CN102831367A - Radio frequency identification device and radio frequency identification system - Google Patents

Radio frequency identification device and radio frequency identification system Download PDF

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Publication number
CN102831367A
CN102831367A CN2012102098170A CN201210209817A CN102831367A CN 102831367 A CN102831367 A CN 102831367A CN 2012102098170 A CN2012102098170 A CN 2012102098170A CN 201210209817 A CN201210209817 A CN 201210209817A CN 102831367 A CN102831367 A CN 102831367A
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CN
China
Prior art keywords
rfid
circuit
amplifying circuit
read head
antenna
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Pending
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CN2012102098170A
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Chinese (zh)
Inventor
唐健
邓小友
王健
王占波
黄保华
徐原森
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Shenzhen Jieshun Science and Technology Industry Co Ltd
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Shenzhen Jieshun Science and Technology Industry Co Ltd
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Priority to CN2012102098170A priority Critical patent/CN102831367A/en
Publication of CN102831367A publication Critical patent/CN102831367A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a radio frequency identification device and a radio frequency identification system, which is used for automobile management in a parking lot. The device provided by the embodiment of the invention comprises a RFID (radio frequency identification device) reading head, a first downlink amplifying circuit and a first antenna, wherein the radio frequency identification device further comprises a laser modulating circuit and an uplink amplifying circuit; a downlink interface of the RFID reading head is connected with an input end of the first downlink amplifying circuit; an output end of the first downlink amplifying circuit is connected with the laser modulating circuit; an uplink interface of the RFID reading head is connected with the output end of the uplink amplifying circuit; and an input end of the uplink amplifying circuit is connected with the first antenna. By implementing the scheme of the invention, the problem that RFID card devices in other automobiles close to an objective automobile are read by mistake in parking lot management is prevented.

Description

A kind of rfid device and system
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of rfid device and system.
Background technology
RFID (Radio Frequency Identification, RF identification) technology is used for control, detection and tracking object.Rfid system is made up of read head device and rfid card device; The read head device can be fixed or be hand-held; The rfid card device is followed examined object; The read head device is through radiofrequency signal identification RFID card device and read the related data in the rfid card device, thereby realize to detect or the purpose of location examined object, and its characteristics are need not set up machinery between read head device and the rfid card device or optics contacts.
At present, the read head device in the passive ultra-high frequency RFID system can read the data in the rfid card device several meters away, therefore is widely used in the parking lot vehicle management.The principle of work of passive ultra-high frequency RFID system is: when the vehicle that carries the rfid card device gets into the specific region of Entrance or outlet; Transtation mission circuit by the read head device sends radiofrequency signal to this rfid card device; This radiofrequency signal makes said rfid card device return a return signal to the receiving front-end of read head device for the charging of rfid card device, and the read head device reads the related data that is stored in the rfid card device through resolving this return signal.
But; Because radiofrequency signal is about 900MHz in the passive ultra-high frequency RFID system; Therefore the angle degree that is difficult to the antenna through adjustment read head device is controlled the sweep limit of passive ultra-high frequency RFID system, causes the problem of being misread near the rfid card device in other vehicle of target vehicle in the parking lot management.In addition,, cause interference between the two easily, therefore can not amplifying circuit be set, cause the poor sensitivity of read head device at the receiving front-end place owing to generally have only the isolation about 20dB between the transtation mission circuit of read head device and the receiving front-end.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of rfid device and system, is used to carry out the parking lot vehicle management, especially target vehicle is precisely located.Described rfid device of the application of the invention and system can precisely locate the rfid card device through laser modulation technique, thereby avoid the problem misread near the rfid card device in other vehicle of target vehicle in the parking lot management.Use rfid device of the present invention and system, can also improve the sensitivity of read head device.
A kind of rfid device comprises: RFID read head, the first descending amplifying circuit and first antenna,
Said rfid device also comprises:
Laser Modulation circuit and up amplifying circuit;
The downstream interface of said RFID read head connects the input end of the said first descending amplifying circuit, and the output terminal of the said first descending amplifying circuit connects said Laser Modulation circuit;
The upstream Interface of said RFID read head connects the output terminal of said up amplifying circuit, and the input end of said up amplifying circuit connects said first antenna.
A kind of rfid device comprises: the rfid card and second antenna, and said rfid device also comprises:
Transtation mission circuit, said transtation mission circuit comprise laser demodulator circuit, second descending amplifying circuit and the third antenna;
Said laser demodulator circuit connects the input end of the said second descending amplifying circuit, and the output terminal of the said second descending amplifying circuit connects said third antenna, and said second antenna connects said rfid card;
Said third antenna is used for to the said second antenna transmission radiofrequency signal.
A kind of radio-frequency recognition system comprises:
Read head device and far end device;
Said read head device is communicated by letter with the radio-frequency channel through laser channeling with said far end device and is connected;
Said read head device is used for sending laser signal to said far end device, and said far end device is used for sending radiofrequency signal to said read head device.
Can find out that from above technical scheme the embodiment of the invention has the following advantages:
The Laser Modulation circuit can convert the radiofrequency signal after amplifying through the first descending amplifying circuit laser signal into and send said laser signal to the target vehicle that carries the rfid card device; Realization is to the accurate location of target vehicle, thereby avoids the problem misread near the rfid card device in other vehicle of target vehicle in the parking lot management.In addition, up amplifying circuit can amplify the radiofrequency signal that first antenna receives, and, can avoid interference the sensitivity that has therefore improved the read head device through in down going channel and data feedback channel, using the various signals form.
Description of drawings
Fig. 1 is the rfid device structural drawing of first embodiment of the invention;
Fig. 2 is the rfid device structural drawing of second embodiment of the invention;
Fig. 3 is the radio-frequency recognition system structural drawing of third embodiment of the invention.
Embodiment
To combine the Figure of description among the present invention below, the technical scheme in the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of rfid device and system, is used to carry out the parking lot vehicle management, especially target vehicle is precisely located.So that avoid the problem misread near the rfid card device in other vehicle of target vehicle in the parking lot management, the sensitivity that can also improve the read head device simultaneously.
First embodiment of the invention will be elaborated to a kind of rfid device, and the described rfid device of present embodiment can be the read head device in the passive ultra-high frequency RFID system, and its concrete structure sees also Fig. 1, comprising:
The descending amplifying circuit of RFID read head 10, first 11, Laser Modulation circuit 12, up amplifying circuit 13 and first antenna 14, said rfid device also further comprises parking lot system 15.
Wherein, the downstream interface of RFID read head 10 connects the input end of the first descending amplifying circuit 11, and the output terminal of the first descending amplifying circuit 11 connects Laser Modulation circuit 12.The upstream Interface of RFID read head 10 connects the output terminal of up amplifying circuit 13, and the input end of up amplifying circuit 13 connects first antenna 14.Parking lot system 15 is connected with 10 communications of RFID read head.
RFID read head 10 is used for sending baseband signal to the first descending amplifying circuit 11.RFID read head 10 also is used to receive the radiofrequency signal after amplifying through up amplifying circuit 13, and the mode of the local oscillation signal that utilizes self through mixing is reduced to baseband signal with it.
The first descending amplifying circuit 11 is used for the baseband signal that RFID read head 10 sends is enlarged into the radiofrequency signal that meets the 12 reception requirements of Laser Modulation circuit.
Laser Modulation circuit 12 is used for the radiofrequency signal after amplifying through the first descending amplifying circuit 11 is converted into laser signal and sends said laser signal, the take over party of said laser signal is not done concrete qualification here.In the passive ultra-high frequency RFID system of prior art; Do not set up laser channeling and be used for transmission signals; Use the meaning of Laser Modulation circuit 12 to be to convert the part in the down going channel into laser channeling by the radio-frequency channel in the present embodiment device, thus the phase mutual interference when avoiding the uplink and downlink passage to be the radio-frequency channel.
Up amplifying circuit 13 is used to amplify the radiofrequency signal that first antenna 14 receives, and sends said radiofrequency signal to RFID read head 10.In the passive ultra-high frequency RFID system of prior art; Because the uplink and downlink passage is the radio-frequency channel; Phase mutual interference in this device for carrying out said owing to having used Laser Modulation circuit 12 to avoid the uplink and downlink passage to be the radio-frequency channel; Therefore up amplifying circuit 13 can be set in up receiving circuit, thereby improve the sensitivity of read head device.
First antenna 14 is used to receive the radiofrequency signal that the rfid card device is sent.
The data that parking lot system 15 is used for reading according to RFID read head 10 are carried out vehicle management, and said data are that RFID read head 10 generates according to the radiofrequency signal that receives.In addition, parking lot system 15 is whole rfid device power supply.
In this enforcement; Laser Modulation circuit 12 can convert the radiofrequency signal after amplifying through the first descending amplifying circuit 11 laser signal into and send said laser signal to the target vehicle that carries the rfid card device; Realization is to the accurate location of target vehicle, thereby avoids the problem misread near the rfid card device in other vehicle of target vehicle in the parking lot management.In addition, up amplifying circuit 13 can amplify the radiofrequency signal that first antenna 14 receives, and, can avoid interference the sensitivity that has therefore improved the read head device through in down going channel and data feedback channel, using the various signals form.
Second embodiment of the invention will be elaborated to another kind of rfid device; The described rfid device of present embodiment can be the far end device in the passive ultra-high frequency RFID system; Said far end device comprises rfid card device of the prior art; Said rfid device all is positioned on the vehicle, and its concrete structure sees also Fig. 2, comprising:
Transtation mission circuit 20, rfid card 21 and second antenna 22, said rfid device also further comprises trigger 23, controller 24 and power supply 25.
Wherein, transtation mission circuit 20 can communicate through the radio-frequency channel with rfid card 21 and be connected.Rfid card 21 connects second antenna 22.Trigger 23 is connected with controller 24 communications, and controller 24 is connected with transtation mission circuit 20 communications, and power supply 25 is connected with transtation mission circuit 20.
Transtation mission circuit 20 is used to receive laser signal, is reduced to radiofrequency signal to said laser signal, and sends said radiofrequency signal to second antenna 22.Wherein, transtation mission circuit 20 further comprises laser demodulator circuit 201, second descending amplifying circuit 202 and the third antenna 203.Laser demodulator circuit 201 connects the input end of the second descending amplifying circuit 202, and the output terminal of the second descending amplifying circuit 202 connects third antenna 203.Laser demodulator circuit 201 is used for the laser signal that receives is converted into radiofrequency signal and sends said radiofrequency signal to the second descending amplifying circuit 202.The radiofrequency signal that the second descending amplifying circuit 202 is used to receive and amplifying laser demodulator circuit 201 is sent.Third antenna 203 is used for sending the radiofrequency signal after the second descending amplifying circuit 202 amplifies to second antenna 22.Transtation mission circuit 20 is actually the part of down going channel in the passive ultra-high frequency RFID system.
Rfid card 21 is used to store relevant vehicle management information, and through the radiofrequency signal of second antenna 22 to 20 transmissions of read head device reflection transtation mission circuit, the radiofrequency signal of said reflection comprises said vehicle management information.
Second antenna 22 is used to receive the radiofrequency signal that third antenna 203 sends, and also is used for to the said radiofrequency signal of device reflection.
Trigger 23 is used for when satisfying trigger condition, triggers said controller 24 work.Preferably, trigger 23 can be electromagnetic inductor.Therefore, in parking lot management, a concrete trigger condition is that vehicle is pressed the ground sense.When being the sense of vehicle pressure ground, signal is felt on electromagnetic inductor induction ground, and triggers controller 24 work.
Controller 24 is used to control the duty of transtation mission circuit 20, and said duty comprises opening and closed condition.Preferably, controller 24 can be single-chip microcomputer or PLD.Therefore; In parking lot management; Single-chip microcomputer or PLD are only just controlled transtation mission circuit 20 and are got into openings when meeting trigger condition, under situation in fact, all control transtation mission circuit 20 and be in closed condition, can save the electric weight of power supply 25 like this.
Power supply 25 is used to said transtation mission circuit power supply.Preferably, power supply 25 can be battery.When controller 24 control transtation mission circuits 20 got into opening, just for the passive ultra-high frequency RFID system has set up down going channel, when controller 24 control transtation mission circuits 20 were in closed condition, the down going channel of passive ultra-high frequency RFID system had also just broken off.This design can be saved the electric weight of present embodiment device, prolongs its serviceable life.
In the present embodiment; Transtation mission circuit 20 is the part of down going channel; Used laser signal, realized, thereby avoided the problem misread near the rfid card device in other vehicle of target vehicle in the parking lot management the accurate location of read head device to target vehicle.Through in down going channel and data feedback channel, using the various signals form, can avoid interference the sensitivity that has therefore improved the read head device.
Third embodiment of the invention will be elaborated to a kind of radio-frequency recognition system, and the described radio-frequency recognition system concrete structure of present embodiment sees also Fig. 3, comprising:
Read head device 31 and far end device 32.
Wherein, read head device 31 is communicated by letter with the radio-frequency channel through laser channeling with far end device 32 and is connected.
Read head device 31 is used for sending laser signal to far end device 32.Wherein, Read head device 31 can comprise for like the described rfid device of first embodiment of the invention: the descending amplifying circuit of RFID read head 310, first 311, Laser Modulation circuit 312, up amplifying circuit 313, first antenna 314 and parking lot system 315.The inner structure of read head device 31 and each parts concrete function see also the relevant record of first embodiment of the invention and Fig. 1, repeat no more here.
Far end device 32 is used for sending radiofrequency signal to read head device 31.Wherein, Far end device 32 can be for like the described rfid device of second embodiment of the invention; Comprise: transtation mission circuit 320, rfid card 321, second antenna 322, trigger 323, controller 324 and power supply 325, transtation mission circuit 320 also further comprises laser demodulator circuit 3201, second descending amplifying circuit 3202 and the third antenna 3203.The inner structure of far end device 32 and each parts concrete function see also the relevant record of second embodiment of the invention and Fig. 2, repeat no more here.
A concrete application scenarios is following:
Read head device 31 is positioned over the Entrance place, and far end device 32 is positioned on the vehicle.
When vehicle arrived the Entrance place, vehicle was pressed the ground sense, and triggering controller 324 control transtation mission circuits 320 got into opening after trigger 323 was felt signal with sensing, and power supply 325 is the transtation mission circuit power supply, and at this moment, the down going channel of native system is set up completion.
RFID read head 310 sends signal to the first descending amplifying circuit 311; The first descending amplifying circuit 311 is enlarged into the radiofrequency signal that Laser Modulation circuit 312 can normally receive with this signal; And sending these radiofrequency signals to Laser Modulation circuit 312, Laser Modulation circuit 312 receives and it is modulated to laser signal after these radiofrequency signals and sends to far end device 32.
Laser demodulator circuit 3201 receives this laser signal; And with its demodulation; Be reduced to radiofrequency signal; Be sent to second descending amplifying circuit 3202, the second descending amplifying circuits 3202 this radiofrequency signal is amplified, the radiofrequency signal after transtation mission circuit 320 will amplify through third antenna 3203 then is sent to second antenna 322.
321 reflections are sent to first antenna 314 through second antenna 322 to radiofrequency signal through rfid card; After amplifying, the radiofrequency signal that up amplifying circuit 313 receives first antenna 314 sends it back RFID read head 310; RFID read head 310 receives through the radiofrequency signal after up amplifying circuit 313 amplifications; And according to its generation data, said data comprise the vehicle management information of this vehicle, and parking lot system 315 carries out corresponding vehicle management according to said data.
Wherein, the radiofrequency signal that the third antenna 3203 in the far end device 32 sends may activate the rfid card on other vehicle, and these rfid cards also can report this card information to read head device 31.In order to make 31 work of read head device more accurate; Introduce the secondary affirmation mechanism; Be specially after read head device 31 receives this card information that rfid card reports, send confirmation to this card again, if this cartoon is crossed affirmation; Represent that then this card is the target rfid card of this vehicle management, otherwise do not give through.
Principle in the above-mentioned application scenario is equally applicable to similar sights such as EXIT place, can not enumerate one by one here, so repeat no more.
In the described radio-frequency recognition system of the embodiment of the invention, in down going channel, used laser signal, realize accurate location, thereby avoid the problem misread near the rfid card device in other vehicle of target vehicle in the parking lot management target vehicle.In addition, in down going channel and data feedback channel, use the various signals form, can avoid interference the sensitivity that has therefore improved the read head device.
More than a kind of rfid device provided by the present invention and system have been carried out detailed introduction; For one of ordinary skill in the art; Thought according to the embodiment of the invention; The part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (9)

1. rfid device, comprising: RFID read head, the first descending amplifying circuit and first antenna is characterized in that said rfid device also comprises:
Laser Modulation circuit and up amplifying circuit;
The downstream interface of said RFID read head connects the input end of the said first descending amplifying circuit, and the output terminal of the said first descending amplifying circuit connects said Laser Modulation circuit;
The upstream Interface of said RFID read head connects the output terminal of said up amplifying circuit, and the input end of said up amplifying circuit connects said first antenna.
2. rfid device according to claim 1 is characterized in that,
Said Laser Modulation circuit is used for the radiofrequency signal after amplifying through the said first descending amplifying circuit is converted into laser signal and sends said laser signal, and said up amplifying circuit is used to amplify the radiofrequency signal that said first antenna receives.
3. rfid device according to claim 1 and 2 is characterized in that, said rfid device further comprises:
The parking lot system, said parking lot system is used for carrying out vehicle management according to the data that said RFID read head reads;
Said parking lot system communicates by letter with said RFID read head and is connected.
4. rfid device, comprising: the rfid card and second antenna is characterized in that said rfid device also comprises:
Transtation mission circuit, said transtation mission circuit comprise laser demodulator circuit, second descending amplifying circuit and the third antenna;
Said laser demodulator circuit connects the input end of the said second descending amplifying circuit, and the output terminal of the said second descending amplifying circuit connects said third antenna, and said second antenna connects said rfid card;
Said third antenna is used for to the said second antenna transmission radiofrequency signal.
5. rfid device according to claim 4 is characterized in that,
Said laser demodulator circuit is used for the laser signal that receives is converted into radiofrequency signal and sends said radiofrequency signal to the said second descending amplifying circuit, and said second amplifying circuit is used to receive and amplify the radiofrequency signal that said laser demodulator circuit is sent.
6. according to claim 4 or 5 described rfid devices, it is characterized in that said rfid device further comprises:
Trigger, controller and power supply;
Said trigger is communicated by letter with said controller and is connected, and is used for when satisfying trigger condition, triggers said controller work;
Said controller is communicated by letter with said transtation mission circuit and is connected, and is used to control the duty of said transtation mission circuit, and said duty comprises opening and closed condition;
Said power supply is connected with said transtation mission circuit, is used to said transtation mission circuit power supply.
7. rfid device according to claim 6 is characterized in that,
Said trigger is an electromagnetic inductor, but said controller is single-chip microcomputer or editorial logic device, and said power supply is a battery.
8. a radio-frequency recognition system is characterized in that, comprising:
Read head device and far end device;
Said read head device is communicated by letter with the radio-frequency channel through laser channeling with said far end device and is connected;
Said read head device is used for sending laser signal to said far end device, and said far end device is used for sending radiofrequency signal to said read head device.
9. radio-frequency recognition system according to claim 8 is characterized in that,
Said read head device is like each described rfid device of claim 1 to 3;
Said far end device is like each described rfid device of claim 4 to 7.
CN2012102098170A 2012-06-25 2012-06-25 Radio frequency identification device and radio frequency identification system Pending CN102831367A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107341525A (en) * 2016-04-28 2017-11-10 欧姆龙株式会社 Interactive communication device, the system and program for possessing interactive communication device
WO2019104477A1 (en) * 2017-11-28 2019-06-06 合肥美的智能科技有限公司 Refrigerator, and food positioning apparatus for refrigerator

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CN201515468U (en) * 2009-09-09 2010-06-23 成都华塑电子技术开发有限公司 Laser receiving and transmitting integral machine
CN201584005U (en) * 2009-12-31 2010-09-15 青岛海尔软件有限公司 Vehicle management system based on radio frequency identification technology
CN202795388U (en) * 2012-06-25 2013-03-13 深圳市捷顺科技实业股份有限公司 Radio frequency identification device and radio frequency identification system

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Publication number Priority date Publication date Assignee Title
US7640185B1 (en) * 1995-12-29 2009-12-29 Dresser, Inc. Dispensing system and method with radio frequency customer identification
CN1545225A (en) * 2003-11-11 2004-11-10 武汉虹信通信技术有限责任公司 Free space optical transmission mobile communication direct amplifying station
CN201515468U (en) * 2009-09-09 2010-06-23 成都华塑电子技术开发有限公司 Laser receiving and transmitting integral machine
CN201584005U (en) * 2009-12-31 2010-09-15 青岛海尔软件有限公司 Vehicle management system based on radio frequency identification technology
CN202795388U (en) * 2012-06-25 2013-03-13 深圳市捷顺科技实业股份有限公司 Radio frequency identification device and radio frequency identification system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107341525A (en) * 2016-04-28 2017-11-10 欧姆龙株式会社 Interactive communication device, the system and program for possessing interactive communication device
CN107341525B (en) * 2016-04-28 2020-08-18 欧姆龙株式会社 Interactive communication device, system provided with same, and program
WO2019104477A1 (en) * 2017-11-28 2019-06-06 合肥美的智能科技有限公司 Refrigerator, and food positioning apparatus for refrigerator

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Application publication date: 20121219