CN1979520A - Radio-frequency identification method and system - Google Patents
Radio-frequency identification method and system Download PDFInfo
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- CN1979520A CN1979520A CN 200510127650 CN200510127650A CN1979520A CN 1979520 A CN1979520 A CN 1979520A CN 200510127650 CN200510127650 CN 200510127650 CN 200510127650 A CN200510127650 A CN 200510127650A CN 1979520 A CN1979520 A CN 1979520A
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Abstract
The invention provides a RFID method, comprising: when information carrier reaches the first position of a detection region, a sensing unit generates axial compression signal and sends the axial compression signal to upper control unit; the upper control unit sends startup instruction to lower control unit; when the information carrier reaches the second position, the sensing unit generates axial judgment signal and sends the axial judgment signal to the upper control unit; when receiving the axial judgment signal, the upper control unit sends tag inquiring instruction to the lower control unit; when receiving the tag inquiring instruction, the lower control unit receives radio frequency data of the information carrier by the radio frequency data switching unit and antenna unit and then sends the radio frequency data to the upper control unit. And the invention also provides a RFID system, comprising: sensing unit, upper control unit, lower control unit, radio frequency data switching unit and antenna unit.
Description
Technical field
The present invention relates to field of radio frequency identification, relate in particular to a kind of method and system of radio-frequency (RF) identification.
Background technology
Radio-frequency (RF) identification (RFID) technology is a kind of contactless recognition technology, and its ultimate principle is to utilize the coupling of radiofrequency signal and space thereof, transport property, realize to static or mobile in the machine recognition of article to be identified.
Radio-frequency recognition system generally is made up of two parts, i.e. electronic tag and reader.Between electronic tag and reader, realize the space coupling of radiofrequency signal, in coupling channel,, realize the transmission of energy, the exchange of data according to sequential relationship.During system works, reader sends microwave inquiry energy signal, after electronic tag is received microwave inquiry energy signal, with the rectification of a part of microwave inquiry energy signal is circuit working in the DC power supply subtab, and the data message modulation back reflection that another part microwave inquiry energy signal is preserved in the electronic tag returns reader.Reader receives the am signals of reflected back, therefrom extracts the sign data message of preserving in the electronic tag.
But in the prior art, when REID is applied to vehicle management, have certain problem especially: in existing information of vehicles recognition system, the technical scheme that is adopted utilizes interrupt mode that the vehicle through a certain zone is monitored.Promptly when a car passes through specified point, produce a pulse signal, the information of vehicles recognition system begins the rf data of reading data media immediately.But can be subjected to surrounding environment or electromagnetic field noise owing to do like this, frequently carry out data read, cause system misoperation thereby cause system often to be triggered.
In addition, existing systems all only uses single antenna as port, and after the antenna launching failure, system is just paralysis immediately also, so system reliability is relatively poor.
Summary of the invention
The present invention be directed to the system that occurs in the prior art and be easy to generate maloperation, the relatively poor problem of reliability, purpose provides a kind of accuracy height, the radio-frequency identification method of reliable operation and system.
Radio-frequency identification method provided by the invention comprises: when information carrier arrived the primary importance of surveyed area, described sensing cell produced the last item signal, and described last item signal is sent to upper control module; Upper control module sends enabled instruction to the next control module; When information carrier arrived the second place of surveyed area, described sensing cell produces declared axis signal, and declared axis signal and send to upper control module described; After upper control module receives to declare axis signal, then the inquiry tag instruction is sent to the next control module; After the next control module receives inquiry tag instruction, receive the rf data of information carrier, and described rf data is sent to upper control module by described rf data crosspoint and antenna element.
Radio-frequency recognition system provided by the invention comprises: sensing cell, described sensing cell comprises first sensor, first signal deteching circuit, second sensor, secondary signal testing circuit, wherein, first sensor is used for producing the last item signal when the sensitive information carrier arrives primary importance, second sensor is used for producing when the sensitive information carrier arrives the second place declares axis signal, first signal deteching circuit and secondary signal testing circuit be used for respectively the last item signal and declare that axis signal amplifies, filtering and shaping; Upper control module is used for sending enabled instruction to the next control module after receiving last item instruction, receive declare axis signal after, send the inquiry tag instruction to the next control module, and receive rf data from the next control module; The next control module is used to receive enabled instruction, inquiry tag instruction from upper control module, and the rf data that passes through described rf data crosspoint and antenna element reception information carrier, and described rf data is sent to upper control module; The rf data crosspoint is used for armed microwave signal is sent to antenna element, and the rf data from antenna element is carried out demodulation; Antenna element is used for to information carrier launched microwave signal or accepts rf data from information carrier.
In described radio-frequency recognition system, the rf data crosspoint comprises frequency locking circuit, power synthesis circuit, demodulator circuit, input and output isolated part, and wherein, the frequency locking circuit is used to export the microwave signal of characteristic frequency; Power synthesis circuit is used to amplify the power of microwave signal; Demodulator circuit is used for the rf data that receives is carried out demodulation; The input and output isolated part is used to isolate the microwave signal of output.Further, antenna element comprises main antenna and emergency antenna.
Utilize radio-frequency identification method provided by the invention and system, owing to be based on above-mentioned last item signal and declare that axis signal makes for the information acquisition of information carrier, come down to utilize the square wave of a certain width to replace that individual pulse triggers the signal that rf data is gathered in the prior art, so just reduced interference, noise influence, also just reduced the generation of system misoperation system.To can gathering exactly to information of vehicles,
In addition, utilize, increased the reliability of system works by self check and two-antenna configuration to each ingredient of system.
Description of drawings
Fig. 1 is the embodiment process flow diagram of radio-frequency identification method of the present invention.
Fig. 2 is the example structure figure of radio-frequency recognition system of the present invention.
Fig. 3 is the process flow diagram that radio-frequency recognition system of the present invention carries out self check.
Embodiment
Fig. 1 is the embodiment process flow diagram of radio-frequency identification method of the present invention.In the present embodiment, after the system power-up, upper control module just is in starting state, and after system initialization, described upper control module promptly is in the monitor state to sensing cell, and described sensing cell then is in powering state always.
In step 110, in the time of the primary importance of information carrier by the specific region (for example, during the entry position of the automobile that magnetic stripe is housed on the wheel shaft by the inspection post), the first sensor of sensing cell generates an electric signal.First signal deteching circuit to described electric signal amplify, filtering, and carry out shaping, for example, the last item signal is adjusted into the square wave of 5V level, become the last item signal.Afterwards, described last item signal is sent to upper control module by serial line interface.
In step 120, upper control module is after receiving the last item signal, promptly send enabled instruction to the next control module, described enabled instruction is used to start other and the relevant equipment of rf data identification, for example the next control module, rf data crosspoint and antenna element are powered up, and the said equipment is carried out initialization and self check.Simultaneously, upper control module is declared the arrival of axis signal in wait.
In step 130, when information carrier arrives the second place of surveyed area (for example, the running car track pitch that magnetic stripe is housed on the wheel shaft is when 5 meters, exit position in inspection post), second sensor of described sensing cell has produced another electric signal, through the secondary signal testing circuit to described electric signal amplification, filtering and shaping after, form and declare axis signal.And declare axis signal and send to upper control module described.
In step 140, when upper control module receive declare axis signal after, if upper control module needs the rf data on the reading data media, then upper control module sends to the next control module with the inquiry tag instruction, so that the next control module can obtain described rf data.Communication between upper control module and the next control module is undertaken by the particular communication interface, and described communication interface can be any in the communication modules such as RS232 transmission chip, RS485 transmission chip, light delivery module.
In step 150, the next control module will send to antenna element by the microwave signal after rf data crosspoint frequency locking, the power amplification after receiving the inquiry tag instruction by communication interface.And by as the antenna element of launch terminal to information carrier launched microwave signal.
In step 160, electronic tag on the information carrier is after receiving microwave signal, with a part of microwave signal rectification is circuit working in the DC power supply subtab, feeds back to radio-frequency recognition system after the data message modulation that another part microwave signal is preserved in the electronic tag.Radio-frequency recognition system receives the am signals of reflected back, therefrom extracts the sign data message of preserving in the electronic tag.In the present embodiment, by the rf data of antenna element reception, by the rf data crosspoint described rf data is carried out demodulation, and the rf data after the demodulation is sent to the next control module from information carrier;
In step 170, the next control module sends to upper control module with received rf data by communication interface.Thereby make upper control module obtain the rf data on the information carrier, and and then can utilize data management software, on upper control module to the data of being gathered store, add up, show, processing such as retrieval, ordering.
Fig. 2 is the example structure figure of radio-frequency recognition system of the present invention.Described vehicle radio-frequency recognition system comprises: sensing cell 10, upper control module 20, the next control module 30, rf data crosspoint 40 and antenna element 50.
Described sensing cell 10 is realized by two-way sensor and two paths of signals testing circuit, wherein sensor can be any one in Magnetic Sensor, photoelectric sensor or the pressure transducer, and signal deteching circuit then comprises amplifying circuit, filtering circuit and shaping circuit.Wherein, amplifying circuit electric signal that sensor is gathered carries out power amplification; Filtering circuit extracts at the signal of a certain special frequency band, thus elimination the signal of other frequency bands, in the present invention, preferably, extracting frequency by filtering circuit is the signal of 1-1000kHz; Shaping circuit carries out shaping with the signal of being gathered, and for example arrangement is square wave, sine wave, triangular wave or the like.In an embodiment of the present invention, preferably, be square wave with declaring the axis signal arrangement with the last item signal.
Upper control module 20 can use equipment such as PC, server as control module at the center that is conduct control in the radio-frequency recognition system.Preferably, in the present embodiment, adopt industrial computer as upper control module, industrial computer has communication port such as RS232/422/485, USB, optical communications module, so that communicate with other control modules or the sensing cell 10 in the external world; Industrial computer also has computing machines such as common CPU, internal storage, external memory storage configuration device is often arranged, so that carry out data processing operation.
Described the next control module 30 can be the computing equipment identical with upper control module, as PC, server, industrial computer etc., also can be other hardware logic unit in addition, in the present embodiment, the preferred single-chip microcomputer that adopts is as the next control module 30, described can integrating with rf data crosspoint 40 and antenna element 50 is with the form realization of fixed or portable radio-frequency identification equipment.Described single-chip microcomputer also has the interface of communicating by letter with upper control module 20, and by communication interface, single-chip microcomputer receives instruction from upper control module 20, thereby can receive the rf data of information carrier 60.
In the present embodiment, described rf data crosspoint comprises frequency locking circuit, power synthesis circuit, imput output circuit, described frequency locking circuit realizes that by phaselocked loop phaselocked loop is the common frequency control device in this area, can realize by existing multiple integrated circuit (as CD4046).Power synthesis circuit is a kind of power amplification circuit, adopts the two-stage two-way synthetic, and the first order is divided into signal two-way afterwards for amplifying, and the amplification back is synthetic respectively.The input and output isolated part then adopts the ferrite processing device of certain frequency range.After single-chip microcomputer is accepted instruction, send instruction for the frequency locking circuit, locking frequency is opened power discharging device again, and is synthetic through the two-stage two-way, reach predetermined output power after, isolate the output microwave signal through ferrite.
Described antenna element comprises two pairs of antennas, and one as main antenna, and one as emergency antenna.Radiofrequency signals of received RF exchanges data unit output or accept the radiofrequency signal of input all.When in the process of antenna unit self check or in the process in exchanges data, when detecting main antenna and break down, enable the reception that emergency antenna carries out rf data.
Fig. 3 is the process flow diagram that radio-frequency recognition system of the present invention carries out self check.In order to improve vehicle radio-frequency recognition system reliability of operation, after upper control module starts, respectively sensing cell, the next control module, rf data crosspoint and antenna element are carried out self check.
Sensing cell carries out self check, if self check is passed through, then the sensing cell operate as normal begins to monitor the last item signal, if self check is not passed through, then sensing cell quits work, and the output failure alarm signal.Described alerting signal can be the flicker of light emitting diode or the voice of ringing or recording in advance of hummer.
The next control module carries out self check, if self check is passed through, then the next control module is waited for the enabled instruction from upper control module, if self check is not passed through, then the next control module quits work, and the output failure alarm signal;
The rf data crosspoint carries out self check, if self check is passed through, then the rf data crosspoint is waited for the instruction of the next control module, if self check is not passed through, then the rf data crosspoint quits work, and the output failure alarm signal;
Antenna element carries out self check, if self check is passed through, then antenna element is waited for the microwave signal from the rf data crosspoint, if self check is not passed through, then antenna element quits work, and the output failure alarm signal.Further, when antenna element carries out self check, if main antenna launching failure wherein then starts emergency antenna.
It may be noted that enforcement of the present invention is not limited to the foregoing description,, only otherwise break away from spirit of the present invention, also belong to protection scope of the present invention if other forms of modification arranged.
Claims (8)
1. a radio-frequency identification method is characterized in that, comprises
A. when information carrier arrived the primary importance of surveyed area, described sensing cell produced the last item signal, and described last item signal is sent to upper control module;
B. upper control module sends enabled instruction to the next control module;
C. when information carrier arrived the second place of surveyed area, described sensing cell produces declared axis signal, and declared axis signal and send to upper control module described;
D. after upper control module receives to declare axis signal, then the inquiry tag instruction is sent to the next control module;
E. after the next control module receives inquiry tag instruction, receive the rf data of information carrier, and described rf data is sent to upper control module by described rf data crosspoint and antenna element.
2. method according to claim 1 is characterized in that, between step b and c, after the next control module receives enabled instruction, then starts rf data crosspoint and antenna element.
3. method according to claim 1 is characterized in that, at step e, the rf data that receives information carrier by described rf data crosspoint and antenna element further comprises:
By the rf data crosspoint microwave signal to be sent is sent to antenna element, and by antenna element to information carrier launched microwave signal;
Receive rf data by antenna element,, and described rf data sent to the next control module by rf data crosspoint demodulation rf data from information carrier;
The next control module sends to upper control module with received rf data.
4. method according to claim 1 is characterized in that, before step a, also comprises:
Sensing cell carries out self check, if self check is passed through, then sensing cell is waited for the last item signal, if self check is not passed through, then sensing cell quits work and exports failure alarm signal;
The next control module carries out self check, if self check is passed through, then the next control module is waited for enabled instruction, if self check is not passed through, then the next control module quits work and exports failure alarm signal;
The rf data crosspoint carries out self check, if self check is passed through, then the rf data crosspoint is waited for the instruction of the next control module, if self check is not passed through, then the rf data crosspoint quits work and exports failure alarm signal;
Antenna element carries out self check, if self check is passed through, then antenna element is waited for the microwave signal from the rf data crosspoint, if self check is not passed through, then antenna element quits work and exports failure alarm signal.
5. method according to claim 4 is characterized in that, when antenna element carries out self check, if the main antenna fault then starts emergency antenna.
6. a radio-frequency recognition system is characterized in that, comprising:
Sensing cell, described sensing cell comprises first sensor, first signal deteching circuit, second sensor, secondary signal testing circuit, wherein, first sensor is used for producing the last item signal when the sensitive information carrier arrives primary importance, second sensor is used for producing when the sensitive information carrier arrives the second place declares axis signal, first signal deteching circuit and secondary signal testing circuit be used for respectively the last item signal and declare that axis signal amplifies, filtering and shaping;
Upper control module is used for sending enabled instruction to the next control module after receiving last item instruction, receive declare axis signal after, send the inquiry tag instruction to the next control module, and receive rf data from the next control module;
The next control module is used to receive enabled instruction, inquiry tag instruction from upper control module, and the rf data that passes through described rf data crosspoint and antenna element reception information carrier, and described rf data is sent to upper control module;
The rf data crosspoint is used for armed microwave signal is sent to antenna element, and the rf data from antenna element is carried out demodulation;
Antenna element is used for to information carrier launched microwave signal or accepts rf data from information carrier.
7, system according to claim 6 is characterized in that, described rf data crosspoint comprises frequency locking circuit, power synthesis circuit, demodulator circuit, input and output isolated part, wherein,
The frequency locking circuit is used to export the microwave signal of characteristic frequency;
Power synthesis circuit is used to amplify the power of microwave signal;
Demodulator circuit is used for the rf data that receives is carried out demodulation;
The input and output isolated part is used to separate input and the microwave signal of exporting.
8. system according to claim 6 is characterized in that described antenna element comprises main antenna and emergency antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510127650 CN1979520A (en) | 2005-12-06 | 2005-12-06 | Radio-frequency identification method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510127650 CN1979520A (en) | 2005-12-06 | 2005-12-06 | Radio-frequency identification method and system |
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| CN1979520A true CN1979520A (en) | 2007-06-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101377820B (en) * | 2007-08-31 | 2012-05-30 | 西门子公司 | Method for searching label in radio frequency recognition system and reader-writer |
| CN101743570B (en) * | 2007-07-24 | 2012-06-20 | 西门子公司 | Verification unit for conducting a time-related validity check |
| CN113611027A (en) * | 2021-07-30 | 2021-11-05 | 北京晶品赛思科技有限公司 | Warehouse-out detection method, system, equipment and readable storage medium |
-
2005
- 2005-12-06 CN CN 200510127650 patent/CN1979520A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101743570B (en) * | 2007-07-24 | 2012-06-20 | 西门子公司 | Verification unit for conducting a time-related validity check |
| CN101377820B (en) * | 2007-08-31 | 2012-05-30 | 西门子公司 | Method for searching label in radio frequency recognition system and reader-writer |
| CN113611027A (en) * | 2021-07-30 | 2021-11-05 | 北京晶品赛思科技有限公司 | Warehouse-out detection method, system, equipment and readable storage medium |
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