CN103577857B - RFID three-dimensional detecting device and use method thereof - Google Patents
RFID three-dimensional detecting device and use method thereof Download PDFInfo
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- CN103577857B CN103577857B CN201310621221.6A CN201310621221A CN103577857B CN 103577857 B CN103577857 B CN 103577857B CN 201310621221 A CN201310621221 A CN 201310621221A CN 103577857 B CN103577857 B CN 103577857B
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Abstract
The invention relates to the technical field of RFID (Radio Frequency Identification), and in particular to a RFID three-dimensional detecting device which can effectively reduce radio frequency identification omission ratio and relieve interference among a plurality of antennas during working of a multi-antenna identification system, as well as a use method of the RFID three-dimensional detecting device. The RFID three-dimensional detecting device is characterized by further comprising a power distributor circuit, two antenna switching control modes, a first antenna group and a second antenna group, wherein the input end of the power distributor circuit is connected with the output end of a radio frequency signal transmission circuit; the power distributor circuit is used for distributing the input radio frequency signal to two routes to be output according to the ratio of 1:1; the two antenna switching control modes are respectively and correspondingly connected to output ends of the two routes of the power distributor circuit; the first antenna group and the second antenna group are respectively and correspondingly connected with the two antenna switching control modes, and respectively provided with more than two antennas; a micro-control chip is respectively connected with the two switching control modes. Compared to the prior art, the RFID three-dimensional detecting device is reasonable in structure and stable in work, and can effectively reduce radio frequency identification omission ratio and relieve interference among the antennas during the working of the multi-antenna identification system.
Description
Technical field
The present invention relates to rfid technical field of RFID, specifically one kind can effectively reduce RF identification missing inspection
The rfid three-dimensional detection device of interference between multiple antennas and its using method when rate, mitigation multiple antennas identifying system work.
Background technology
It is known that rfid REID obtains in fields such as document management, entrance guard managements more and more widely should
With existing radio frequency identification equipment typically consists of the following components: be arranged on areas adjacent to be detected radio-frequency reading-writing device,
It is fixed on the RF tag on people/thing to be detected, when people wears RF tag or article are fixed with RF tag and enter during use
Enter region to be detected, radio-frequency reading-writing device passes through to send the id information that read signal can read on RF tag, and matching management is soft
Part is it becomes possible to complete the management to processes such as personnel's discrepancy/article arrangements.
When carrying out related management using rfid identification equipment, antenna is indispensable part, and it is used for exporting radio frequency
Read signal simultaneously receives the information being returned by RF tag, and antenna is formed using coil winding, individual antenna formed magnetic field in
Between direction can there is a blind area, when this leads to single antenna work, loss is higher, in order to solve this problem, studies people
Member proposes multiple antennas detecting system, but how to avoid mutual interference problem between the multiple antennas simultaneously working and how improving to penetrate
The utilization rate of frequency signal, it is to avoid lead to testing equipment power consumption urgently to be resolved hurrily the problems such as rising because multiple antennas work simultaneously.
Content of the invention
The present invention is directed to shortcoming and defect present in prior art, proposes a kind of rational in infrastructure, working stability, Neng Gouyou
The rfid three-dimensional values of the interference between multiple antennas when effect reduces RF identification loss, mitigates the work of multiple antennas identifying system
Device and its using method.
The present invention can be reached by following measures:
A kind of rfid three-dimensional detection device, is provided with microcontroller chip, radiofrequency signal transtation mission circuit and rf signal reception electricity
Road, microcontroller chip is connected with radiofrequency signal transtation mission circuit and rf signal reception circuit respectively it is characterised in that being additionally provided with defeated
Enter to hold be connected with the output end of radiofrequency signal transtation mission circuit to export for the radiofrequency signal of input is assigned as two-way by 1:1
Power distributing circuit, the antenna switching control module of two connections corresponding with the two-way output end of power distributing circuit respectively,
The first antenna group of connection corresponding with two antenna switching control modules and the second antenna sets respectively, described first antenna group and
It is respectively equipped with plural antenna, microcontroller chip is connected with two switching control modules respectively in two antenna sets.
In the present invention, antenna switching control module is provided with radio-frequency switch circuit and the coupling being connected with radio-frequency switch circuit
The number of antenna in coupled first antenna group or the second antenna sets is corresponded in circuit, wherein antenna switching control module
Amount, is provided with one-to-one radio-frequency antenna switch and the match circuit with antenna in antenna sets of more than two-way, is used for completing to two
The switching control of individual above antenna.
The present invention is additionally provided with phase-switching circuit, and the control signal input of phase-switching circuit is connected with microcontroller chip
Connect, the input of phase-switching circuit is connected with a road output end of power distributing circuit, the input of phase-switching circuit
It is connected with switching control module, in phase-switching circuit, is provided with coupling coil, for entering the phase place of the radiofrequency signal of input
180 ° of switchings of row.
Heretofore described radiofrequency signal transtation mission circuit includes the modulation circuit being connected with microcontroller chip, with modulation circuit
The output end of the power amplification circuit that output end is connected, wherein power amplification circuit is connected with power distributing circuit, this
Bright described rf signal reception circuit includes the comparison decision circuit being connected with microcontroller chip, and output end is defeated with compare judgement
Enter and hold the demodulation circuit of intermediate frequency being connected, the envelope detection circuit that output end is connected with the input of demodulation circuit of intermediate frequency, its
The input of middle envelope detection circuit is connected with antenna through the match circuit in antenna switching control module.
It is provided with three road radio-frequency switch circuits and three tunnels coupling electricity in each antenna switching control module currently preferred
Road, is respectively equipped with three aerial coils in first antenna group and the second antenna sets.
Microcontroller chip of the present invention can be realized using arm.
The present invention also proposes a kind of using method of above-mentioned rfid three-dimensional detection device it is characterised in that including following walking
Rapid:
Step 1: first antenna group and the second antenna sets are separately mounted to the both sides in region to be detected, make two groups of antenna phases
To transmitting radiofrequency signal, the overlay area of two groups of antennas overlaps, system electrification, and device completes the loading of master data；
Step 2: radiofrequency signal is delivered to power distributing circuit by radiofrequency signal transtation mission circuit, presses 1:1 by power distributing circuit
Input signal is equally divided into phase place identical two-way radiofrequency signal by power ratio, and two-way radiofrequency signal is delivered to two antennas cuts
Change the radio-frequency switch circuit input in control module, from microcontroller chip to the output two-way antenna switching of antenna switching control module
Control signal, two-way antenna switch control signal controls each antenna switching control module Zhong mono- road radio-frequency switch circuit respectively
Conducting, makes to have respectively in first antenna group and the second antenna sets antenna in running order and penetrates to field emission to be detected
The RF tag in antenna pair region to be detected is had to be read in frequency signal, first antenna group and the second antenna sets respectively
Take；
Step 3: microcontroller chip timesharing sends switch-over control signal to two antenna switching control modules, changes antenna switching
The on off state of radio-frequency switch circuit in module, makes the plural antennae polling in first antenna group and the second antenna sets,
Ensure in certain time period, only one of which antenna launches radiofrequency signal in opposite directions respectively for first antenna group and the second antenna sets, and
The detection zone of two antennas is overlapping.
Currently preferred be respectively equipped with three radio-frequency antennas in first antenna group and the second antenna sets, respective antenna is cut
Change and in control module, be provided with the match circuit that three road radio-frequency switch circuits and three tunnels are connected one to one with radio-frequency switch circuit,
First antenna group corresponds and works in pairs simultaneously with the antenna of the second antenna sets, and microcontroller chip switches to two antennas successively
Control module sends control command, so that three pairs of antennas in first antenna group and the second antenna sets is switched successively, adjacent antenna is mutual
Mutually make up work blind area, complete the detection to region to be checked, and due to three antennas in first antenna group and the second antenna sets
Time-sharing work, can be prevented effectively from the problem of multiple antennas mutual interference.
The present invention can also send control signal by microcontroller chip to phase-switching circuit, makes first antenna group and second
The radiofrequency signal phase place of antenna sets internal antenna transmitting changes, and completes the switching of radio frequency detection range.
The present invention compared with prior art, has the advantage that
1st, can achieve that the three-dimensional omnidirectional of label reads: become aerial array using multiple antenna sets, each antennae polling work, phase
Adjacent two antennas mutually make up other side blind area, thus the three-dimensional omnidirectional realizing label within the specific limits reads, effectively reduce leakage
Inspection rate.
2nd, the scope reading label is big: replaces individual antenna, three sky line wheels using the aerial array that three antennas are formed
Ask work, each work antenna obtains whole energy of frequency read/write, so that the scope of effective magnetic field greatly increases, that is, reads
The scope of label greatly increases.
3rd, the utilization rate of read write line is high: multiple antennas use same read write line, and can obtain when each Antenna Operation
Whole energy of read write line, substantially increase the utilization rate of read write line, also solve multiple antennas simultaneously and connect multiple read write lines
Exist when working interferes problem simultaneously.
Brief description:
Accompanying drawing 1 is the structural representation of the present invention.
Accompanying drawing 2 is another kind of structural representation of the present invention.
Reference: microcontroller chip 1, radiofrequency signal transtation mission circuit 2, rf signal reception circuit 3, power distributing circuit 4,
Antenna switching control module 5, first antenna group 6, the second antenna sets 7, antenna 8, radio-frequency switch circuit 9, match circuit 10, phase place
Switching circuit 11.
Specific embodiment:
Below in conjunction with the accompanying drawings, the present invention is further illustrated.
As shown in Figure 1, the present invention proposes a kind of rfid three-dimensional detection device, is provided with microcontroller chip 1, radiofrequency signal is sent out
Power transmission road 2 and rf signal reception circuit 3, microcontroller chip 1 is electric with radiofrequency signal transtation mission circuit 2 and rf signal reception respectively
Road 3 be connected it is characterised in that be additionally provided with that input is connected with the output end of radiofrequency signal transtation mission circuit 2 for inputting
Radiofrequency signal by 1:1 be assigned as two-way output power distributing circuit 4, two defeated with the two-way of power distributing circuit 4 respectively
Go out the corresponding antenna switching control module 5 connecting in end, respectively the first antenna of connection corresponding with two antenna switching control modules 5
Group 6 and the second antenna sets 7, are respectively equipped with plural antenna 8, micro-control core in described first antenna group 6 and the second antenna sets 7
Piece is connected with two switching control modules respectively.
In the present invention antenna switching control module 5 be provided with radio-frequency switch circuit 9 and be connected with radio-frequency switch circuit 9
Sky in coupled first antenna group 6 or the second antenna sets 7 is corresponded in distribution road 10, wherein antenna switching control module 5
The quantity of line 8, is provided with one-to-one radio-frequency antenna switch circuit 9 and the match circuit with antenna in antenna sets 8 of more than two-way
10, for completing the switching control to two or more antenna.
The present invention is additionally provided with phase-switching circuit 11, the control signal input of phase-switching circuit 11 and microcontroller chip 1
It is connected, the input of phase-switching circuit 11 is connected with a road output end of power distributing circuit 4, phase-switching circuit 11
Input be connected with switching control module 5, be provided with coupling coil in phase-switching circuit 11, for will input radio frequency letter
Number phase place carry out 180 ° switching.
Heretofore described radiofrequency signal transtation mission circuit 2 includes the modulation circuit being connected with microcontroller chip 1, with modulation electricity
The output end of the power amplification circuit that road output end is connected, wherein power amplification circuit is connected with power distributing circuit, this
Invent the comparison decision circuit that described rf signal reception circuit 3 includes being connected with microcontroller chip, output end with compare judgement
The demodulation circuit of intermediate frequency that is connected of input, the envelope detection electricity that output end is connected with the input of demodulation circuit of intermediate frequency
The input on road, wherein envelope detection circuit is connected with antenna 8 through the match circuit 10 in antenna switching control module 5.
It is provided with three road radio-frequency switch circuits 9 and three tunnels coupling in each antenna switching control module 5 currently preferred
Circuit 10, is correspondingly provided with three aerial coils in first antenna group and the second antenna sets respectively.
Microcontroller chip of the present invention can be realized using arm.
The present invention also proposes a kind of using method of above-mentioned rfid three-dimensional detection device it is characterised in that including following walking
Rapid:
Step 1: first antenna group and the second antenna sets are separately mounted to the both sides in region to be detected, make two groups of antenna phases
To transmitting radiofrequency signal, the overlay area of two groups of antennas overlaps, system electrification, and device completes the loading of master data；
Step 2: radiofrequency signal is delivered to power distributing circuit by radiofrequency signal transtation mission circuit, presses 1:1 by power distributing circuit
Input signal is equally divided into phase place identical two-way radiofrequency signal by power ratio, and two-way radiofrequency signal is delivered to two antennas cuts
Change the radio-frequency switch circuit input in control module, from microcontroller chip to the output two-way antenna switching of antenna switching control module
Control signal, two-way antenna switch control signal controls each antenna switching control module Zhong mono- road radio-frequency switch circuit respectively
Conducting, makes to have respectively in first antenna group and the second antenna sets antenna in running order and penetrates to field emission to be detected
The RF tag in antenna pair region to be detected is had to be read in frequency signal, first antenna group and the second antenna sets respectively
Take；
Step 3: microcontroller chip timesharing sends switch-over control signal to two antenna switching control modules, changes antenna switching
The on off state of radio-frequency switch circuit in module, makes the plural antennae polling in first antenna group and the second antenna sets,
Ensure in certain time period, only one of which antenna launches radiofrequency signal in opposite directions respectively for first antenna group and the second antenna sets, and
The detection zone of two antennas is overlapping.
Currently preferred be respectively equipped with three radio-frequency antennas in first antenna group and the second antenna sets, respective antenna is cut
Change and in control module, be provided with the match circuit that three road radio-frequency switch circuits and three tunnels are connected one to one with radio-frequency switch circuit,
First antenna group corresponds and works in pairs simultaneously with the antenna of the second antenna sets, and microcontroller chip switches to two antennas successively
Control module sends control command, so that three pairs of antennas in first antenna group and the second antenna sets is switched successively, adjacent antenna is mutual
Mutually make up work blind area, complete the detection to region to be checked, and due to three antennas in first antenna group and the second antenna sets
Time-sharing work, can be prevented effectively from the problem of multiple antennas mutual interference.
The present invention can also send control signal by microcontroller chip to phase-switching circuit, makes first antenna group and second
The radiofrequency signal phase place of antenna sets internal antenna transmitting changes, and completes the switching of radio frequency detection range.
The present invention compared with prior art, has the advantage that
1st, can achieve that the three-dimensional omnidirectional of label reads: become aerial array using multiple antenna sets, each antennae polling work, phase
Adjacent two antennas mutually make up other side blind area, thus the three-dimensional omnidirectional realizing label within the specific limits reads, effectively reduce leakage
Inspection rate.
2nd, the scope reading label is big: replaces individual antenna, three sky line wheels using the aerial array that three antennas are formed
Ask work, each work antenna obtains whole energy of frequency read/write, so that the scope of effective magnetic field greatly increases, that is, reads
The scope of label greatly increases.
3rd, the utilization rate of read write line is high: multiple antennas use same read write line, and can obtain when each Antenna Operation
Whole energy of read write line, substantially increase the utilization rate of read write line, also solve multiple antennas simultaneously and connect multiple read write lines
Exist when working interferes problem simultaneously.
Claims (1)
1. a kind of using method of rfid three-dimensional detection device, wherein rfid three-dimensional detection device are provided with microcontroller chip, radio frequency letter
Number transtation mission circuit and rf signal reception circuit, microcontroller chip respectively with radiofrequency signal transtation mission circuit and rf signal reception electricity
Road be connected it is characterised in that be additionally provided with that input is connected with the output end of radiofrequency signal transtation mission circuit for by input
Radiofrequency signal is assigned as the power distributing circuit of two-way output, two two-way output ends with power distributing circuit respectively by 1:1
The corresponding antenna switching control module connecting, the first antenna group of connection corresponding with two antenna switching control modules and the respectively
Two antenna sets, microcontroller chip is connected with two switching control modules respectively；
Antenna switching control module is provided with radio-frequency switch circuit and the match circuit being connected with radio-frequency switch circuit,
It is provided with phase-switching circuit, the control signal input of phase-switching circuit is connected with microcontroller chip, Phase-switching electricity
The input on road is connected with a road output end of power distributing circuit, the output end of phase-switching circuit and switching control module
Being connected, in phase-switching circuit, being provided with the coupling coil for the phase place of the radiofrequency signal of input being carried out 180 ° of switchings；
Described radiofrequency signal transtation mission circuit includes the modulation circuit being connected with microcontroller chip, is connected with modulation circuit output end
Power amplification circuit, the output end of wherein power amplification circuit is connected with power distributing circuit, described rf signal reception
Circuit includes the comparison decision circuit being connected with microcontroller chip, the intermediate frequency solution that output end is connected with the input comparing judgement
Adjust circuit, the envelope detection circuit that output end is connected with the input of demodulation circuit of intermediate frequency, wherein envelope detection circuit defeated
Enter end to be connected with antenna through the match circuit in antenna switching control module；
It is provided with three road radio-frequency switch circuits and No. three match circuits, first antenna group and the in each antenna switching control module
It is correspondingly provided with three aerial coils respectively in two antenna sets；
The using method of rfid three-dimensional detection device is it is characterised in that comprise the following steps:
Step 1: first antenna group and the second antenna sets are separately mounted to the both sides in region to be detected, make two groups of antennas send out in opposite directions
Penetrate radiofrequency signal, the overlay area of two groups of antennas overlaps, system electrification, and device completes the loading of master data；
Step 2: radiofrequency signal is delivered to power distributing circuit by radiofrequency signal transtation mission circuit, presses 1:1 power by power distributing circuit
It is equally divided into phase place identical two-way radiofrequency signal than by input signal, and two-way radiofrequency signal is delivered to two antenna switching controls
Radio-frequency switch circuit input in molding block, exports two-way antenna switching control from microcontroller chip to antenna switching control module
Signal, two-way antenna switch control signal controls each antenna switching control module Zhong mono- road radio-frequency switch circuit to lead respectively
Logical, make to have respectively in first antenna group and the second antenna sets antenna in running order and to field emission radio frequency to be detected
The RF tag in antenna pair region to be detected is had to be read out in signal, first antenna group and the second antenna sets respectively；
Step 3: microcontroller chip timesharing sends switch-over control signal to two antenna switching control modules, changes antenna switch module
The on off state of middle radio-frequency switch circuit, make plural antennae polling in first antenna group and the second antenna sets it is ensured that
In certain time period, only one of which antenna launches radiofrequency signal in opposite directions respectively for first antenna group and the second antenna sets, and two
The detection zone of antenna is overlapping；
Also include sending control signal by microcontroller chip to phase-switching circuit, make sky in first antenna group and the second antenna sets
The radiofrequency signal phase place of line transmitting changes, and completes the switching of radio frequency detection range.
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| CN201310621221.6A CN103577857B (en) | 2013-11-29 | 2013-11-29 | RFID three-dimensional detecting device and use method thereof |
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| CN103577857B true CN103577857B (en) | 2017-01-18 |
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| CN103908078B (en) * | 2014-03-28 | 2016-10-26 | 北京市第一中级人民法院 | Profile storage system based on RFID |
| CN103927567A (en) * | 2014-04-17 | 2014-07-16 | 德讯科技股份有限公司 | System for realizing low-frequency multi-RFID label positioning |
| CN104966113B (en) * | 2015-07-27 | 2018-12-25 | 威海北洋电气集团股份有限公司 | The decoding of RFID read-write system and its label return signal and conflict processing method |
| CN105373752B (en) * | 2015-11-10 | 2018-10-26 | 威海北洋电气集团股份有限公司 | The three-dimensional reading device of RF tag |
| CN106539569A (en) * | 2015-12-10 | 2017-03-29 | 悦享趋势科技（北京）有限责任公司 | Wearable physiological monitoring equipment and its antenna system |
| CN105718829A (en) * | 2016-01-27 | 2016-06-29 | 北京邮电大学 | RFID based label behavior direction determining method |
| CN106778420B (en) * | 2016-12-22 | 2020-11-03 | 江苏本能科技有限公司 | Multi-channel radio frequency identification device linkage method and system |
| CN107392076B (en) * | 2017-09-07 | 2023-11-10 | 广州佳都数据服务有限公司 | Multi-antenna control circuit and multi-antenna reader-writer |
| CN108595995A (en) * | 2018-05-02 | 2018-09-28 | 北京紫光微电子系统有限公司 | A kind of detection antenna system and detection method for intermediate frequency radio-frequency identification card |
| CN109460688B (en) * | 2018-09-27 | 2021-11-09 | 威海北洋光电信息技术股份公司 | Three-dimensional settlement channel device based on delta-shaped antenna and using method thereof |
| CN111310486B (en) * | 2018-12-12 | 2023-07-14 | 航天信息股份有限公司 | Vehicle identification method and supervision equipment |
| CN109670361A (en) * | 2019-01-29 | 2019-04-23 | 杭州檀木科技有限公司 | A kind of synchronous automatic shifting phase Wireless exciters device and synchronous automatic shifting phase method |
| CN110245735A (en) * | 2019-07-05 | 2019-09-17 | 深圳市章誉物联技术有限公司 | A kind of demixing scan sense channel RFID controller |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101611416A (en) * | 2007-10-09 | 2009-12-23 | 西门子公司 | A kind of wireless radio frequency identification reader-writer and antenna switching method |
| CN102007645A (en) * | 2008-01-30 | 2011-04-06 | 弗兰威尔有限公司 | Array antenna system and algorithm applicable to rfid readers |
| CN202585745U (en) * | 2012-05-21 | 2012-12-05 | 深圳市模块科技有限公司 | Radio frequency identification (RFID) antenna |
| CN202939627U (en) * | 2012-10-30 | 2013-05-15 | 上海阿法迪智能标签系统技术有限公司 | High frequency RFID reader-writer expansion adapter |
-
2013
- 2013-11-29 CN CN201310621221.6A patent/CN103577857B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101611416A (en) * | 2007-10-09 | 2009-12-23 | 西门子公司 | A kind of wireless radio frequency identification reader-writer and antenna switching method |
| CN102007645A (en) * | 2008-01-30 | 2011-04-06 | 弗兰威尔有限公司 | Array antenna system and algorithm applicable to rfid readers |
| CN202585745U (en) * | 2012-05-21 | 2012-12-05 | 深圳市模块科技有限公司 | Radio frequency identification (RFID) antenna |
| CN202939627U (en) * | 2012-10-30 | 2013-05-15 | 上海阿法迪智能标签系统技术有限公司 | High frequency RFID reader-writer expansion adapter |
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