower frequency changer circuit output terminal inserts and amplifies, the low-pass filter circuit input end, amplify, the low-pass filter circuit output terminal inserts rectification circuit input end, rectification circuit output end inserts signal shaping, the analog to digital conversion circuit input end, signal shaping, the analog to digital conversion circuit output terminal inserts coding-decoding circuit, and described phase-locked loop frequency synthesizer sends local oscillation signal to the lower frequency changer circuit of receiver module.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103593906A (en) * | 2013-10-28 | 2014-02-19 | 深圳力合防伪技术有限公司 | Antiferromagnetic resonance radio frequency identification ticket management terminal |
| CN103593905A (en) * | 2013-10-28 | 2014-02-19 | 深圳力合防伪技术有限公司 | Antiferromagnetic resonance radio frequency identification ticket management system and method |
| CN103870872A (en) * | 2014-03-18 | 2014-06-18 | 北京无线电计量测试研究所 | Acoustic surface wave pressure sensing label for underground pipes |
| CN104200262A (en) * | 2014-09-09 | 2014-12-10 | 北京中讯四方科技股份有限公司 | Large-capacity surface acoustic wave radio frequency tag |
| CN104296782A (en) * | 2014-10-08 | 2015-01-21 | 南京航空航天大学 | System and method for improving intensity of surface acoustic wave sensing signals |
| CN105807259A (en) * | 2016-04-19 | 2016-07-27 | 广州三星通信技术研究有限公司 | Indoor positioning system, indoor positioning method and mobile terminals |
| CN106253874A (en) * | 2016-09-22 | 2016-12-21 | 深圳华远微电科技有限公司 | A kind of RFID chip based on SAW resonator and encapsulating structure thereof |
| CN107688846A (en) * | 2017-07-25 | 2018-02-13 | 浙江海洋大学 | Wireless identification tag processor |
| CN108241878A (en) * | 2016-12-26 | 2018-07-03 | 航天信息股份有限公司 | A kind of label identification method and equipment |
| CN108809361A (en) * | 2018-07-17 | 2018-11-13 | 中国船舶重工集团公司第七〇九研究所 | A kind of wide bandwidth SAW reader reception device and its method |
| US10418965B2 (en) | 2016-04-19 | 2019-09-17 | Samsung Electronics Co., Ltd. | Positioning method and apparatus |
| CN112733976A (en) * | 2020-12-18 | 2021-04-30 | 攀枝花容则钒钛有限公司 | Pantograph carbon slide abrasion detection system |
| CN113008122A (en) * | 2021-02-01 | 2021-06-22 | 成都柏森松传感技术有限公司 | Wear detection system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103593905A (en) * | 2013-10-28 | 2014-02-19 | 深圳力合防伪技术有限公司 | Antiferromagnetic resonance radio frequency identification ticket management system and method |
| CN103593906A (en) * | 2013-10-28 | 2014-02-19 | 深圳力合防伪技术有限公司 | Antiferromagnetic resonance radio frequency identification ticket management terminal |
| CN103593905B (en) * | 2013-10-28 | 2016-05-04 | 深圳力合防伪技术有限公司 | Antiferromagnetic resonance RF identification voucher management system and method |
| CN103870872B (en) * | 2014-03-18 | 2017-02-15 | 北京无线电计量测试研究所 | Acoustic surface wave pressure sensing label for underground pipes |
| CN103870872A (en) * | 2014-03-18 | 2014-06-18 | 北京无线电计量测试研究所 | Acoustic surface wave pressure sensing label for underground pipes |
| CN104200262A (en) * | 2014-09-09 | 2014-12-10 | 北京中讯四方科技股份有限公司 | Large-capacity surface acoustic wave radio frequency tag |
| CN104296782A (en) * | 2014-10-08 | 2015-01-21 | 南京航空航天大学 | System and method for improving intensity of surface acoustic wave sensing signals |
| CN105807259A (en) * | 2016-04-19 | 2016-07-27 | 广州三星通信技术研究有限公司 | Indoor positioning system, indoor positioning method and mobile terminals |
| US10418965B2 (en) | 2016-04-19 | 2019-09-17 | Samsung Electronics Co., Ltd. | Positioning method and apparatus |
| CN106253874A (en) * | 2016-09-22 | 2016-12-21 | 深圳华远微电科技有限公司 | A kind of RFID chip based on SAW resonator and encapsulating structure thereof |
| CN108241878A (en) * | 2016-12-26 | 2018-07-03 | 航天信息股份有限公司 | A kind of label identification method and equipment |
| CN107688846A (en) * | 2017-07-25 | 2018-02-13 | 浙江海洋大学 | Wireless identification tag processor |
| CN107688846B (en) * | 2017-07-25 | 2020-07-14 | 浙江海洋大学 | Wireless tag processor |
| CN108809361A (en) * | 2018-07-17 | 2018-11-13 | 中国船舶重工集团公司第七〇九研究所 | A kind of wide bandwidth SAW reader reception device and its method |
| CN112733976A (en) * | 2020-12-18 | 2021-04-30 | 攀枝花容则钒钛有限公司 | Pantograph carbon slide abrasion detection system |
| CN113008122A (en) * | 2021-02-01 | 2021-06-22 | 成都柏森松传感技术有限公司 | Wear detection system |
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