CN102468988A - Device for automatically detecting signal protocol type in ISO/IEC14443 protocol - Google Patents
Device for automatically detecting signal protocol type in ISO/IEC14443 protocol Download PDFInfo
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Abstract
The invention discloses a device for automatically detecting the type of a signal protocol in an ISO/IEC14443 protocol, which comprises a radio frequency module, a digital signal processing module and a data processing module, wherein the radio frequency module is used for receiving a radio frequency signal with data information and decoding a digital signal according to the ISO/IEC14443 protocol; the automatic identification module is used for sampling the digital signals generated by the radio frequency module by adopting clock signals, if a certain number of continuous logic 0 are acquired, the currently received radio frequency signals are considered to be of a type B protocol, and otherwise, the currently received radio frequency signals are defaulted to be of a type A protocol; under the control of the automatic identification module, the output signal selection module selects one of the signals decoded by the TypeA decoding module and the TypeB decoding module as an output signal. The invention can automatically detect the signals of the type of the TypeA protocol and the type of the TypeB protocol on the same chip, realizes the compatibility of the type of the TypeA protocol and the type of the TypeB protocol on the same chip, and improves the application flexibility of the non-contact card.
Description
Technical field
The present invention relates to field of radio frequency identification, particularly relate to a kind of device that uses digital circuit to detect TypeA and two kinds of protocol type signals of TypeB in ISO/IEC 14443 agreements automatically.
Background technology
Because the fast development of large scale integrated circuit, the volume of radio frequency identification (Radio FrequencyIdentification RFID) system dwindles greatly, makes the RFID technology begin to get into the stage of large-scale application, becomes a kind of automatic identification technology of maturation.
The RFID technology is different with the contact technology, is to utilize RF-wise to carry out contactless two-way communication, to reach identifying purpose and swap data.Just can not accomplish identification between the radio-frequency card of rfid system and the card reader, so it can use in the occasion widely, show out huge commercial value and social value through contact.
REID is that the information utilizing radiofrequency signal to pass through space coupling (alternating magnetic field or electromagnetic field) the contactless information transmission of realization and pass through to be transmitted reaches the identifying purpose technology.Radio-frequency recognition system is made up of electronic tag (RF tag) and reader usually.The electronic data that has certain format in the electronic tag, normal with this sign property information as article to be identified.Reader and electronic tag can be by the communication protocol transinformations of agreement, and common situation is to send order by reader to electronic tag, and electronic tag is given reader according to the order of the reader of receiving with the sign property returning data of internal memory.Another main performance index of radio-frequency recognition system is a reading distance, is also referred to as operating distance.On low frequency 125kHz, high frequency 13.56MHz frequency, generally all adopt passive label, operating distance is about 10～30 centimetres.At the hyperfrequency uhf band, the operating distance of passive label can reach 3～10 meters.
The RFID typical application comprises: be used for storehouse management, production line automation, commodity sale in logistics field; Be used for container and parcel management, expressway tol lcollection and non-parking charge at traffic and transport field; Management and the pet, the wild animal that are used for flock of sheep, fish, fruit etc. in farming, animal husbandry and fishery are followed the tracks of; Be used for pharmaceutical production, patient nursing, medical waste tracking in medical industry; The visualized management that is used for parts and stock in manufacturing industry.Especially E-Passport, electronic ID card etc. are used for the gate inhibition, are open to the custom and maximum field that the domestic especially present RFID of the certificate of identity recognition function uses, also are the successful RFID applications of comparison.All kinds of gate inhibitions, be open to the custom, the certificate of traffic etc. can use the RFID technology to realize effective identity verification and false proof, and realize convenient-to-running functions such as management, location.
At present, the UbiquitousID of ISO/IEC 18000, U.S. EPC Global, Japan is in the standard of formulating and promote oneself respectively.Each standards system not only coding scheme is not quite similar, and the use of frequency is also different; Even same frequency range is also variant on interface, the implementation method aloft, add various countries' radio control difference, the RFID of reservation uses frequency range, and possibility is consistent.More than various skimble-scamble standards systems use to RFID globalization and brought numerous difficulties.Even ISO/IEC 14443 agreements the most commonly used also are divided into two kinds of protocol types of TypeA and TypeB.In the present contactless card, great majority are only supported a kind of in TypeA or the TypeB agreement; Even two kinds of protocol types support that all great majority also are to be configured in advance, confirm that which kind of protocol type carries out work.Though realizing of having detected two kinds of protocol types of TypeA and TypeB automatically, by Realization of Analog Circuit, its shortcoming is the influence that receives factors such as noise jamming easily, causes identification error.
Summary of the invention
The technical problem that the present invention will solve provides the device of signaling protocol type in a kind of automatic detection ISO/IEC 14443 agreements; Make and to detect TypeA and two kinds of protocol types of TypeB on the same chip automatically, on same chip, realize compatible TypeA and two kinds of agreements of TypeB.
For solving the problems of the technologies described above, the device of signaling protocol type in automatic detection ISO/IEC 14443 agreements of the present invention comprises:
Radio frequency (RF) module is used to receive the radiofrequency signal with data message, and demodulates digital signal according to the ISO/IEC14443 agreement;
Automatic identification module; Adopt clock signal that the digital signal that said radio-frequency module produces is sampled; If collect continuous " logical zero " of some, think that then the current radiofrequency signal that receives is the TypeB protocol type, otherwise be defaulted as the TypeA protocol type;
The TypeA decoder module when automatic identification module thinks that the current radiofrequency signal that receives is the TypeA protocol type, is decoded according to the TypeA agreement to the said radiofrequency signal that receives;
The TypeB decoder module when automatic identification module thinks that the current radiofrequency signal that receives is the TypeB protocol type, is decoded according to the agreement of TypeB to the said radiofrequency signal that receives;
The output signal selection module under the control of said automatic identification module, is selected a conduct output signal in TypeA decoder module and the decoded signal of TypeB decoder module.
The present invention adopts digital circuit, according to the radiofrequency signal of current input, detects automatically and judges that the radiofrequency signal of being imported is the typeA protocol type that belongs to the ISO/IEC14443 agreement, still belongs to the typeB protocol type; Efficiently solve on the same chip the automatic detection problem of typeA and two kinds of protocol types of typeB in the ISO/IEC14443 agreement, can compatible typeA and two kinds of agreements of typeB on same chip; Use for the design of product and to have brought facility, increase the versatility of product, improve competitiveness of product.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the signal air interface oscillogram of TypeA protocol type in the ISO/IEC14443 agreement;
Fig. 2 is the signal SOF oscillogram of TypeA protocol type in the ISO/IEC14443 agreement;
Fig. 3 is the signal air interface oscillogram of TypeB protocol type in the ISO/IEC14443 agreement;
Fig. 4 is the signal SOF oscillogram of TypeB protocol type in the ISO/IEC14443 agreement;
Fig. 5 is the structured flowchart of an embodiment of device according to the invention.
Embodiment
Referring to Fig. 5, in one embodiment of this invention, the device of signaling protocol type comprises in said automatic detection ISO/IEC 14443 agreements: RF module 110; Automatic identification module 120; TypeA decoder module 130, TypeB decoder module 140, output signal selection module 150.
Referring to shown in Figure 2; The radiofrequency signal of TypeA protocol type in the ISO/IEC14443 agreement; Its start frame SOF is that the bit period that a preceding half period modulation is arranged (promptly has only a bit period; And produce a low level groove in preceding half period of bit period), and system can't provide clock between modulation period.
In conjunction with shown in Figure 4, the radiofrequency signal of TtypeB protocol type in the ISO/IEC14443 agreement, its start frame SOF scope are at 12～14 bit periods, and its low level recess width is 10～11 bit periods.Be the radiofrequency signal of TypeB protocol type, its start frame SOF is the logical zero of 10 to 11 bit periods, and the back is followed the logical one of 2 to 3 bit periods again.
Based on above-mentioned difference, can adopt following method to discern the signal of TypeA protocol type and the signal of TypeB protocol type automatically.TypeA is a default protocol type, and when promptly not detecting the signal of TypeB protocol type, enable signal sel_typeA remains height always, enables effectively; If when detecting the signal of TypeB protocol type, enable signal sel_typeA is changed to low, and enable signal sel_typeB is changed to height simultaneously, and sel_typeB enables effectively.
The principle that detects the signal of TypeB protocol type is; The digital signal Npause that the RF module is exported with the rising edge of clock signal clock samples; If adopt 256 logical zeros continuously; To detect be the signal that meets the TypeB protocol type in representative so, and then set enable signal sel_typeB is a high level, and the enable signal of set simultaneously sel_typeA signal is a low level.
Output signal selection module 150; Enable signal sel_typeA according to automatic identification module 120 generations; Decoded signal to TypeA decoder module and TypeB decoder module is selected, and selects one of them as the output signal, and the module that offers the back is handled.
Embodiment one
Fig. 1 is the waveform that meets the radiofrequency signal air interface of TypeA protocol type in the ISO/IEC14443 agreement, and its modulation degree is 100% ASK modulation, and therefore, system can't provide clock during groove.Requiring of the concrete time parameter of waveform shown in Figure 1 is as shown in table 1.
Table 1
When RF module 110 receives signal as shown in Figure 1, demodulate digital signal as shown in Figure 2 and be transferred to automatic identification module 120; Automatically after identification module 120 receives digital signal as shown in Figure 2; Recognition principle according to automatic identification module 120 can be discerned the signal that this signal is a TypeA protocol type in the ISO/IEC14443 agreement automatically; Be high level with enable signal sel_typeA set then, and be transferred to TypeA decoder module 130; After enable signal sel_typeA is high level; TypeA decoder module 130 is started working; Decode according to the agreement of TypeA to the received signal; Be transferred to output signal selection module 150 to decoded signal then, because enable signal sel_typeA is a high level, so output signal selection module 150 selects the decoded signal of TypeA decoder module as the output signal.
Embodiment two
Fig. 3 is the waveform that meets the radiofrequency signal air interface of TypeB protocol type in the ISO/IEC14443 agreement, and its modulation degree is 10% ASK modulation, and therefore, system provides clock during groove.
Requiring of the concrete time parameter of waveform shown in Figure 3 is as shown in table 2.
| t f | Maximum 2 μ s |
| t r | Maximum 2 μ s |
| y | Minimum value 0, maximum a-b |
| h f，h r | Minimum value 0, maximum a-b |
Table 2
When RF module 110 receives signal as shown in Figure 3, demodulate digital signal as shown in Figure 4 and be transferred to automatic identification module 120; Automatically after identification module 120 receives digital signal as shown in Figure 4; Recognition principle according to automatic identification module 120 can be discerned the signal that this signal is a TypeB protocol type among the ISO/IEC14443 automatically; Will set enable signal sel_typeB be high level; Set enable signal sel_typeA is a low level, and is transferred to TypeB decoder module 140; After the sel_typeB signal is high level; TypeB decoder module 140 is started working; Decode according to the agreement of TypeB to the received signal; Be transferred to output signal selection module 150 to decoded signal then, because the sel_typeA signal is a low level, so output signal selection module 150 selects the decoded signal of TypeB decoder module as the output signal.
The present invention can detect the signal of TypeA and two kinds of protocol types of TypeB automatically on same chip, on same chip, realize compatible TypeA and two kinds of agreements of TypeB improving the non-contact card application flexibility.
More than through embodiment and embodiment the present invention has been carried out detailed explanation, but these are not to be construed as limiting the invention.Under the situation that does not break away from the principle of the invention, those skilled in the art also can make many distortion and improvement, and these also should be regarded as protection scope of the present invention.
Claims (1)
1. device that automatically detects signaling protocol type in ISO/IEC 14443 agreements comprises:
Radio-frequency module is used to receive the radiofrequency signal with data message, and demodulates digital signal according to ISO/IEC 14443 agreements;
Automatic identification module; Adopt clock signal that the digital signal that said radio-frequency module produces is sampled; If collect continuous " logical zero " of some, think that then the current radiofrequency signal that receives is the TypeB protocol type, otherwise be defaulted as the TypeA protocol type;
The TypeA decoder module when automatic identification module thinks that the current radiofrequency signal that receives is the TypeA protocol type, is decoded according to the TypeA agreement to the said radiofrequency signal that receives;
The TypeB decoder module when automatic identification module thinks that the current radiofrequency signal that receives is the TypeB protocol type, is decoded according to the agreement of TypeB to the said radiofrequency signal that receives;
The output signal selection module under the control of said automatic identification module, is selected a conduct output signal in TypeA decoder module and the decoded signal of TypeB decoder module.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103577777A (en) * | 2012-07-30 | 2014-02-12 | 北京子衿晨风科技有限公司 | Equipment and method used for analyzing security of radio frequency card |
| CN103106379B (en) * | 2013-01-09 | 2016-03-09 | 北京工业大学 | A kind of non-contact IC card with robustness receives counting method |
| CN110460345A (en) * | 2019-07-29 | 2019-11-15 | 北京中电华大电子设计有限责任公司 | A kind of superelevation baud rate reception circuit parameter detection configuration method |
| CN114124163A (en) * | 2021-11-23 | 2022-03-01 | 广州智慧城市发展研究院 | Decoding method, device and equipment of electronic tag and storage medium |
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| WO2006020144A2 (en) * | 2004-07-15 | 2006-02-23 | Mastercard International Incorporated | Collision detection and avoidance scheme for contactless card payment systems |
| WO2010032594A1 (en) * | 2008-09-19 | 2010-03-25 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
| US20100124258A1 (en) * | 2008-11-20 | 2010-05-20 | Renesas Technology Corp. | Semiconductor device and communication device |
| WO2010118947A1 (en) * | 2009-04-16 | 2010-10-21 | Gemalto Sa | Communication device comprising two chips with a shared communication interface |
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- 2010-11-11 CN CN2010105399999A patent/CN102468988A/en active Pending
Patent Citations (5)
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| WO2006020144A2 (en) * | 2004-07-15 | 2006-02-23 | Mastercard International Incorporated | Collision detection and avoidance scheme for contactless card payment systems |
| WO2006019989A2 (en) * | 2004-07-15 | 2006-02-23 | Mastercard International Incorporated | Reference equipment for testing contactless payment devices |
| WO2010032594A1 (en) * | 2008-09-19 | 2010-03-25 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
| US20100124258A1 (en) * | 2008-11-20 | 2010-05-20 | Renesas Technology Corp. | Semiconductor device and communication device |
| WO2010118947A1 (en) * | 2009-04-16 | 2010-10-21 | Gemalto Sa | Communication device comprising two chips with a shared communication interface |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103577777A (en) * | 2012-07-30 | 2014-02-12 | 北京子衿晨风科技有限公司 | Equipment and method used for analyzing security of radio frequency card |
| CN103106379B (en) * | 2013-01-09 | 2016-03-09 | 北京工业大学 | A kind of non-contact IC card with robustness receives counting method |
| CN110460345A (en) * | 2019-07-29 | 2019-11-15 | 北京中电华大电子设计有限责任公司 | A kind of superelevation baud rate reception circuit parameter detection configuration method |
| CN114124163A (en) * | 2021-11-23 | 2022-03-01 | 广州智慧城市发展研究院 | Decoding method, device and equipment of electronic tag and storage medium |
| CN114124163B (en) * | 2021-11-23 | 2023-07-14 | 广州智慧城市发展研究院 | Decoding method, device, equipment and storage medium of electronic tag |
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Application publication date: 20120523 |