CN202976072U - Radio frequency identification bus system - Google Patents
Radio frequency identification bus system Download PDFInfo
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- CN202976072U CN202976072U CN 201220360870 CN201220360870U CN202976072U CN 202976072 U CN202976072 U CN 202976072U CN 201220360870 CN201220360870 CN 201220360870 CN 201220360870 U CN201220360870 U CN 201220360870U CN 202976072 U CN202976072 U CN 202976072U
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Abstract
The utility model discloses a radio frequency identification bus system. A plurality of main controllers, relay amplifiers and sub-controllers are arranged between an original RFID (radio frequency identification) reader and a sensing antenna so as to form the radio frequency identification bus system; and the appointed sensing antenna is polled and gated in a time division multiplexing way by a control signal, so that a radio frequency read-write signal is guaranteed to be communicated with one sensing antenna only for operation in the same time period, and at the moment, the radio frequency read-write operation is finished by the sensing antenna. According to the radio frequency identification bus system, numerous sensing antennae form an array on the basis of the conventional radio frequency identification system, so that the radio frequency identification range is expanded, the utilization rate of the reader is increased, and the problems of reader collision and long-distance radio frequency signal attenuation of the sensing antennae are solved.
Description
Technical field
The present invention relates to a kind of bus control system, especially radio-frequency (RF) identification bus (RFID Bus) system.
Background technology
Radio-frequency recognition system is made of electronic tag, read write line and host computer three parts usually.Read write line and the antenna of some kinds are integrated, and a read write line drives an antenna.The coverage of an antenna is limited, and, environment more at barrier be than under complicated situation, and its operating distance will further shorten, and be unfavorable for reading fast a large amount of electronic tags.Realize the electronic tag that is distributed in a large number in scope of business zone is read fast, forefathers have done a lot of relevant research work and have obtained achievement.
Yet these schemes still have weak point, and for example radio-frequency (RF) switch can realize switching, but its quantity still can only very limited expansion; Radio frequency identification signal does not have special bus, needs different protocol converters to change could to realize and the docking of system of subject; The reach of single read write line is limited, can not realize the covering of large-scale application occasion; If need to realize extensive the covering, need a plurality of read write lines, cost will be very high.
Therefore, a kind of radio-frequency (RF) identification bus system need to be designed, above-mentioned one or more problems that prior art exists can be overcome.
Summary of the invention
The object of the invention is to provide a kind of expansion and control system of radio frequency identification signal, the read-write scope of a rfid interrogator is expanded to any a plurality of RFID electronic tags region within the jurisdiction in theory, improve usable range and the efficient of rfid interrogator, form read-write system and add service logic, realizing concrete service application.
To achieve these goals, the invention provides a kind of radio-frequency (RF) identification bus system, comprising:
At least one induction antenna array, each induction antenna send radiofrequency signal near RFID label and receive the reflection carrier signal of sending from the RFID label;
At least one sub-controller chain, each sub-controller is connected to one of induction antenna array, sends emitting radio frequency signal to the induction antenna in this induction antenna array, and receives the reflection carrier signal from induction antenna;
At least one relay amplifier chain, each relay amplifier is connected to one of sub-controller chain, receives to send out/receive control signal and emitting radio frequency signal, sends the emitting radio frequency signal of amplification to this sub-controller chain, and receives the reflection carrier signal and amplify from it;
At least one master controller, each master controller is connected to one of relay amplifier chain, sends/receive control signal and emitting radio frequency signal to this relay amplifier chain, and receives the reflection carrier signal of amplifying from it;
Rfid interrogator is connected at least one master controller, to its transmission based on the emitting radio frequency signal of read write command and send out/receive control signal, and receives the reflection carrier signal of amplifying from it;
Upper control computer, respectively with rfid interrogator be connected master controller and be connected, send read write command to rfid interrogator, obtain RFID read-write and recognition result from rfid interrogator, and send the poll instruction to master controller,
Wherein, rfid interrogator, master controller, relay amplifier chain, sub-controller chain and induction antenna array are connected the radio frequency connection cable and are connected successively, and signal is via radio frequency connection cable sending and receiving,
Wherein, each master controller will generate switch-over control signal according to the poll instruction and be sent to corresponding relay amplifier chain and sub-controller chain via the radio frequency connection cable,
Wherein, according to switch-over control signal, a relay amplifier in the relay amplifier chain that each master controller gating is attached thereto, a sub-controller in the sub-controller chain that this relay amplifier gating is attached thereto, and an induction antenna in the induction antenna array that this sub-controller gating is attached thereto, thereby execution is to the poll of induction antenna.
Described radio-frequency (RF) identification bus system, wherein each master controller comprises generating the radio frequency switching generation module of switch-over control signal.
Described radio-frequency (RF) identification bus system, wherein each relay amplifier comprises the power amplifier device PA of amplifying emission radiofrequency signal and amplifies the low-noise amplifier LNA of reflection carrier signal.
Described radio-frequency (RF) identification bus system, wherein each relay amplifier chain is the daisy chain cascading of a plurality of relay amplifiers, and each sub-controller chain of territory person is the daisy chain cascading of a plurality of sub-controllers.
Synchronous control signal is sent out/received to described radio-frequency (RF) identification bus system wherein, also via the transmission of radio frequency connection cable between rfid interrogator and master controller.
Described radio-frequency (RF) identification bus system, wherein, the radio frequency connection cable is the cable that relay amplifier and sub-controller are carried out direct current supply.
In the syndeton of above invention, remove relay amplifier, change by the direct connexon controller of master controller, can consist of the another kind of connected mode of system of the present invention, except the feature that relaying amplifies, other system feature preserving.
Describe also by reference to the accompanying drawings by following concrete enforcement, the present invention will be set forth more clearly, be below description of drawings, be used for explaining embodiments of the invention.
Description of drawings
Fig. 1 is the topology diagram of described radio-frequency (RF) identification bus system;
Fig. 2 is the simplification topology diagram that described radio-frequency (RF) identification bus system is removed relay amplifier;
Fig. 3 is the signal transmission schematic diagram of described radio-frequency (RF) identification bus system;
Fig. 4 is the poll read-write process flow diagram flow chart of described radio-frequency (RF) identification bus system.
Embodiment
For technological means, innovative point that the present invention is realized, reach purpose and effect and be easier to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
Read write line is connected with induction antenna and is connected in wired mode, so the deployment scope of reading and writing device antenna can be expanded with the growth of connection cable, also make a plurality of antennas of read write line band and carry out radio frequency by machinery or electronics mode simultaneously to be switching to possibility.According to the embodiment of the present invention, can guarantee in the same time period by the mode of time-division multiplex, antenna array is shown and is only had an antenna to be connected work with read write line, avoids the read write line collision.In addition, can by between read write line and antenna, increase power amplifier device and solve long-range radio-frequency power attenuation problem.Therefore, comprise polling switching device and radio frequency amplification apparatus according to the radio-frequency (RF) identification bus system of the embodiment of the present invention, the former makes a plurality of dwi hastasanas become aerial array, greatly increases the number that each read write line can connect antenna; The latter makes up with connection cable and increases the radio frequency signal attenuation that causes, the deployment scope of extended antenna.
Fig. 1 is the overall topological diagram of system embodiment one of the present invention, as we can see from the figure the framework step by step of radio-frequency (RF) identification bus system:
(1) Far Left is single channel rfid interrogator 1, can read and write radiofrequency signal;
(2) rfid interrogator 1 right side next-door neighbour be a master controller 2, front end connects one road read-write interface of rfid interrogator 1, the rear end can be divided into five road gatings outputs;
(3) master controller 2 right sides next-door neighbours be relay amplifier 3, reserve 8 codings if system is relay amplifier 3 addressing, 255 relay amplifiers of every No. 1 master controller 2 outgoing side addressable 3 carry out daisy chain cascading in theory;
What (4) be close to above relay amplifier 3 is sub-controller 4, reserves 8 codings if system is sub-controller 4 addressing, in theory 255 sub-controllers 4 of outgoing side addressable of each relay amplifier 3;
What (5) connect at sub-controller 4 rear end outgoing sides is induction antenna 5, and each sub-controller 4 can connect ten road feels and answer antenna 5, and induction antenna 5 is ends of whole bus system.
Fig. 2 is the topology diagram of embodiments of the invention two, and owing to having reduced the relay amplifier 3 in Fig. 1, in system, radiofrequency signal can not obtain the relaying amplification, and other functions keep.The framework step by step of the radio-frequency (RF) identification bus system of this simplification as we can see from the figure:
(1) Far Left is single channel rfid interrogator 1, can read and write radiofrequency signal;
(2) rfid interrogator 1 right side next-door neighbour be a master controller 2, front end connects one road read-write interface of rfid interrogator 1, the rear end can be divided into five road gatings outputs;
(3) master controller 2 right sides next-door neighbours be sub-controller 4, reserve 8 codings if system is sub-controller 4 addressing, in theory 255 sub-controllers 4 of every No. 1 master controller 2 outgoing side addressable;
What (4) connect at sub-controller 4 rear end outgoing sides is induction antenna 5, and each sub-controller 4 can connect ten road feels and answer antenna 5, and induction antenna 5 is ends of whole bus system.
The signal transmission schematic diagram of the radio-frequency (RF) identification bus system of Fig. 3 has been described the annexation of radio-frequency (RF) identification bus system internal module, wherein:
(1) rfid interrogator 1 comprises power module and reader/writer module, is responsible for receiving the read write command of upper control computer, and exports to master controller 2 by the radio frequency mouth, and gating induction antenna 5 is realized read-write operation;
(2) master controller 2 comprises that power module, radio frequency switch generation module, master switching switch, wherein radio frequency switches the switching command that module reception upper control computer occurs, being converted into can be at the electronics switching command of master controller 2, relay amplifier 3 and sub-controller 4 execution, drive step by step the change-over switches at different levels induction antenna 5 of gating appointment successively, realize the poll read-write operation;
(3) relay amplifier 3 comprises Tx/Rx signal identification module, PA amplification module and LNA amplification module, wherein the demodulation of Tx/Rx signal identification module is from current sending out in the radio frequency connecting line/receipts control signal, if current when transmitting for Tx, gating PA amplification module amplifies radio frequency transmissions, if current when receiving signal for Rx, gating LNA amplification module amplifies the reflection carrier signal;
(4) sub-controller 4 comprises son control change-over switch, demodulation is from the switch-over control signal of RF cable, the induction antenna 5 of gating appointment reserves 8 codings if system is sub-controller 4 addressing, in theory 255 sub-controllers 4 of outgoing side addressable of each relay amplifier 3; The power supply of sub-controller 4 provides direct current supply by RF cable;
(5) in RF cable, radiofrequency signal comprises the radio frequency transmissions of forward and reverse reflection carrier signal;
(6) in RF cable, send out and to do control signal, switch-over control signal and direct current supply and be to the transmission of output terminal forward.
Below in conjunction with the system shown in Figure 1 structure, with reference to Fig. 4, the example of radio frequency identification bus working-flow is described in detail.Here, suppose single channel rfid interrogator 1, the master controller 2 of five road gating outputs, system is that relay amplifier 3 addressing reserve 8 codings, thereby 255 relay amplifiers 3 carry out daisy chain cascading, and system is that sub-controller 4 addressing reserve 8 codings, thereby 255 sub-controllers 4 carry out daisy chain cascading.In addition, each sub-controller 4 can connect ten road feels and answers antenna 5.These concrete numbers are only examples, and those skilled in the art can select other numbers according to service needed.
S01. upper control computer sends to rfid interrogator 1 by read write command, to comprise the switching controls instruction of selecting to specify induction antenna 5 to participate in poll read-write and poll parameter and send to master controller 2, for example, upper control computer is assigned polling order to first master controller 2: the 4th to the 8th antenna of second sub-controller 4 of first relay amplifier 3 of its first output of poll, and the 1st to the 5th antenna of the 3rd sub-controller 4 of second relay amplifier 3, have 10 antennas of poll altogether
The form of switching controls instruction: " 00-x00-x00-00 ", be specially 8 poll instructions, be respectively:
01-x01-x02-04，01-x01-x02-05，01-x01-x02-06，01-x01-x02-07，01-x01-x02-08，
01-x02-x03-01，01-x02-x03-02，01-x02-x03-03，01-x02-x03-04，01-x02-x03-05，
Wherein in every poll instruction:
The first two tens digit represents the first output terminal of gating master controller 2, and master controller 2 has five output terminals, from " 01 " to " 05 ",
Represent the address of relay amplifier 3 with first group of sexadecimal number of x beginning, take top instruction as example, 255 relay amplifiers 3 of every group of addressable, namely can arrange 255 relay amplifiers 3 in this level simultaneously, each relay amplifier 3 all distributes mutually different 8 bit address codes, from " x01 " to " xFF "
Represent the address of sub-controller 4 with second group of sexadecimal number of x beginning, take top instruction as example, 255 sub-controllers 4 of every group of addressable, namely can arrange 255 sub-controllers 4 in this level simultaneously, each sub-controller 4 all distributes mutually different 8 bit address codes, from " x01 " to " xFF "
Last two tens digits represent the address of induction antenna 5, and 10 induction antennas 5 of every group of addressable are from " 01 " to " 10 ";
The poll Parametric Representation is " x01-200 ", represents poll one time, and be 200ms the interval time of each antenna read-write operation;
S02.RFID read write line 1 is converted into the read write command of upper control computer radiofrequency signal and sends out/receive control signal, is transferred to master controller 2, initiates the read-write operation of radio-frequency (RF) identification;
S03. master controller 2 receives the switching controls instruction of upper control computer, switch by radio frequency module occurs, being converted into specifically can be at the switch-over control signal of master controller 2, relay amplifier 3 and sub-controller 4 execution, together with sending out/receive control signal, by the master control 2 correct output channels of change-over switch gating, be transferred to together the relay amplifier 3 of appointment
According to example, at first carry out article one instruction: " 01-x01-x02-04 ", master controller 2 switches first output channel " 01 ", and resolves first relay amplifier 3 of " x01 " gating;
S04. control signal is readjusted the distribution/received to relay amplifier 3 solutions, if currently amplify radio frequency transmissions by PA for Tx transmits, then continues the demodulation switch-over control signal, drives change-over switch gating sub-controller 4, sends switch-over control signals to sub-controller 4,
According to example, resolve second sub-controller 4 of " x02 " gating;
S05. sub-controller 4 demodulation switch-over control signals, drive change-over switch gating induction antenna 5,
According to example, resolve " 04 " and navigate on the 4th induction antenna 5 of second sub-controller 4 of gating;
S06.RFID read write line 1 arrives and specifies induction antenna 5 via master controller 2, relay amplifier 3PA, sub-controller 4 in next time period transmitting radiofrequency signal, comes the active electron label by induction antenna 5 wireless transmit radiofrequency signals; The induction antenna 5 reflection carrier signal returned of wireless receiving electronic tag again returns;
S07. sub-controller 4 receives the reflection carrier signal that induction antenna 5 is passed back, to rfid interrogator 1 direction passback;
S08. relay amplifier 3 reception induction antennas 5 are passed back, via the reflection carrier signal of sub-controller 4, to rfid interrogator 1 direction passback;
S09. describe as S04, control signal is readjusted the distribution/received to the continuous solution of relay amplifier 3, if when current sending out/receipts control signal was Rx reception signal, relay amplifier 3 amplified the reflection carrier signal by LNA, passes the reflection carrier signal back to master controller 2;
S10. master controller 2 reception induction antennas 5 are passed back, via the reflection carrier signal of sub-controller 4 and relay amplifier 3 amplifications;
S11. last, rfid interrogator 1 receives the reflection carrier signal that induction antenna 5 is passed back, realizes this time to specifying the read-write operation of the electronic tag under induction antenna 5 coverings;
S12. judge whether current polling tasks is completed, if do not complete, switches to next instruction, continue the next induction antenna 5 of gating and carry out the poll read-write operation, until all polling tasks end of this round,
According to example, next first master controller 2 carries out next poll instruction " 01-x01-x02-05 " again within next time period, so move in circles, until execute the last item poll instruction " 01-x02-x03-05 ", and completed corresponding RFID read-write operation, this group polling instruction is complete, and the radio-frequency (RF) identification bus system is ready again.
The beneficial effect of radio-frequency (RF) identification bus system of the present invention is:
(1) reach with a rfid interrogator expands the coverage of any a plurality of radio frequency induction antennas in theory to, greatly reduces the use cost of rfid system;
(2) in the situation that usable range enlarges, utilize relaying to amplify and avoid radio frequency signal attenuation, guarantee enough system's radio-frequency (RF) signal strength, pass through the enough activation energies of system acquisition to guarantee electronic tag;
(3) system needs Power supply except rfid interrogator and master controller, and other equipment facilitate System Implementation by the radio frequency line power taking;
(4) system in implementation process is installed, can in the situation that RFID does not read and write ALCL Assembly Line Communication Link connection voluntarily, avoid setup error.
Above radio-frequency (RF) identification bus system of the present invention is described in detail, and the embodiment of example is set forth.To the technician of the industry, according to method of the present invention and core concept, all will change in concrete enforcement and range of application, instructions of the present invention should not be construed as limitation of the present invention.The claimed scope of the present invention is defined by appended claims and equivalent thereof.
Claims (7)
1. radio-frequency (RF) identification bus system comprises:
At least one induction antenna array, each induction antenna send radiofrequency signal near RFID label and receive the reflection carrier signal of sending from the RFID label;
At least one sub-controller chain, each sub-controller is connected to one of induction antenna array, sends emitting radio frequency signal to the induction antenna in this induction antenna array, and receives the reflection carrier signal from induction antenna;
At least one relay amplifier chain, each relay amplifier is connected to one of sub-controller chain, receives to send out/receive control signal and emitting radio frequency signal, sends the emitting radio frequency signal of amplification to this sub-controller chain, and receives the reflection carrier signal and amplify from it;
At least one master controller, each master controller is connected to one of relay amplifier chain, sends/receive control signal and emitting radio frequency signal to this relay amplifier chain, and receives the reflection carrier signal of amplifying from it;
Rfid interrogator is connected at least one master controller, sends based on the emitting radio frequency signal of read write command and sends out/receive control signal to it, and receiving the reflection carrier signal of amplifying from it;
Upper control computer, respectively with rfid interrogator be connected master controller and be connected, send read write command to rfid interrogator, receive RFID read-write and recognition result from rfid interrogator, and send the poll instruction to master controller,
Wherein, rfid interrogator, master controller, relay amplifier chain, sub-controller chain and induction antenna array are connected the radio frequency connection cable and are connected successively, and signal is via radio frequency connection cable sending and receiving,
Wherein, each master controller will generate switch-over control signal according to the poll instruction and be sent to corresponding relay amplifier chain and sub-controller chain via the radio frequency connection cable,
Wherein, according to switch-over control signal, a relay amplifier in the relay amplifier chain that each master controller gating is attached thereto, a sub-controller in the sub-controller chain that this relay amplifier gating is attached thereto, and an induction antenna in the induction antenna array that this sub-controller gating is attached thereto, thereby execution is to the poll of induction antenna.
2. radio-frequency (RF) identification bus system as claimed in claim 1, wherein each master controller radio frequency of comprising generating switch-over control signal switches module occurs.
3. radio-frequency (RF) identification bus system as claimed in claim 1, wherein each relay amplifier comprises the power amplifier device PA of amplifying emission radiofrequency signal and amplifies the low-noise amplifier LNA of reflection carrier signal.
4. radio-frequency (RF) identification bus system as claimed in claim 1, wherein each relay amplifier chain is the daisy chain cascading of a plurality of relay amplifiers, and/or each sub-controller chain is the daisy chain cascading of a plurality of sub-controllers.
5. radio-frequency (RF) identification bus system as claimed in claim 1, wherein, also send out/receive synchronous control signal via the transmission of radio frequency connection cable between rfid interrogator and master controller.
6. radio-frequency (RF) identification bus system as claimed in claim 1, wherein, the radio frequency connection cable is the cable that relay amplifier and sub-controller are carried out direct current supply.
7. radio-frequency (RF) identification bus system comprises:
At least one induction antenna array, each induction antenna send radiofrequency signal near RFID label and receive the reflection carrier signal of sending from the RFID label;
At least one sub-controller chain, each sub-controller is connected to one of induction antenna array, sends emitting radio frequency signal to the induction antenna in this induction antenna array, and receives the reflection carrier signal from induction antenna;
At least one master controller, each master controller is connected to one of sub-controller chain, sends/receive control signal and emitting radio frequency signal to this sub-controller chain, and receives the reflection carrier signal of amplifying from it;
Rfid interrogator is connected at least one master controller, sends based on the emitting radio frequency signal of read write command and sends out/receive control signal to it, and receiving the reflection carrier signal of amplifying from it;
Upper control computer, respectively with rfid interrogator be connected master controller and be connected, send read write command to rfid interrogator, receive RFID read-write and recognition result from rfid interrogator, and send the poll instruction to master controller,
Wherein, rfid interrogator, master controller, sub-controller chain and induction antenna array are connected the radio frequency connection cable and are connected successively, and signal is via radio frequency connection cable sending and receiving,
Wherein, each master controller will generate switch-over control signal according to the poll instruction and be sent to corresponding relay amplifier chain and sub-controller chain via the radio frequency connection cable,
Wherein, according to switch-over control signal, a sub-controller in the sub-controller chain that each master controller gating is attached thereto, and an induction antenna in the induction antenna array that is attached thereto of this sub-controller gating, thus carry out poll to induction antenna.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220360870 CN202976072U (en) | 2012-07-25 | 2012-07-25 | Radio frequency identification bus system |
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| CN 201220360870 CN202976072U (en) | 2012-07-25 | 2012-07-25 | Radio frequency identification bus system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114040478A (en) * | 2021-10-29 | 2022-02-11 | 清华大学 | Low-power-consumption intelligent super-surface hardware structure, precoding method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114040478A (en) * | 2021-10-29 | 2022-02-11 | 清华大学 | Low-power-consumption intelligent super-surface hardware structure, precoding method and device |
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Address after: 100176 Beijing city in Western Daxing District Yizhuang economic and Technological Development Zone, Road No. 26 Building No. 30 hospital Jiajie enterprise meeting A 502-4 Patentee after: TECHBLOOM (BEIJING) INFORMATION TECHNOLOGY CO.,LTD. Address before: 100176 Beijing branch of Yizhuang economic and Technological Development Zone No. 99 fourteen street huilongsen Science Park Building No. 7 2501 Patentee before: TECHBLOOM (BEIJING) INFORMATION TECHNOLOGY CO.,LTD. |
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