CN102279939B - RFID tag simulator - Google Patents
RFID tag simulator Download PDFInfo
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- CN102279939B CN102279939B CN 201110151769 CN201110151769A CN102279939B CN 102279939 B CN102279939 B CN 102279939B CN 201110151769 CN201110151769 CN 201110151769 CN 201110151769 A CN201110151769 A CN 201110151769A CN 102279939 B CN102279939 B CN 102279939B
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Abstract
The invention provides a RFID (Radio Frequency Identification) tag simulator. The simulator comprises a base band processing unit and a radio frequency simulation unit; the radio frequency simulation unit comprises an impedance matching module and a radio frequency receiving module, wherein the impedance matching module is used for simulating a good impedance match state, a complete impedance mismatch state and a impedance match state between the good impedance match state and the complete impedance mismatch state, between an antenna and a chip of the RFID tag, and the radio frequency receiving unit is used for receiving and demodulating communication data of a reader under test; and the base band processing unit is used for decoding the communication data of the radio frequency receivingunit and controlling the impedance match state of the impedance matching module. The RFID tag simulator provided by the invention regulates the impedance match state between the antenna and the chip so as to work between the good impedance match state and a poor impedance match state, even the complete impedance mismatch state, thereby testing the reading capability of the reader at this moment.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of RFID tag simulator.
Background technology
Along with the propelling of social modernization's process, infotech is changing just rapidly people's life.At present, automatic identification technology has obtained popularizing fast and using at numerous areas such as sale of goods, flow distribution, circulation of commodities and the manufacturings, has begun to take shape one and has comprised that barcode technology, magnetic card technique etc. integrate the new and high technology subject of computing machine, electronics, the communication technology.
For above-mentioned barcode technology, although its bar code is made, usage comparison is cheap, there is the problem that storage capacity is little and can not rewrite.And in magnetic card technique, the general IC-card (such as phone IC-card, bank card etc.) with contact row that adopts, under many circumstances, the connection of this mechanical contact is insecure.For the deficiency of above-mentioned technology, non-contacting recognition system has appearred---radio-frequency recognition system (RFID-Radio Frequency Identification).RFID is that a kind of radiowave that utilizes is read and write programmed recording medium, radio-frequency technique is combined with the IC-card technology, and can be used for the technology of remote, moving-target, wireless identification.
At present, in RFID, the ultrahigh-frequency tag of normal use is passive form, and the power supply of its chip circuit is the electromagnetic wave energy from the antenna transmission of the reader of corresponding use with it.Label is whether to realize by the impedance matching between himself chip and the antenna to the signal of reader transmission, it is the impedance matching absorbed energy, the impedance mismatching reflected energy, chip just can reflect the reader projectile energy of varying strength to the reader transmission of signal according to impedance matching and mismatch like this.Therefore, for passive label, the receiving sensitivity whether its impedance matching reaches reader has determined the communication performance of label.Thus, the label reading capability that label is under the different impedance matching states is one of critical nature of reader.
Along with the maturation of FRID hardware technology and popularizing of FRID application, each production firm and scientific research institution competitively join in the middle of the research and exploitation of FRID reader.Along with the research and development of FRID reader, the label simulator that is used for the FRID reader is tested is equally also in corresponding exploitation.At present, research and development to the label simulator mainly concentrate on the agreement of label, the most modulation formats of impedance matched well and the complete mismatch of impedance that adopt of the artificial antenna of this type of label simulator and the impedance matching between the chip realize that it mainly is to analyze the needs whether reader satisfies agreement.And for the label of reality, its antenna and chip are that the form by back-off or bonding is packaged together, the impedance matching situation of label just was fixed up after encapsulation was finished, and be to be difficult to completely impedance matching in work, generally between impedance matched well and the complete mismatch of impedance.As seen, existing label simulator can not be for detection of label between impedance matched well and the complete mismatch of impedance the time, the reading capability of reader.
Summary of the invention
The invention provides a kind of RFID tag simulator, carrying out reader when test, the antenna of RFID tag that can control simulation and the impedance matching state between the chip.
The invention provides a kind of RFID tag simulator, comprise baseband processing unit and radio frequency analog unit, described radio frequency analog unit comprises:
Impedance matching module, the antenna of analog radio frequency identification label and the complete mismatch of impedance matched well, impedance between the chip and the impedance matching state between impedance matched well and the complete mismatch of impedance;
Receiver Module receives the also communication data of demodulation reader to be measured;
Described baseband processing unit decoding Receiver Module communication data, and control the impedance matching state of described impedance matching module.
Aforesaid RFID tag simulator, wherein, described impedance matching module comprises inductance, voltage controlled capacitor and the electronic selection switch of series connection, each bar branch road of described electronic selection switch all is in series with resistance, and is parallel with one another between each described resistance.
Aforesaid RFID tag simulator, wherein, described impedance matching module comprises inductance and the electronic selection switch of series connection, each bar branch road of described electronic selection switch all is in series with resistance, and is parallel with one another between each described resistance; Be parallel with voltage controlled capacitor on the series arm that described electronic selection switch and described resistance form.
Aforesaid RFID tag simulator, wherein, described baseband processing unit comprises communication interface and the field programmable gate array of electrical connection; Described field programmable gate array is used for communicating with computing machine by communication interface, and according to the impedance matching state of computing machine definition the incident carrier wave is carried out load-modulate.
Aforesaid RFID tag simulator, wherein, described field programmable gate array is electrically connected with described impedance matching module, is used for controlling the gating of described electronic selection switch and the magnitude of voltage at voltage controlled capacitor two ends.
RFID tag simulator provided by the invention by the antenna of adjusting simulation and the impedance matching situation between the chip, can be operated between impedance matched well and bad even the complete mismatch of impedance it, and tests the reading capability of reader this moment.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of instructions, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the systematic schematic diagram of RFID tag simulator of the present invention;
Fig. 2 is the impedance matching module circuit diagram of RFID tag simulator embodiment 1 of the present invention;
Fig. 3 is the impedance matching module circuit diagram of RFID tag simulator embodiment 2 of the present invention.
Reference numeral:
The 1-Base Band Unit; 2-radio frequency analog unit; The 3-low pressure difference linear voltage regulator;
The 4-radio-frequency (RF) switch; The 5-real part; The 6-imaginary part;
The 7-digital-to-analog conversion; The 8-demodulator circuit; The 9-field programmable gate array;
The 10-DSP microprocessor; The 11-communication interface; The 12-inductance;
The 13-voltage controlled capacitor; The 14-electronic selection switch; The 15-impedance matching module;
The 16-Receiver Module; R
1～R
10-resistance.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
As shown in Figure 1, the systematic schematic diagram of RFID tag simulator of the present invention, it is comprised of the two large divisions, comprises Base Band Unit 1 and radio frequency analog unit 2.Radio frequency analog unit 2, comprise impedance matching module 15 and Receiver Module 16, impedance matching module 15 is used for the antenna of analog radio frequency identification label and the complete mismatch of impedance matched well, impedance between the chip and the impedance matching state between impedance matched well and the complete mismatch of impedance; Receiver Module 16 is used for receiving the also communication data of demodulation reader to be measured; This communication data obtains by antenna or concentric cable.The communication data that 1 pair of Receiver Module of baseband processing unit 16 receives is decoded, and the baseband signal of computer export is modulated, and the signal after will modulating transfers out through antenna or concentric cable.
Wherein, Base Band Unit 1 comprises communication interface 11, DSP (digital signal processor) microprocessor 10 and field programmable gate array (FPGA, Field-Programmable Gate Array) 9.Field programmable gate array 9 is used for communication data is carried out Code And Decode, and communicates by communication interface and computing machine.Communication interface can be Ethernet interface or RS232 serial ports.DSP microprocessor 10 is used for satisfying the agreement needs of communicating by letter between field programmable gate array 9 and the computing machine.Namely, DSP microprocessor 10 is by the various instructions of Ethernet interface or the control of RS232 serial ports process computer, and send it to field programmable gate array 9, field programmable gate array 9 comes the real part 5 of impedance matching module 15 and imaginary part 6 are controlled accordingly, simultaneously modulation signal is transferred out through antenna or concentric cable.
Wherein, radio frequency analog unit 2 comprises impedance matching module 15 and Receiver Module 16.
Real part 5 and the imaginary part 6 of impedance matching module 15 are controlled by field programmable gate array 9 respectively.The circuit connecting relation of simulation as shown in Figure 2, comprise the inductance 12, voltage controlled capacitor 13 and the electronic selection switch 14 that are electrically connected in turn, all connect a resistance on each bar branch road of electronic selection switch 14, be provided with altogether in this embodiment 10 resistance R that resistance is different
1～R
10, 10 above-mentioned resistance are parallel with one another, and are total to earthing pole ground connection at the end away from electronic selection switch 14.By the magnitude of voltage on the computer control voltage controlled capacitor, when receiving end adopts antenna, so that antennal interface (adopting 50 ohm standard interface herein) locates to present induction reactance, capacitive reactance or resonant condition; When receiving end adopts concentric cable (adopting 50 ohm standard coaxial cable herein), present induction reactance, capacitive reactance or resonant condition in the port of concentric cable, simulate the situation of the imaginary impedance coupling of the imaginary part of label simulator antenna and chip, come the different resistance of gating by computer control electronic selection switch 14, resistance value greater than 50 ohm or less than 50 ohm condition under the situation of the anti-coupling of real part master of the real part of artificial antenna and chip.
This RFID tag simulator is to adopt active mode to simulate passive true label, in this active RFID tag simulator, adopt low pressure difference linear voltage regulator 3 (LDO, low dropout regulator) power, assurance can receive normally.When the received communication data, radio-frequency (RF) switch 4 switches to and is communicated with demodulator circuit 8, demodulator circuit carries out demodulation process to communication data, and be delivered to field programmable gate array 9 through the level treatment circuit, field programmable gate array 9 provides modulator control signal according to command information, comes the real part 5 in the control group matching module 15, and come imaginary part 6 in the control group matching module 15 by digital-to-analog conversion 7, to carry out corresponding impedance operation.
In the RFID tag of reality, chip is a standard component, and its impedance is changeless, and the impedance matching situation of antenna and chip is affected by the design of antenna.But, because when carrying out impedance matching, the inductance that changes inductance 12 is relatively more difficult, has therefore done equivalent replacement in RFID tag simulator of the present invention, namely do not change resistance and the inductance of the antenna part of simulation, but change resistance and the electric capacity of analog chip part.This equivalence is replaced, and in real passive radio-frequency identification labeled, the impedance of chip is fixed, and the impedance of antenna is uncertain, and the impedance matching between antenna and the chip is determined by the design of antenna.Change strength of carrier that resistance and/or capacitance can simulated reflections incident and the variation of phase place.
Comparatively speaking, can be relatively easy to realize the change of capacitance and resistance value by the circuit of introducing among above-mentioned Fig. 2, in the reflection debugging, the resistance of a resistance of field programmable gate array control electronic selection switch 14 any gatings realizes reflecting the variation of the degree of depth, and the magnitude of voltage at control voltage controlled capacitor two ends, come the antenna of Reality simulation RFID tag and the impedance matching state between the chip, so the test reader under the various label impedance matching states to the response performance of reflected signal.Above-mentioned realization mechanism is, computing machine uses the interface to define corresponding impedance matching state by the user, field programmable gate array is controlled the impedance matching state that the voltage at the gating of electronic strobe switch 14 and voltage controlled capacitor two ends obtains to stipulate accordingly according to the impedance matching state of computing machine definition, under this impedance matching state the incident carrier wave is carried out load-modulate.
Shown in Figure 3, the impedance matching module circuit diagram of RFID tag simulator embodiment 2 of the present invention, the difference of itself and above-described embodiment is, inductance 12 and electronic selection switch 14 series connection, all connect a resistance on each bar branch road of electronic selection switch 14, be provided with altogether in this embodiment 10 resistance R that resistance is different
1～R
10, 10 above-mentioned resistance are parallel with one another, and are total to earthing pole ground connection at the end away from electronic selection switch 14.And, voltage controlled capacitor 13 in parallel on the series arm that electronic selection switch 14 and resistance form.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (3)
1. a RFID tag simulator comprises baseband processing unit and radio frequency analog unit, it is characterized in that, described radio frequency analog unit comprises:
Impedance matching module, the antenna of analog radio frequency identification label and the complete mismatch of impedance matched well, impedance between the chip and the impedance matching state between impedance matched well and the complete mismatch of impedance;
Receiver Module receives the also communication data of demodulation reader to be measured;
Described baseband processing unit decoding Receiver Module communication data, and control the impedance matching state of described impedance matching module;
Described baseband processing unit comprises communication interface and the field programmable gate array of electrical connection; Described field programmable gate array is used for communicating with computing machine by communication interface, and according to the impedance matching state of computing machine definition the incident carrier wave is carried out load-modulate;
Described field programmable gate array is electrically connected with described impedance matching module, is used for controlling the gating of electronic selection switch of described impedance matching module and the magnitude of voltage at voltage controlled capacitor two ends.
2. RFID tag simulator according to claim 1, it is characterized in that, described impedance matching module comprises inductance, voltage controlled capacitor and the electronic selection switch of series connection, and each bar branch road of described electronic selection switch all is in series with resistance, and is parallel with one another between each described resistance.
3. RFID tag simulator according to claim 1 is characterized in that, described impedance matching module comprises inductance and the electronic selection switch of series connection, and each bar branch road of described electronic selection switch all is in series with resistance, and is parallel with one another between each described resistance; Be parallel with voltage controlled capacitor on the series arm that described electronic selection switch and described resistance form.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110151769 CN102279939B (en) | 2011-06-07 | 2011-06-07 | RFID tag simulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110151769 CN102279939B (en) | 2011-06-07 | 2011-06-07 | RFID tag simulator |
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| CN102279939A CN102279939A (en) | 2011-12-14 |
| CN102279939B true CN102279939B (en) | 2013-10-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103020562B (en) * | 2012-12-12 | 2015-07-22 | 深圳市德卡科技有限公司 | Ultrahigh frequency radio frequency identification device (RFID) self-adaptive antenna impedance matching method |
| CN106815538A (en) * | 2015-12-01 | 2017-06-09 | 深圳云停智能交通技术研究院有限公司 | A kind of preparation method of vehicle-mounted RFID |
| CN106218235B (en) * | 2016-07-27 | 2017-09-05 | 永道无线射频标签(扬州)有限公司 | A kind of labeling method for radio frequency label defective products |
| CN109995442B (en) * | 2017-12-29 | 2022-08-02 | 湖南工业大学 | Burst error code testing method and error code instrument for locomotive network communication system |
| CN210735884U (en) * | 2019-01-30 | 2020-06-12 | 苏州优智达机器人有限公司 | Robot and elevator interaction system |
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| CN1239847A (en) * | 1998-06-23 | 1999-12-29 | 格姆普拉斯有限公司 | Radio-frequency switch with frequency detuned circuit and aerial |
| US7409197B2 (en) * | 2005-03-31 | 2008-08-05 | Intel Corporation | Transceiver with receive path overload protection and method |
| US7848386B2 (en) * | 2006-09-22 | 2010-12-07 | Broadcom Corporation | Frequency hopping RF transceiver with programmable antenna and methods for use therewith |
| CN101272134B (en) * | 2007-03-23 | 2011-08-31 | 群康科技(深圳)有限公司 | Impedance matching circuit, impedance matching method and personal computer |
| CN201654821U (en) * | 2010-04-21 | 2010-11-24 | 中国电子技术标准化研究所 | Radio frequency identification electronic tag simulator |
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Granted publication date: 20131016 Termination date: 20160607 |