CN104217235B - Rfid interrogator, electronic tag and reading/writing method - Google Patents
Rfid interrogator, electronic tag and reading/writing method Download PDFInfo
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- CN104217235B CN104217235B CN201410468986.5A CN201410468986A CN104217235B CN 104217235 B CN104217235 B CN 104217235B CN 201410468986 A CN201410468986 A CN 201410468986A CN 104217235 B CN104217235 B CN 104217235B
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Abstract
The invention discloses a kind of RFID read-write method, including：Rfid interrogator modulates low-frequency modulation signal, and is transferred to RFID by low frequency magnetic field information channel；RFID performs operation according to low-frequency modulation signal, and operating result is returned into rfid interrogator by superfrequency radio-frequency information passage.The invention also discloses a kind of rfid interrogator, including：Oscillating signal generator, a MCU, the first signal modulator, low-frequency modulation signal amplifier, aerial coil, superfrequency wireless receiver and the first demodulator of PM signal PM.The invention also discloses a kind of RFID, including：Low frequency receiver, secondary signal demodulator, the 2nd MCU, programmable attenuator, signal strength detector, ultrahigh-frequency signal transmitter, ultrahigh-frequency signal occur and modulator and memory.So as to accurately control the operating distance between read head and card using low frequency magnetic field information channel.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, radio frequency identification) technical field.
Background technology
With the development of science and technology the continuous improvement of economic level, in the market occurs in that many intelligent artifacts.Such as：Intelligence
Stopping charging system, gate inhibition etc..Information gathering product (RFID read heads or the read write line for matching therewith；The electricity matched with this
Subtab, hereinafter referred to as card) also corresponding appearance.
For the application of some special occasions, existing information gathering product gradually manifests different degrees of disadvantage on the market
End.For example：Remote read head is used in intelligent parking lot Fare Collection System, car owner has been solved and is entered when appearing on the scene closely card taking brush
Card inconvenience and the low problem of efficiency, improve the intellectuality of system.But meanwhile, also occur in that new problem.Such as：Misplaced with car
(front truck waits mandate process or illegal vehicle forbidden to row problem before being parked in banister, now carrys out car again below, when approaching front truck
Remote card in rear car is read, and front truck is illegally let pass)；Also neighboring trace is misread problem and (is existed with the remote vehicle for blocking
When passing through on the track of normally travel, card is read by neighboring trace read head, so that illegal vehicle of leading the way of letting pass).Two above is asked
Inscribe the Card Reader distance that the main cause for occurring is remote read head and be unable to precise control, generally actual Card Reader distance than setting in advance
The Card Reader set is apart from remote much or near a lot.
The content of the invention
It is an object of the invention to provide supporting rfid interrogator and RFID, and RFID read-write method,
The operating distance between read head and card is accurately controlled using low frequency magnetic field information channel, to solve one or many in the prior art
Individual problem.
Realizing the technical scheme of above-mentioned purpose is：
A kind of RFID read-write method, including：
Rfid interrogator modulates low-frequency modulation signal, and is transferred to RFID by low frequency magnetic field information channel；
RFID performs operation according to low-frequency modulation signal, and operating result is led to by superfrequency radio-frequency information
Road returns to rfid interrogator.
In certain embodiments, the low-frequency modulation signal include Card Reader range information, the RFID according to
Card Reader range information sets the dough softening；
The RFID decays according to the dough softening for setting to the low-frequency modulation signal, low after detection decay
The intensity of frequency modulation, when the intensity of detection is more than the magnetic field intensity threshold value for prestoring, holds according to the low-frequency modulation signal
Row corresponding operating.
In certain embodiments, the rfid interrogator modulates low-frequency modulation signal and is transferred to the RFID
Process include：
Produce low frequency carrier signal；
Input modulation orders and modulation data, the low frequency modulations including Card Reader range information are modulated into by low frequency carrier signal
Signal；
Low-frequency modulation signal is amplified, and produces the alternating magnetic field synchronous with the low-frequency modulation signal after amplification；
The RFID performs operation according to low-frequency modulation signal, and operating result is returned into rfid interrogator
Process include：
Low-frequency modulation signal is received by alternating magnetic field；
Low-frequency modulation signal is demodulated, corresponding data information is obtained；
The dough softening is set according to the Card Reader range information in the data message that demodulation is obtained；
The low-frequency modulation signal is decayed according to the dough softening, the intensity of the low-frequency modulation signal after detection decay, in inspection
When surveying result more than the magnetic field intensity threshold value for prestoring, corresponding operating is performed according to the data message that demodulation is obtained, and export operation
As a result；
Produce superfrequency radiofrequency signal；
Superfrequency radiofrequency signal is modulated according to operating result, by the superfrequency radio signal transmission after modulation to institute
State rfid interrogator.
In certain embodiments, the low frequency carrier signal is 10~300KHZ carrier signals；The superfrequency radio frequency letter
Number be 200~800MHZ radiofrequency signals.
In certain embodiments, the RFID reads the letter of memory respective sectors according to low-frequency modulation signal
Breath, is then modulated into result emission of radio frequency signals and returns to the rfid interrogator.
A kind of rfid interrogator, including：
Oscillating signal generator, for producing low frequency carrier signal；
First MCU (microprocessor), for exporting modulation orders and modulation data；
First signal modulator, low frequency is modulated into according to the modulation orders and modulation data by the low frequency carrier signal
Modulated signal；
Low-frequency modulation signal amplifier, for the low-frequency modulation signal to be amplified；
Aerial coil, for produce with amplify after the synchronous alternating magnetic field of low-frequency modulation signal；
Superfrequency wireless receiver, for receiving the superfrequency radiofrequency signal of RFID transmission and being forwarded to first
Demodulator of PM signal PM；And
First demodulator of PM signal PM, by superfrequency radiofrequency signal demodulation, obtains corresponding data information and is transferred to described
First MCU.
In certain embodiments, the low frequency carrier signal is 10~300KHZ carrier signals.
A kind of RFID, including：
Low frequency receiver, for receiving the low-frequency modulation signal that rfid interrogator sends；
Secondary signal demodulator, by low-frequency modulation signal demodulation, obtains corresponding data information and exports；
2nd MCU, according to the Card Reader range information in the data message that demodulation is obtained, generation dough softening programming instruction is simultaneously defeated
Go out；
Programmable attenuator, is set according to the programming that dough softening programming instruction carries out the dough softening, afterwards believes low frequency modulations
Number decay after export；
Signal strength detector, intensity detection is carried out to the low-frequency modulation signal after decay, is more than in testing result and is prestored
Magnetic field intensity threshold value when, notify that the 2nd MCU performs corresponding operating, the 2nd MCU according to the data message that obtains of demodulation
Output operating result；
Ultrahigh-frequency signal transmitter；And
Ultrahigh-frequency signal occurs and modulator, for producing superfrequency radiofrequency signal, and exported according to the 2nd MCU
Operating result is modulated to superfrequency radiofrequency signal, and the superfrequency radiofrequency signal after modulation is sent out by the ultrahigh-frequency signal
Emitter is launched.
In certain embodiments, the superfrequency radiofrequency signal is 200~800MHZ radiofrequency signals.
In certain embodiments, also including the memory of the operating result for storing the 2nd MCU outputs.
The beneficial effects of the invention are as follows：
Present invention introduces low frequency magnetic field information channel, (as low frequency magnetic field is sent out the characteristics of using low frequency magnetic field information channel
Cause trouble reduces rapidly with the distance increase low frequency signal intensity of receiving terminal), the operating distance between read head and card is carried out accurately
Control.By to setting the read-write operation distance that programmable attenuator is adjusted between card and read head on card, it is to avoid mesh
Preceding actual Card Reader distance than the Card Reader that is previously set apart from it is remote much or near defect a lot.
Brief description of the drawings
Fig. 1 is the flow chart of the RFID read-write method of one embodiment of the present invention；
Fig. 2 is the structure chart of the rfid interrogator of one embodiment of the present invention；
Fig. 3 is the structure chart of the RFID of one embodiment of the present invention；
Fig. 4 is the fundamental diagram of programmable attenuator in one embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is described in further detail.
RFID read-write method of the invention, based on supporting rfid interrogator and RFID, refers to Fig. 1, bag
Include：
Step S1, rfid interrogator modulation low-frequency modulation signal, and RFID electricity is transferred to by low frequency magnetic field information channel
Subtab, specifically includes step：
Step S11, rfid interrogator produces low frequency (10~300KHZ) carrier signal.I.e.：Low frequency magnetic field information is introduced to lead to
Road (by producing synchronous with low-frequency modulation signal alternating magnetic field realization), the characteristics of using low frequency magnetic field information channel (with
The distance that low frequency magnetic field occurs end and receiving terminal increases low frequency signal intensity and reduces rapidly) realize the present invention.In the present embodiment,
The low frequency carrier signal is 10~300KHZ carrier signals.
Step S12, modulation orders and modulation data are input into rfid interrogator, and rfid interrogator is according to modulation orders and tune
Low frequency carrier signal is modulated into data processed the low-frequency modulation signal for including Card Reader range information；Obviously, Card Reader range information
From modulation data.
Step S13, rfid interrogator amplifies low-frequency modulation signal, and produces synchronous with the low-frequency modulation signal after amplifying
Alternating magnetic field, realize being transmitted by low frequency magnetic field information channel with this.
Step S2, RFID performs operation according to low-frequency modulation signal, and operating result is penetrated by superfrequency
Frequency information channel returns to rfid interrogator.Specifically include step：
Step S21, when the distance of RFID and rfid interrogator is less than information transfer coverage between them
When (in the magnetic field intensity effective range that rfid interrogator is produced), RFID receives low frequency modulations and believes by alternating magnetic field
Number；Due to being to use low channel from read head toward the information channel in card direction, according to its feature, detection is easy on card
To the power change of low-frequency magnetic field signal.
Step S22, RFID demodulates low-frequency modulation signal, obtains corresponding data message.
Step S23, Card Reader range information of the RFID in the data message that obtains of demodulation sets the dough softening.
Specifically：
Realized by programmable attenuator, its operation principle is as shown in Figure 4：The signal that will be received passes through resistance (R1-R4)
The mode of partial pressure is decayed, and resistance (R1-R4) scalar quantization realizing PLC technology.I.e.：In circuit design
The resistance parameter of the divider resistance for choosing, just can close or disconnect and realize to input signal by adjusting switch (S1-S3)
(INPUT) differential declines degree, and reach dough softening relational implementation Card Reader range information setting corresponding with Card Reader distance unification
The purpose of the dough softening.In Fig. 4, output represents output signal, and GND represents ground connection.
Step S24, RFID decays low-frequency modulation signal according to the dough softening, and detects that the low frequency after decay is adjusted
The intensity of signal processed, when testing result is more than the magnetic field intensity threshold value for prestoring, phase is performed according to the data message that demodulation is obtained
Should operate (such as：The information (low-frequency modulation signal) of the reading memory transmitted according to read head, is read out memory respective sectors
Then radio-frequency transmissions are modulated into and return to read head.Also write information into memory.Etc. ...), and export operating result.So as to logical
The dough softening is overregulated, is realized to the adjustable of the read-write operation distance between card and read head, carry out precise control.
Step S25, RFID produces superfrequency (200~800MHZ) radiofrequency signal.
Step S26, is modulated according to operating result to superfrequency radiofrequency signal, by the superfrequency radiofrequency signal after modulation
It is transferred to rfid interrogator.I.e.：Signal is returned to by rfid interrogator by superfrequency radio-frequency information passage, whole read-write is realized
Operating process.
In order to realize the above method, present invention also offers supporting rfid interrogator and RFID, narration is such as
Under：
Refer to Fig. 2, rfid interrogator of the invention, including：Oscillating signal generator 11, a MCU 12,
One signal modulator 13, low-frequency modulation signal amplifier 14, aerial coil 15, the signal solution of superfrequency wireless receiver 16 and first
Adjust device 17.Wherein：
Oscillating signal generator 11, the first signal modulator 13, low-frequency modulation signal amplifier 14 and aerial coil
15 are sequentially connected in series.Superfrequency wireless receiver 16, the first demodulator of PM signal PM 17, a MCU 12 and the first signal modulator 13 according to
Secondary concatenation.
Oscillating signal generator 11 produces low frequency carrier signal, and is sent to the first signal modulator 13.First MCU
12 export modulation orders and modulation data to the first signal modulator 13, and these modulation orders and modulation data can be pre-stored in fortune
Program in row, it is also possible to by being manually input into by a MCU 12.
Low frequency carrier signal is modulated into low frequency modulations letter by the first signal modulator 13 according to modulation orders and modulation data
Number (in low-frequency modulation signal include Card Reader range information, from modulation data), and it is sent to low-frequency modulation signal amplifier 14
Amplify.Aerial coil 15 produces the alternating magnetic field synchronous with the low-frequency modulation signal after amplification.Now, RFID is once
Around into aerial coil 15 in (magnetic field intensity effective range), the RFID will be held by receiving low-frequency modulation signal
Row associative operation is (such as：The information of the reading memory transmitted according to read head, is read out memory respective sectors and then is modulated into
Radio-frequency transmissions return to read head.Also write information into memory.Etc. ...), its operating result returns to RFID read-write with superfrequency
Device.
Superfrequency wireless receiver 16 receives the superfrequency radiofrequency signal (operating result) of RFID transmission, forwarding
Realize demodulating to the first demodulator of PM signal PM 17, the corresponding data information transfer for obtaining gives a MCU 12.
Refer to Fig. 3, RFID of the invention, including：Low frequency receiver 21, secondary signal demodulator 22,
Two MCU 23, programmable attenuator 24, signal strength detector 25, ultrahigh-frequency signal transmitter 26, ultrahigh-frequency signal occur and
Modulator 27 and memory 28.Wherein：
On the one hand, low frequency receiver 21 connects the 2nd MCU 23 by secondary signal demodulator 22.
On the other hand, low frequency receiver 21, programmable attenuator 24, signal strength detector 25, the 2nd MCU 23, extra-high
The generation of frequency signal and modulator 27 and ultrahigh-frequency signal transmitter 26 are sequentially connected in series.Meanwhile, the 2nd MCU 23 is also connected with may be programmed
Attenuator 24.
Low frequency receiver 21 receives the low frequency modulations that rfid interrogator sends by the alternating magnetic field that aerial coil 15 is produced
Signal, and sent low-frequency modulation signal by two-way.Low-frequency modulation signal is solved by secondary signal demodulator 22 all the way
Adjust, the data information transfer for obtaining is processed (according to the Card Reader distance in the data message that demodulation is obtained to the 2nd MCU 23
Information, generates dough softening programming instruction and exports to programmable attenuator 24).Another road low-frequency modulation signal is declined by programmable
Subtract arriving signal intensity detector 25 after device 24 is decayed, the intensity detection of low-frequency magnetic field signal is carried out, if testing result is more than
During the magnetic field intensity threshold value for prestoring, signal strength detector 25 notifies that the 2nd MCU 23 performs corresponding operating (such as：According to read head
The information of the reading memory for transmitting, is read out the information of memory respective sectors, is then modulated into radio-frequency transmissions and returns to read head.
Also write information into memory.Etc. ...), and operating result is exported, do not do any operation otherwise.The operating result of output
On the one hand memory 28 is stored in, on the one hand exports and occur to ultrahigh-frequency signal and modulator 27.
Ultrahigh-frequency signal occurs and modulator 27 produces superfrequency radiofrequency signal, and the operation exported according to the 2nd MCU23
Result is modulated to the superfrequency radiofrequency signal, finally launches the superfrequency radiofrequency signal after modulation by ultrahigh-frequency signal
Device 26 is launched, and is received by superfrequency wireless receiver 16.
And Card Reader distance regulation is realized (see above-mentioned) by programmable attenuator 24.2nd MCU 23 is obtained according to demodulation
Data message in Card Reader range information, generation dough softening programming instruction simultaneously export to programmable attenuator 24 (according to demodulation
The data message for obtaining is a kind of information of set form, and the information of Card Reader distance is just positioned at corresponding locations, the 2nd MCU
As long as individually taking out this data and being transferred to programmable attenuator.).Programmable attenuator 24 refers to according to dough softening programming
The programming that order carries out the dough softening is set, and to be adjusted to respective attenuation degree, the low frequency modulations of low frequency receiver 21 will be received from afterwards
Exported after signal attenuation to signal strength detector 25.The signal of dough softening entering signal intensity detector 25 higher is weaker,
Card Reader distance is nearer, and vice versa.
The above is only one embodiment of the present invention, it is noted that to those skilled in the art,
Without departing from the concept of the premise of the invention, some similar deformations and improvement can also be made, these also should be regarded as this
Within the protection domain of invention.
Claims (7)
1. a kind of RFID read-write method, it is characterised in that including：
Rfid interrogator modulates low-frequency modulation signal, and is transferred to RFID by low frequency magnetic field information channel；
RFID performs operation according to low-frequency modulation signal, and operating result is returned by superfrequency radio-frequency information passage
Back to rfid interrogator；
The low-frequency modulation signal includes Card Reader range information, and the RFID sets according to Card Reader range information and decays
Degree；
The RFID decays according to the dough softening for setting to the low-frequency modulation signal, and the low frequency after detection decay is adjusted
The intensity of signal processed, when the intensity of detection is more than the magnetic field intensity threshold value for prestoring, phase is performed according to the low-frequency modulation signal
Should operate.
2. RFID read-write method according to claim 1, it is characterised in that
Rfid interrogator modulation low-frequency modulation signal is simultaneously transferred to the process of the RFID and includes：
Produce low frequency carrier signal；
Input modulation orders and modulation data, low frequency carrier signal is modulated into the low frequency modulations letter including Card Reader range information
Number；
Low-frequency modulation signal is amplified, and produces the alternating magnetic field synchronous with the low-frequency modulation signal after amplification；
The RFID performs operation according to low-frequency modulation signal, and operating result is returned to the mistake of rfid interrogator
Journey includes：
Low-frequency modulation signal is received by alternating magnetic field；
Low-frequency modulation signal is demodulated, corresponding data information is obtained；
The dough softening is set according to the Card Reader range information in the data message that demodulation is obtained；
The low-frequency modulation signal is decayed according to the dough softening, the intensity of the low-frequency modulation signal after detection decay is tied in detection
When fruit is more than the magnetic field intensity threshold value for prestoring, corresponding operating is performed according to the data message that demodulation is obtained, and export operating result；
Produce superfrequency radiofrequency signal；
Superfrequency radiofrequency signal is modulated according to operating result, by the superfrequency radio signal transmission after modulation to described
Rfid interrogator.
3. RFID read-write method according to claim 2, it is characterised in that the low frequency carrier signal is 10~300KHZ
Carrier signal；The superfrequency radiofrequency signal is 200~800MHZ radiofrequency signals.
4. RFID read-write method according to claim 1, it is characterised in that the RFID is according to low frequency modulations
The information of signal-obtaining memory respective sectors, is then modulated into result emission of radio frequency signals and returns to the RFID read-write
Device.
5. a kind of RFID, it is characterised in that including：
Low frequency receiver, for receiving the low-frequency modulation signal that rfid interrogator sends；
Secondary signal demodulator, by low-frequency modulation signal demodulation, obtains corresponding data information and exports；
2nd MCU, according to the Card Reader range information in the data message that demodulation is obtained, generates dough softening programming instruction and exports；
Programmable attenuator, is set according to the programming that dough softening programming instruction carries out the dough softening, and low-frequency modulation signal declines afterwards
Exported after subtracting；
Signal strength detector, intensity detection is carried out to the low-frequency modulation signal after decay, and the magnetic for prestoring is more than in testing result
During field intensity threshold value, notify that the 2nd MCU performs corresponding operating, the 2nd MCU outputs according to the data message that demodulation is obtained
Operating result；
Ultrahigh-frequency signal transmitter；And
Ultrahigh-frequency signal occurs and modulator, for producing superfrequency radiofrequency signal, and the operation exported according to the 2nd MCU
Result is modulated to superfrequency radiofrequency signal, and the superfrequency radiofrequency signal after modulation is passed through into the ultrahigh-frequency signal transmitter
Launch.
6. RFID according to claim 5, it is characterised in that the superfrequency radiofrequency signal is 200~
800MHZ radiofrequency signals.
7. RFID according to claim 5, it is characterised in that also including defeated for storing the 2nd MCU
The memory of the operating result for going out.
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| CN201410468986.5A CN104217235B (en) | 2014-09-15 | 2014-09-15 | Rfid interrogator, electronic tag and reading/writing method |
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| CN201410468986.5A CN104217235B (en) | 2014-09-15 | 2014-09-15 | Rfid interrogator, electronic tag and reading/writing method |
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| CN113965919B (en) * | 2021-12-17 | 2022-04-15 | 中移(上海)信息通信科技有限公司 | Information detection method and base station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975758A (en) * | 2006-12-15 | 2007-06-06 | 清华大学 | Radio-frequency card or radio frequency label based on super wideband wireless pulse mode |
| CN101751596A (en) * | 2008-12-18 | 2010-06-23 | 北京泰安特科技有限公司 | Position identification card for downhole personnel in coal mine and card reading mode |
| CN102393897A (en) * | 2011-07-11 | 2012-03-28 | 上海沛宇信息科技有限公司 | Active RFID identification system and control method thereof for accurately reading boundary |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7612674B2 (en) * | 2006-10-27 | 2009-11-03 | Sony Corporation | Radio frequency identification system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1975758A (en) * | 2006-12-15 | 2007-06-06 | 清华大学 | Radio-frequency card or radio frequency label based on super wideband wireless pulse mode |
| CN101751596A (en) * | 2008-12-18 | 2010-06-23 | 北京泰安特科技有限公司 | Position identification card for downhole personnel in coal mine and card reading mode |
| CN102393897A (en) * | 2011-07-11 | 2012-03-28 | 上海沛宇信息科技有限公司 | Active RFID identification system and control method thereof for accurately reading boundary |
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