CN102622620A - Wireless identification read-write device - Google Patents
Wireless identification read-write device Download PDFInfo
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- CN102622620A CN102622620A CN2012100062441A CN201210006244A CN102622620A CN 102622620 A CN102622620 A CN 102622620A CN 2012100062441 A CN2012100062441 A CN 2012100062441A CN 201210006244 A CN201210006244 A CN 201210006244A CN 102622620 A CN102622620 A CN 102622620A
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Abstract
The invention discloses a wireless identification read-write device. In the wireless identification read-write device, a crystal oscillator is connected with a phase-locked loop, the phase-locked loop is connected with a modulator, and the modulator is connected with a power amplifier, so that a radio frequency transmitter is formed; the power amplifier is connected with a circulator, and the circulator is connected with an antenna for sending a signal; the received electronic label signal is connected with the circulator by the antenna, the circulator is connected with a demodulator, the demodulator is connected with a differential amplifier, and the differential amplifier is connected with a comparator, so that a radio frequency receiver is formed; and the comparator is connected with a DSP (Digital Signal Processor), and the DSP is connected with a power control unit, a state indication lamp, a memory and a communication interface, so that a controller is formed. According to the wireless identification read-write device, a zero intermediate frequency demodulation technology and a self synchronization technology are adopted, so that the system design is simplified, and the system reliability is enhanced; and the working frequency is the ultrahigh frequency of 900 MHz, so that the automation level and convenience in the information field can be greatly improved. Therefore, the wireless identification read-write device is suitable for wide application fields of retail industry, logistics industry, manufacturing industry and the like.
Description
Technical field
The present invention relates to RF identification (RFID, Radio Frequency Identification) technical field, is a kind of contactless information automatic identification technology that utilizes radio communication to realize, particularly a kind of wireless identification read write line.
Background technology
The rfid system gordian technique comprises electronic tag, read write line and antenna three parts.The frequency of operation of mainstream technology is 13.56MHz, 860-960MHz and 2.4GHz.But, cheap though the electronic tag of 13.56MHz HF frequency range is passive, however reading distance is too near, has only 10cm farthest, like the ISO14443 agreement, can't satisfy the requirement of reading at a distance; Antenna size is big, and length and width involve great expense up to several meters, and often needs more than two, and even so, reading distance also has only 1-2m farthest, like the ISO15693 agreement.2.45GHz though the rfid system reading distance of frequency range can reach 100m, made things convenient for the user, yet because of electronic tag is active, every is first up to 200-300, this has increased user's cost greatly; And because of antenna is omnirange work, directivity is relatively poor.The rfid interrogator of 860-960MHz uhf band is read and is got distance, can reach 10m; Electronic tag is passive, and is cheap; Antenna size is less, and good directionality has the passive high performance-price ratio advantage of long distance; Yet, the interference maximum that the uhf band signal is suffered, read write line exists not enough at aspects such as reading/writing distance, reliability, antijamming capabilities.
Summary of the invention
The purpose of this invention is to provide a kind of wireless identification read write line; Adopt zero intermediate frequency demodulation techniques and motor synchronizing technology; Avoided common microwave receiver to adopt the complicacy and the difficulty of superhet demodulation; And can from data signal waveforms, extract synchronizing signal, simplify the design of system, and improved the reliability of system.Read write line frequency of operation of the present invention is ultrahigh frequency 900MHz, meets international standard ISO/IEC 18000-6B, C.Read write line can read passive electronic label at a distance, and satisfies the anticollision function.
Concrete technical scheme of the present invention is following:
Wireless identification read write line of the present invention comprises that crystal oscillator, phaselocked loop, modulator, power amplifier, circulator, antenna, detuner, difference are put, comparer, DSP, power control unit, status indicator lamp, memory and communication interface; Wherein: crystal oscillator links to each other with phaselocked loop, and phaselocked loop links to each other with modulator, and modulator links to each other with power amplifier, and they have formed radiofrequency launcher; Power amplifier links to each other with circulator, and circulator links to each other with antenna, and signal is launched.The electronic tag signal of accepting links to each other with circulator through antenna, and circulator links to each other with detuner, and detuner is put with difference and linked to each other, and difference is put with comparer and linked to each other, and they have formed radio frequency receiver.Comparer links to each other with DSP, and DSP links to each other with power control unit, status indicator lamp, memory and communication interface, and they have formed controller.
The beneficial effect that the present invention has is:
Adopt the zero intermediate frequency demodulation techniques, simplified the design of system, and improved the reliability of system.Read write line of the present invention works in the frequency into ultrahigh frequency 900MHz, meets international standard ISO/IEC 18000-6B, C.Far away and the lower main product that will become following RFID field of cost because of its reading/writing distance can greatly improve the robotization and the convenient degree of message area, and is applied widely.
Description of drawings
Fig. 1 is a wireless identification read write line structured flowchart of the present invention;
Fig. 2 is a wireless identification read-write application system synoptic diagram of the present invention.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment is a prerequisite with technical scheme of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the wireless identification read write line of present embodiment is that crystal oscillator 1 is linked to each other with phaselocked loop 2, and phaselocked loop 2 links to each other with modulator 3, and modulator 3 links to each other with power amplifier 4, and they have formed radiofrequency launcher; Power amplifier 4 links to each other with circulator 5, and circulator 5 links to each other with antenna 6, and signal is launched.The electronic tag signal of receiving links to each other with circulator 5 through antenna 6, and circulator 5 links to each other with detuner 7, and detuner 7 is put 8 and linked to each other with differing from, and differs to put 8 and link to each other with comparer 9, and they have formed radio frequency receiver.Comparer 9 links to each other with DSP10, and DSP10 links to each other with power control unit 11, status indicator lamp 12, memory 13 and communication interface 14, and they have formed controller.
The basic functional principle of present embodiment is following:
Crystal oscillator 1 provides 900MHz local vibration source for phaselocked loop 2, and DSP10 controls phaselocked loop 2, and both link to each other with modulator 3 simultaneously for their, the UHF signal that order and the signal of DSP10 is modulated to 900MHz.Modulator 3 links to each other with power amplifier 4, and radiofrequency signal is amplified, and delivers to circulator 5 then and carries out sending and receiving Signal Spacing and directional transmissions, and circulator 5 links to each other with antenna 6, and just radiofrequency signal is transformed to electromagnetic wave, is transmitted into the space.
The electronic tag signal of receiving is transformed to electric signal through antenna 6 from electromagnetic wave.Antenna 6 links to each other with circulator 5, and isolation and directional transmissions are transformed to intermediate-freuqncy signal then to detuner 7.Detuner 7 is put 8 and is linked to each other with difference, differs to put 8 and link to each other with comparer 9, and they have formed radio frequency receiver, amplify to the received signal with shaping and handle.
DSP10 is the core of controller; It is controlled Unit 11, status indicator lamp 12, memory 13 and communication interface 14 with comparer 9, power and links to each other; Accomplish coding, the decoding of signal; The function of ISO/IEC18000-6B such as anti-collision algorithm, C protocol requirement, and communicate through communication interfaces such as RS232 and host computer.
As shown in Figure 2; Application system is made up of wireless identification read write line of the present invention, PC and electronic tag; Through non-contacting electromagnetic field work, connect through communication interfaces such as RS232 between read write line and the PC between read write line and the electronic tag, PC is through upper computer software control read write line; Accomplish identification on the one hand, accomplish the work relevant such as database on the other hand with application system to electronic tag.
Principal feature and advantage that present embodiment is concrete are following:
√ ISM uhf band: frequency of operation is 902-928MHz, and this frequency range is the frequency range that authentication can be used that need not of FCC definition
√ is applied widely: can read the passive electronic label that all meet ISO18000-6B, C type agreement
√ is remote: outdoor steady operation distance is not less than 6 meters
√ is highly reliable: adapt to industrial (40 ℃-85 ℃), unique waterproof, shock counter measure
The high intelligence of √: can realize automatically between read write line and the electronic tag, at a high speed, bidirectional data transfers, need not manual intervention
√ is low-cost: electronic tag is passive
√ general-purpose interface: RS-232 serial ports, RS-485, Wiegand 26
The √ profile is small and exquisite, and cost performance is high: this is determined by working frequency range
√ is safer: communication encryption and data check
Can find out by above embodiment; The present invention adopts zero intermediate frequency demodulation techniques and motor synchronizing technology; Avoided common microwave receiver to adopt the complicacy and the difficulty of superhet demodulation; And can from data signal waveforms, extract synchronizing signal, simplify the design of system, and improved the reliability of system.Read write line frequency of operation of the present invention is ultrahigh frequency 900MHz, meets international standard ISO/IEC 18000-6B, C.Read write line is the far away and lower main product that will become following RFID field of passive electronic label cost because of its reading/writing distance, can greatly improve the robotization and the convenient degree of message area, is applicable to application fields such as retail trade, logistics, manufacturing industry.
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.
Claims (5)
1. a wireless identification read write line is characterized in that, comprises that crystal oscillator, phaselocked loop, modulator, power amplifier, circulator, antenna, detuner, difference are put, comparer, DSP, power control unit, status indicator lamp, memory and communication interface; Wherein: crystal oscillator links to each other with phaselocked loop, and phaselocked loop links to each other with modulator, and modulator links to each other with power amplifier, and they have formed radiofrequency launcher; Power amplifier links to each other with circulator, and circulator links to each other with antenna, and signal is launched; The electronic tag signal of accepting links to each other with circulator through antenna, and circulator links to each other with detuner, and detuner is put with difference and linked to each other, and difference is put with comparer and linked to each other, and they have formed radio frequency receiver; Comparer links to each other with DSP, and DSP links to each other with power control unit, status indicator lamp, memory and communication interface, and they have formed controller.
2. wireless identification read write line according to claim 1; It is characterized in that: said radiofrequency launcher, wherein crystal oscillator is that phaselocked loop provides 900MHz local vibration source, DSP controls phaselocked loop; Their both link to each other with modulator simultaneously, the UHF signal that order and the signal of DSP is modulated to 900MHz; Modulator links to each other with power amplifier, and radiofrequency signal is amplified, and delivers to circulator then and carries out sending and receiving Signal Spacing and directional transmissions, and circulator links to each other with antenna, and radiofrequency signal is transformed to electromagnetic wave, is transmitted into the space.
3. wireless identification read write line according to claim 1 is characterized in that: said radio frequency receiver, and the electronic tag signal of wherein receiving is transformed to electric signal through antenna from electromagnetic wave; Antenna links to each other with circulator, and isolation and directional transmissions are transformed to intermediate-freuqncy signal then to detuner; Radio frequency receiver amplifies with shaping to the received signal to be handled.
4. wireless identification read write line according to claim 1 is characterized in that: said controller is accomplished coding, the decoding of signal, the function of anti-collision algorithm, and communicate through communication interface and host computer.
5. according to each described wireless identification read write line of claim 1-4, it is characterized in that: said read write line adopts zero intermediate frequency demodulation techniques and motor synchronizing technology.
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| CN2012100062441A CN102622620A (en) | 2012-01-10 | 2012-01-10 | Wireless identification read-write device |
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| CN2012100062441A CN102622620A (en) | 2012-01-10 | 2012-01-10 | Wireless identification read-write device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646261A (en) * | 2013-11-30 | 2014-03-19 | 四川久远新方向智能科技有限公司 | Intelligent traffic radio frequency card automatic reading and inquiring system |
| CN111988066A (en) * | 2020-09-11 | 2020-11-24 | 南京陆加壹智能科技有限公司 | UHF RFID discrete component read-write module |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042728A (en) * | 2007-04-20 | 2007-09-26 | 清华大学 | Portable radio frequency recognizing read-write machine |
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- 2012-01-10 CN CN2012100062441A patent/CN102622620A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042728A (en) * | 2007-04-20 | 2007-09-26 | 清华大学 | Portable radio frequency recognizing read-write machine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646261A (en) * | 2013-11-30 | 2014-03-19 | 四川久远新方向智能科技有限公司 | Intelligent traffic radio frequency card automatic reading and inquiring system |
| CN103646261B (en) * | 2013-11-30 | 2017-08-18 | 四川久远新方向智能科技有限公司 | Intelligent traffic radio frequency card reads inquiry system automatically |
| CN111988066A (en) * | 2020-09-11 | 2020-11-24 | 南京陆加壹智能科技有限公司 | UHF RFID discrete component read-write module |
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Application publication date: 20120801 |