CN102004932A - Multi-read-write unit synchronous system of RFID (Radio Frequency Identification Device) - Google Patents
Multi-read-write unit synchronous system of RFID (Radio Frequency Identification Device) Download PDFInfo
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- CN102004932A CN102004932A CN 201010546238 CN201010546238A CN102004932A CN 102004932 A CN102004932 A CN 102004932A CN 201010546238 CN201010546238 CN 201010546238 CN 201010546238 A CN201010546238 A CN 201010546238A CN 102004932 A CN102004932 A CN 102004932A
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Abstract
The invention discloses an RFID (radio frequency identification device) synchronous system with multiple read-write units. The RFID synchronous system comprises multiple read-write units, a synchronous control device for generating synchronous signals and transmitting the synchronous signals to the multiple read-write units, and a computer connected with the multiple read-write units, wherein the computer is used for receiving the information of the read-write units and carrying out subsequent treatment; the read-write units are provided with the same constituent parts and respectively comprise a reader-writer, a master controller, one to multiple control units, one to multiple antenna arrays and multiple labels; the reader-writers define the read-write starting point, time and sequence of one to multiple control units; the master controllers receive read-write commands and allocate the read-write commands to one to multiple control units; each antenna array comprises one to multiple antennas; and the control units transmit the read-write command signals in the region, activate the labels in the region and transmit coding information to the reader-writers. The synchronous system belongs to the technical field of RFID and can be widely applied to the occasion that the multiple reader-writers are synchronously operated.
Description
Technical field
The present invention relates to the RFID location technology, particularly a kind of a plurality of rfid interrogators read while write and do not produce the method that interferes with each other.
Background technology
RFID is a kind of contactless recognition technology of utilizing radiofrequency signal to carry out wireless transmission, and the basic composition of existing RFID location recognition system is made up of rfid interrogator, antenna and label three parts.Antenna is as the usefulness that transmits and receives signal, and rfid interrogator and label utilize radiofrequency signal to carry out the space coupling by antenna, realize contactless data transfer, thereby read and write label information.RFID can connect a computer, finishes various statistic or control information etc. by installed software in the computer.
The RFID technology is widely used in all trades and professions such as logistics, supply chain management, production management, shelf management.For pick up speed, can adopt a plurality of read write lines to work simultaneously usually.
For example, in a RFID library management system, 100 bookshelves are arranged, each bookshelf has tow sides, and each face has 10 layers up and down.Such library is managed, if only use a read write line, speed will be very slow.So consider with 200 read write lines, each read write line is responsible for 10 layers the read-write management up and down on the bookshelf face.
Again for example, in a RFID garage parking management system, 50 zones are arranged, there are 10 parking stalls in each zone.Can use 50 read write lines, the label information of each 10 parking stall of read write line read-write.
When a plurality of read write lines were worked simultaneously, each read write line was read and write all labels in certain zone.But, can clash between each read write line, perhaps be called the phase mutual interference, certain regional read write line excites other regional labels, can be read by other regional read write lines, perhaps because the read-write radiofrequency signal that the read write line of adjacent area sends interferes with each other, because the read-write radiofrequency signal is more intense, easily, cause and misread maybe and can not read and write, cause the recognition efficiency decline of whole rfid system with also at work the reception of different read write lines of adjacent area.
Fig. 1 shows the principle of read write line conflict.R1 is the read-write scope of read write line A, and R2 is the read-write scope of read write line B, and R1 and R2 have lap.A and b are the label that is in the overlapping scope.A1 issues the read-write of label a for read write line A, and A2 issues the answer signal of read write line A for label a; B1 issues the read-write of label b for read write line B, and B2 issues the answer signal of read write line B for label b.When label a replys read write line A, when sending the A2 signal, sending read-write B1 this moment as if read write line B, the signal that this moment, read write line A received is the overlapped signal of A2 and B1, causes and can not read and write.Equally, when label b replys read write line B, when sending the B2 signal, sending read-write A1 this moment as if read write line A, the signal that this moment, read write line B received is the overlapped signal of B2 and A1, causes and can not read and write.The collision problem that this occurs when only being 2 read write lines, if there are 100 read write lines to work simultaneously, the read write line collision problem will be very outstanding.
Some researchs have been carried out in order to solve the read write line collision problem in the RFID field both at home and abroad.The approach that solves mainly passes through time-sharing work or is that different read write lines distribute different channels.For example: DCS, colowave, csma scheduling algorithm are realized time division multiple access (TDMA); LLCR, WLLC scheduling algorithm are realized space division multiple access; Hi-Q, figure coloring algorithm are realized the method for time-division, frequency division combination.These methods all have a lot of defectives, for example: based on the method for time division multiple access (TDMA), have only a read write line in running order at one time; Based on frequency division multiple access, problem fully can not manage conflict; Based on time-division, frequency division combination, algorithm is complicated, and the operational efficiency of entire system is affected.
Summary of the invention
The present invention will solve the as above defective of prior art, and a kind of RFID mutiread r/w cell synchro system is provided, and when a plurality of rfid interrogators are worked simultaneously, does not produce the phase mutual interference.
The present invention solves above-mentioned technical matters by following technical proposals: a kind of RFID mutiread r/w cell synchro system, it is characterized in that, and comprising:
A plurality of read-write cells;
Sync control device produces synchronizing signal, sends to this a plurality of read-write cells;
Computer software connects this a plurality of read-write cells, receives the information that this read-write cell reads, and carries out subsequent treatment;
Each this read-write cell has identical ingredient, comprises: read write line, master controller, one or more control module, one or more aerial array, a plurality of label;
This sync control device definition and control read-write starting point, duration and the order of this one or more the control module of these a plurality of read write lines, this read-write duration equals to read and write these all labels of zone when regional interior label quantity quota maximum duration adds respective redundant again, and the read-write duration of all control modules, read-write starting point are all identical with the read-write order; This read write line emission read write command;
Master controller is connected with this read write line, receives this read write command, according to the order of this read write line defined, distributes to this one or more control module;
In one or more control module of one or more aerial array and this each is connected;
Each aerial array is made up of one to multiple antenna, this control module is an one to multiple antenna assignment emissive power, coordinate this one to multiple antenna, read write command signal in this control module emission one's respective area, activate the label in the one's respective area, the label coding information in the transmission one's respective area is to this read write line.
In one of them embodiment of the present invention, this sync control device is the software that is installed in this computing machine, and each read write line has a software synchronization thread, read-write cell of each thread control, and a plurality of threads are synchronous.
In one of them embodiment of the present invention, this sync control device is an external clock.
The present invention compared with prior art has following advantage:
Many read write lines can be worked simultaneously, no phase mutual interference; The rfid interrogator operating rate is fast, efficient is high.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is the synoptic diagram of read write line conflict;
Fig. 2 is a composition structural representation of the present invention;
Fig. 3 is the detailed composition synoptic diagram of read-write cell of the present invention.
Embodiment
Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing.
Referring to Fig. 2 and Fig. 3, be composition synoptic diagram of the present invention, the present invention comprises: sync control device 106, computing machine 107, a plurality of read-write cell 108.Each read-write cell has identical ingredient, comprises: read write line 101, master controller 102, a 1-n control module 103, a 1-n aerial array 104, a plurality of label 105.
Read write line 101 has defined each read-write starting point, duration and the order in 1-n the control module 103.This read-write duration equals to read and write these all labels of zone when regional interior label quantity quota maximum duration adds respective redundant again.The read-write duration of all control modules 103, read-write starting point and read-write order are all identical.
Read write line 101 connects master controller 102, sends mutual control information, and this control information is a kind of address control instruction, and its form is the mutual gauge tap of ID address assignment.
Each read write line 101 all connects computing machine 107 by various interface, and the information transmission after the demodulation to computing machine 107, is finished work such as control corresponding, management or statistics.
In 1-n control module 103 each all is connected with an aerial array 104, and 1-n control module 103 is combined into matrix, and the read write command signal in the control module 103 emission one's respective areas is with the label in the activation one's respective area.
In 1-n aerial array 104 each is made of 1-m root antenna, all labels in each aerial array 104 certain specific region of corresponding read-write; Control module 103 is a 1-m root antenna assignment emissive power, coordinates 1-m root antenna, aerial array 104 self-adaptations, and the read write command signal in the control module 103 emission one's respective areas is to activate the label in the one's respective area.
When certain the root antenna in the 1-m root antenna runs into bulk metal class material, this root antenna self-adaptive that is connected with control module 103 changes the impedance of antenna, the emissive power that reduces this root antenna is to reduce the wastage, simultaneously other antenna emissive power increases, keep total emissive power of aerial array 104 constant, it is in a basic balance to reach the magnetic field that distributes in the zone, and the intensity that transmits is constant substantially.
In one of them embodiment of the present invention, the read-write starting point of each in 1-n control module 103, duration and order also can trigger master controller by external clock and control.
In one of them embodiment of the present invention, sync control device 106 is for being installed in the software in the computing machine 107.Each read write line has a software synchronization thread, and thread can be a plurality of, and a plurality of threads are synchronous.Read-write cell of each thread control.This software sends a trigger pip, controls each read write line from starting point, and read-write duration according to the rules and order are started working.
In another one embodiment of the present invention, sync control device 106 is an external clock.This external clock connects the interrupt interface of each read write line 101.This external clock whenever sends a triggering, and each read write line is promptly from starting point, and read-write duration according to the rules and order are started working.Also the may command master controller is from starting point for same this external clock, and read-write duration according to the rules and order are started working.If external clock is synchronous, just do not need software control.
In another one embodiment of the present invention, the look-at-me that this external clock sends triggers each read write line 101 from any identical starting point, and read-write duration according to the rules triggers once the step further.
Those of ordinary skills are to be understood that any device that can send certain signal all can be used as sync control device 106, for example the external clock reset trigger, realize clock interruption etc. by the AD signal.
In a plurality of read-write cell of the present invention, be synchronous in certain read-write cell, other read-write cell both can be synchronous, also can be asynchronous.For example a read-write cell is in 1 building work, and another read-write cell does not produce interference mutually in 2 building work, and when the read-write cell in the 1st building was synchronous, the read-write cell in the 2nd buildings can be asynchronous.
Specify enforcement of the present invention in order more to be expressly understood the present invention, to give one example:
For example, in a RFID library management system, 100 bookshelves of parallel side by side placement, each bookshelf has tow sides, and each face has 10 layers up and down.The present invention has 100 read-write cells to work simultaneously, has 20 control modules in each read-write cell.The reading writing working of all labels 105 of all layers on the pros and cons of each read write line 101 responsible bookshelf.Wherein, ground floor is responsible for by first control module, and the second layer is responsible for by second control module, by that analogy.Each read write line 101 all connects computing machine 107 and sync control device 106.When sync control device 106 sent synchronizing signal, each control module began reading writing working according to starting point, read-write duration and the order of read write line regulation.Therefore guaranteed at any time, each read-write cell work synchronously, avoided the read write line conflict.When for example read-write cell 1 was in positive the 5th layer work, read-write cell 2 also was in positive the 5th layer working stage.And read-write cell 1 is when being in the working stage of the 6th layer of reverse side, and read-write cell 2 also is in the working stage of the 6th layer of reverse side.Because bookshelf read-write cell 1 is parallel side by side placements with bookshelf read-write cell 2, their 2 cell operation faces can not occur in opposite work all the time, and one side is arranged all the time between the workplace of 2 unit less than layer at reading writing working, so quite be 2 screen layers between the cell operation face, therefore label information promptly can not misread, and can not cause the problem that can not read yet.
Master controller 102 can be the Single Chip Microcomputer (SCM) program controller.
From as above illustrating as seen, use the present invention, a plurality of read write lines can be worked simultaneously and do not produced conflict.Utilization rate and speed have been improved.
The present invention also has an advantage: can interrupt the read-write process of reader at any time, read the specific region targetedly.
RFID mutiread r/w cell synchro system of the present invention has following characteristics:
(1) speed is fast.
(2) utilization rate height.
(3) can suspend at any time.
(4) can read and write certain appointed area at any time pointedly.
(5) the present invention is widely used in the intelligent management in retail, logistics, storage, medicine, library etc.
(6) no read write line conflict.
The above just for convenience of description with understand the present invention, in the spiritual category that does not break away from the present invention's creation, the various simple conversion that those skilled in the art did of being familiar with this technology still belongs to protection scope of the present invention with modification.
Claims (10)
1. a RFID mutiread r/w cell synchro system is characterized in that, comprising:
A plurality of read-write cells;
Sync control device produces synchronizing signal, sends to this a plurality of read-write cells;
Computer software connects this a plurality of read-write cells, receives the information that this read-write cell reads, and carries out subsequent treatment;
Each this read-write cell has identical ingredient, comprises: read write line, master controller, one or more control module, one or more aerial array, a plurality of label;
This sync control device definition and control read-write starting point, duration and the order of this one or more the control module of these a plurality of read write lines, this read-write duration equals to read and write these all labels of zone when regional interior label quantity quota maximum duration adds respective redundant again, and the read-write duration of all control modules, read-write starting point are all identical with the read-write order; This read write line emission read write command;
Master controller is connected with this read write line, receives this read write command, according to the order of this read write line defined, distributes to this one or more control module;
In one or more control module of one or more aerial array and this each is connected;
Each aerial array is made up of one to multiple antenna, and this control module is an one to multiple antenna assignment emissive power, coordinates this one to multiple antenna, makes this aerial array self-adaptation; Read write command signal in this control module emission one's respective area activates the label in the one's respective area, and the label coding information in the transmission one's respective area is to this read write line.
2. RFID mutiread r/w cell synchro system according to claim 1, it is characterized in that this sync control device is the software that is installed in this computing machine, each read write line has a software synchronization thread, read-write cell of each thread control, a plurality of threads are synchronous.
3. RFID mutiread r/w cell synchro system according to claim 2 is characterized in that this synchronizing signal is a trigger pip, and this trigger pip is controlled each this read write line from starting point, and read-write duration according to the rules and order are started working.
4. RFID mutiread r/w cell synchro system according to claim 1 is characterized in that this sync control device is an external clock.
5. RFID mutiread r/w cell synchro system according to claim 4 is characterized in that this external clock connects the interrupt interface of each this read write line.
6. RFID mutiread r/w cell synchro system according to claim 5, it is characterized in that, this synchronizing signal is the look-at-me that external clock sends, and this look-at-me triggers each this read write line from any identical starting point, and read-write duration according to the rules and order are started working.
7. RFID mutiread r/w cell synchro system according to claim 5, it is characterized in that this synchronizing signal is the look-at-me that external clock sends, this look-at-me triggers each this read write line from any identical starting point, read-write duration according to the rules triggers once the step further.
8. multiple-unit combined antenna array RFID according to claim 1 location recognition system is characterized in that this master controller adopts multilayer electronic control.
9. multiple-unit combined antenna array RFID according to claim 1 location recognition system is characterized in that this master controller is the Single Chip Microcomputer (SCM) program controller.
10. multiple-unit combined antenna array RFID according to claim 9 location recognition system is characterized in that this master controller is the logical circuit controller.
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| CN103177276A (en) * | 2013-04-07 | 2013-06-26 | 南京大学 | Cargo positioning method and system based on adaptive adjustment antenna power |
| CN104658308A (en) * | 2013-11-15 | 2015-05-27 | 国民技术股份有限公司 | Carport monitoring device array, car-mounted device, car management method and system |
| CN104700626A (en) * | 2013-12-05 | 2015-06-10 | 国民技术股份有限公司 | Low-frequency detecting device and vehicle in-position identification device, system and method |
| CN107871148A (en) * | 2017-11-28 | 2018-04-03 | 上海坤锐电子科技有限公司 | A kind of acquisition methods of merchandise news, storage medium and vending system |
| CN111914582A (en) * | 2020-09-29 | 2020-11-10 | 江苏东大集成电路系统工程技术有限公司 | RFID identification method suitable for fast moving object |
| CN112232095A (en) * | 2020-09-28 | 2021-01-15 | 南京小牛智能科技有限公司 | Anti-interference method and device for multiple RFID card readers |
| CN113043899A (en) * | 2021-03-25 | 2021-06-29 | 开迈斯新能源科技有限公司 | Charging method and system based on radio frequency identification technology |
| CN115206016A (en) * | 2022-06-17 | 2022-10-18 | 成都联星技术股份有限公司 | Accurate and efficient bidirectional access control method based on RFID technology |
| CN117077717A (en) * | 2023-08-16 | 2023-11-17 | 广州浩安智能科技有限公司 | RFID antenna positioning and indicating system and method for open shelf |
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| CN103177276A (en) * | 2013-04-07 | 2013-06-26 | 南京大学 | Cargo positioning method and system based on adaptive adjustment antenna power |
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| CN113043899A (en) * | 2021-03-25 | 2021-06-29 | 开迈斯新能源科技有限公司 | Charging method and system based on radio frequency identification technology |
| CN115206016A (en) * | 2022-06-17 | 2022-10-18 | 成都联星技术股份有限公司 | Accurate and efficient bidirectional access control method based on RFID technology |
| CN117077717A (en) * | 2023-08-16 | 2023-11-17 | 广州浩安智能科技有限公司 | RFID antenna positioning and indicating system and method for open shelf |
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