CN107038764A - A kind of attendance checking system based on RFID - Google Patents
A kind of attendance checking system based on RFID Download PDFInfo
- Publication number
- CN107038764A CN107038764A CN201610575739.4A CN201610575739A CN107038764A CN 107038764 A CN107038764 A CN 107038764A CN 201610575739 A CN201610575739 A CN 201610575739A CN 107038764 A CN107038764 A CN 107038764A
- Authority
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- China
- Prior art keywords
- read
- active card
- write cell
- rfid
- control unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000004891 communication Methods 0.000 claims abstract description 19
- 230000000284 resting effect Effects 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000000546 pharmaceutical excipient Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
- G07C1/10—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people together with the recording, indicating or registering of other data, e.g. of signs of identity
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
Abstract
The present invention relates to the communications field, more particularly to a kind of attendance checking system based on RFID, it is characterised in that the active card is additionally provided with wake-up circuit；The active card uses 5.8GHz active RFID card；Also include at least one read-write cell with active card wireless telecommunications, the read-write cell uses ASK modulated signals to wake up the active card within a preset range with the forms of broadcasting, so that the mode of operation of active card is converted to working condition by resting state, and active card when gathering in running order is with the authentication information and information about power of predetermined period Mode Launch, and reception signal strength instruction data when recording time when active card is communicated with read-write cell and record with active card communication.The present invention compared with prior art, using the active card provided with wake-up circuit, realizes that the mode of operation of active card switches between resting state and working condition, reduces the power consumption of active card, extend service life.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of attendance checking system based on RFID.
Background technology
With pay attention to day by day of the people to safety problem, what in various gateways, progress authentication or discrepancy were recorded will
Ask and increasingly popularize, such as meeting-place admission record, school's discrepancy school management.
Current wireless Non-contact attendance system mainly uses high frequency or hyperfrequency (UHF) REID.It is high
Frequency technology reading/writing distance is usually less than 1 meter, is adapted to the smaller gateway of flow of the people, such as：The scene that personnel can pass through one by one.
Current super high frequency technique mainly uses wireless communication frequency band for 2.4GHz ultra-high frequency band, and usual reading/writing distance can be as far as
100 meters, it is primarily adapted for use in the larger gateway of flow of the people.Although 2.4GHz ultra-high frequency band is with excellent covering performance,
But also result in simultaneously antenna read-write region it is excessive, after antenna to sensitivity it is higher the problems such as.This is needed for directional detection
The scene asked such as school gateway personnel detection etc., will cause to misread with walking direction mistake, the accuracy rate of identification is relatively low.
The existing RFID attendance checking systems based on 2.4GHz frequency ranges, active card terminal chip always works at periodic emission
State, therefore its average power consumption is larger, service life is restricted.Therefore a kind of method of compromise is to coordinate 125kHz this low
Frequency wireless technology carries out near field activation and waken up, and need to also bury coil in the ground bottom surface of respective regions, such a process increases material list
Cost and site operation cost, and be limited to the 125kHz inductance volume for being used as antenna, often this compound active card
Thickness ratio is larger, and Consumer's Experience effect is poor.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art to be intended to improve identification accuracy there is provided one kind, reduce and have
The power consumption of source card terminal core, extends the attendance checking system based on RFID of its service life.
To achieve the above object, a kind of attendance checking system based on RFID is designed, including control unit, server, record have
The active card of authentication information, described authentication information includes No. ID with the active card unique match, the work of the active card
Operation mode includes resting state and working condition, it is characterised in that
The active card is additionally provided with wake-up circuit；The active card uses 5.8GHz active RFID card；
Also include at least one read-write cell with active card wireless telecommunications, the read-write cell uses ASK modulated signals
To wake up the active card within a preset range with the forms of broadcasting, so that the mode of operation of active card is converted to by resting state
Working condition, and active card when gathering in running order is with the authentication information and information about power of predetermined period Mode Launch,
And reception signal strength instruction data when recording time when active card is communicated with read-write cell and record with active card communication；
Time when described authentication information, information about power, communication, receive signal strength and indicate that data constitute transmission information；
After active card leaves preset range, the mode of operation of active card is converted to resting state by working condition, and stops
Only launch authentication information and information about power；
Described control unit, connects the read-write cell, the transmission information to receive read-write cell upload；And extract
Time when authentication information in transmission information and described communication forms the attendance data of the active card；
Described server, connects described control unit, enters to store the attendance data, and to the attendance data
Row statistics, inquiry and push.
Described ASK modulated signals use ASK square-wave modulation signals.
The read-write cell includes setting up separately the first read-write cell, the second read-write cell in gateway both sides, and described the
One read-write cell is connected described control unit, or the first described reading using Ethernet in a parallel fashion with the second read-write cell
R/w cell is connected described control unit with bus mode with the second read-write cell using RS485；
The first described read-write cell and the second read-write cell are provided with different reception threshold values；
Described control unit according to active card respectively with the first read-write cell, the second read-write cell communicate when time,
Judge the direct of travel of active card.
The judgement of described direct of travel is：
According to time order and function order, if the active card that control unit is recorded is followed successively by and is introduced into the first read-write cell and sets
The first fixed predeterminable area, further out the first predeterminable area, enters back into the second predeterminable area of the second read-write cell setting, then from
The second predeterminable area is opened, then is judged as direction of entering；
According to time order and function order, if the active card that control unit is recorded is followed successively by and is introduced into the second read-write cell and sets
The second fixed predeterminable area, further out the second predeterminable area, enters back into the first predeterminable area of the first read-write cell setting, then from
The first predeterminable area is opened, then is judged as direction of going out.
The first described read-write cell is at least provided with one, and the second described read-write cell is at least provided with one.
Described control unit and the server wireless connection or wired connection.
Described wired connection uses Ethernet or RS485 or optical fiber.
Described wireless connection is using any of 2G, 3G or 4G.
The read-write cell uses 5.8GHz multiwire antenna.
The present invention compared with prior art, using the active card provided with wake-up circuit, is entered by it or leaves read-write list
The preset range of member, realizes that the mode of operation of active card switches between resting state and working condition, reduces active card
Power consumption, extends service life；And active card size is smaller, it is easy to carry；Gathered using control unit according to read-write cell
Information is arranged, and to obtain accurate attendance data, improves the degree of accuracy of work attendance.
Brief description of the drawings
Fig. 1 is the operation principle block diagram of the invention in one embodiment.
Operation principle block diagrams of the Fig. 2 for the present invention in another embodiment.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, belongs to this
Invent the scope of protection.
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
Embodiment 1
Referring to Fig. 1, a kind of attendance checking system based on RFID of the present invention, including control unit, server, record have certification letter
The active card of breath, described authentication information includes No. ID with the active card unique match, the mode of operation of the active card
Including resting state and working condition, active card uses 5.8GHz active RFID card in this example；
The active card is additionally provided with wake-up circuit；
Also include at least one read-write cell with active card wireless telecommunications, the read-write cell uses ASK modulated signals
To wake up the active card within a preset range with the forms of broadcasting, so that the mode of operation of active card is converted to by resting state
Working condition, and active card when gathering in running order is with the authentication information and information about power of predetermined period Mode Launch,
And reception signal strength instruction data when recording time when active card is communicated with read-write cell and record with active card communication；
Time when described authentication information, information about power, communication, receive signal strength and indicate that data constitute transmission information；
After active card leaves preset range, the mode of operation of active card is converted to resting state by working condition, and stops
Only launch authentication information and information about power；
Described control unit, connects the read-write cell, the transmission information to receive read-write cell upload；And extract
Time when authentication information in transmission information and described communication forms the attendance data of the active card；
Described server, connects described control unit, enters to store the attendance data, and to the attendance data
Row statistics, inquiry and push, are such as pushed to parent by the work attendance situation of student, are easy to allow parent to know oneself child turnover
The whereabouts in school.
5.8GHz multiwire antenna excipient technology is used in this example, the day of good excipient can be obtained in less size
Line, communication zone can be controlled well, improve the accuracy of collection information.
In this example, the mode of operation of active card by resting state can be converted to work shape in the preset range of read-write cell
State, is converted to resting state by working condition again when active card is left in preset range, reduces the power consumption of active card, extends
Its service life, and its size is smaller is easy to carry, Consumer's Experience effect is good；The letter that control unit is uploaded according to read-write cell
Breath is arranged, and to obtain accurate attendance data, improves the degree of accuracy of work attendance.
In this example, active card can be the card with identity information that user wears, and it has the ID of unique identification
Number, for the two-way communication between completion and read-write cell, there is provided authentication information.Usually in a dormant state, at it
It when 5.8GHz multiwire antenna communicates overlay area, can be waken up to working condition, complete many oscillators day with 5.8GHz
Two-way communication between line, enters resting state after away from overlay area.
Embodiment 2
Referring to Fig. 2, a kind of shared scene in gateway is applied to, if configuring single read-write cell, it is impossible to enter
Row comes in and goes out walking direction, and described in this example is to coordinate to carry out judging that user enters the situation of outgoing direction using two read-write cells,
If certainly larger occasion, can also be set multiple.
Read-write cell described in this example includes setting up the first read-write cell, the second read-write cell in gateway both sides, institute separately
The first read-write cell stated is connected described control unit using Ethernet in a parallel fashion with the second read-write cell, or described
The first read-write cell described control unit is connected using RS485 with bus mode with the second read-write cell；Described first is read
R/w cell and the second read-write cell are provided with different reception threshold values.In the present invention, the threshold value of reception is related to coverage,
Threshold value is too small, and coverage just becomes big, it is necessary to according to actual scene settings, it is therefore an objective to while increase covering, it is to avoid two
The coverage distance of read-write cell is overlapping.
In this example, when the personnel for carrying active card walk close to from distant place and reach the overlay area of the first read-write cell,
Namely in Fig. 2 during dashed region, active card receives the specific broadcast singal of the first read-write cell, namely is sent with the forms of broadcasting
Wake-up signal, the wake-up circuits of such as 14kHz ASK modulated signal active cards detects receiving power and surpasses within a preset range
The reception threshold value of setting is crossed, wake-up interrupts are provided, activation active card enters working condition；Active card enters periodic emission state,
Actively launch No. ID, the information about power of itself to the first read-write cell；No. ID, electricity letter of the first read-write cell record active card
Time and reception signal strength when breath, active card and the Current communications of the first read-write cell indicate data RSSI；Active card from
The overlay area of the first read-write cell is opened, active card receives the wake-up thresholding that ASK strength of modulating signals are less than its setting, into not
Dormancy state, stops transmitting authentication information and information about power, and relevant transmission information is sent single to control by the first read-write cell again
Member.
Then when the personnel for carrying active card walk close to from distant place and reach the overlay area of the second read-write cell, namely Fig. 2
During middle dashed region, active card receives the specific broadcast singal of the second read-write cell, and the wake-up circuit of active card, which is detected, to be connect
The reception threshold value that power exceedes setting is received, wake-up interrupts are provided, activation active card enters working condition；Active card into the cycle send out
State is penetrated, No. ID, the information about power of itself are actively launched to the second read-write cell；Second read-write cell records the ID of active card
Number, the Current communications of information about power, active card and the second read-write cell when time and receive signal strength and indicate data RSSI.
Active card leaves the overlay area of the second read-write cell, and active card receives the wake-up door that ASK strength of modulating signals are less than its setting
Limit, into resting state, stops transmitting authentication information and information about power, the second read-write cell by relevant transmission information send to
Control unit.So far realize that one unidirectionally enters step；It is on the contrary then be to leave, complete one and enter exit pattern.
Namely the judgement of described direct of travel is：
According to time order and function order, if the active card that control unit is recorded is followed successively by and is introduced into the first read-write cell and sets
The first fixed predeterminable area, further out the first predeterminable area, enters back into the second predeterminable area of the second read-write cell setting, then from
The second predeterminable area is opened, then is judged as direction of entering；
According to time order and function order, if the active card that control unit is recorded is followed successively by and is introduced into the second read-write cell and sets
The second fixed predeterminable area, further out the second predeterminable area, enters back into the first predeterminable area of the first read-write cell setting, then from
The first predeterminable area is opened, then is judged as direction of going out.
Control unit is by the first read-write cell when No. ID of active card, turnover gateway and the second read-write cell in this example
The information such as time are uploaded to server, and formation can judge the attendance information into outgoing direction.
Control unit and server can use wireless connection in this example, such as use wireless 2G, or in 3G, or 4G it is any
The communication planted.
Control unit can also use wired connection with server, such as use wired Ethernet, or RS485, or optical fiber
Mode.
Preferred embodiments of the present invention are the foregoing is only, embodiments of the present invention and protection model is not thereby limited
Enclose, to those skilled in the art, should can appreciate that what all utilization description of the invention and diagramatic content were made
Scheme obtained by equivalent substitution and obvious change, should be included in protection scope of the present invention.
Claims (9)
1. a kind of attendance checking system based on RFID, including control unit, server, record have the active card of authentication information, described
Authentication information include No. ID with the active card unique match, the mode of operation of the active card includes resting state and work
Make state, it is characterised in that
The active card is additionally provided with wake-up circuit；The active card uses 5.8GHz active RFID card；
Also include at least one read-write cell with active card wireless telecommunications, the read-write cell is used to using ASK modulated signals
The active card is waken up with the forms of broadcasting within a preset range, so that the mode of operation of active card is converted to work by resting state
State, and active card when gathering in running order is with the authentication information and information about power of predetermined period Mode Launch, and note
Reception signal strength when recording time when active card is communicated with read-write cell and record with active card communication indicates data；It is described
Authentication information, information about power, communication when time, receive signal strength indicate data constitute transmission information；
After active card leaves preset range, the mode of operation of active card is converted to resting state by working condition, and stops hair
Penetrate authentication information and information about power；
Described control unit, connects the read-write cell, the transmission information to receive read-write cell upload；And extract transmission
Time when authentication information in information and described communication forms the attendance data of the active card；
Described server, connects described control unit, is united to store the attendance data, and to the attendance data
Meter, inquiry and push.
2. a kind of attendance checking system based on RFID as claimed in claim 1, it is characterised in that described ASK modulated signals are adopted
Use ASK square-wave modulation signals.
3. a kind of attendance checking system based on RFID as claimed in claim 1, it is characterised in that
The read-write cell includes setting up the first read-write cell, the second read-write cell in gateway both sides, the first described reading separately
R/w cell is connected described control unit, or the first described read-write list using Ethernet in a parallel fashion with the second read-write cell
Member is connected described control unit with bus mode with the second read-write cell using RS485；
The first described read-write cell and the second read-write cell are provided with different reception threshold values；
Described control unit according to active card respectively with the first read-write cell, the second read-write cell communicate when time, judge
The direct of travel of active card.
4. a kind of attendance checking system based on RFID as claimed in claim 3, it is characterised in that
The judgement of described direct of travel is：
According to time order and function order, if the active card that control unit is recorded, which is followed successively by, is introduced into the setting of the first read-write cell
First predeterminable area, further out the first predeterminable area, enters back into the second predeterminable area of the second read-write cell setting, further out the
Two predeterminable areas, then be judged as direction of entering；
According to time order and function order, if the active card that control unit is recorded, which is followed successively by, is introduced into the setting of the second read-write cell
Second predeterminable area, further out the second predeterminable area, enters back into the first predeterminable area of the first read-write cell setting, further out the
One predeterminable area, then be judged as direction of going out.
5. a kind of attendance checking system based on RFID as claimed in claim 3, it is characterised in that the first described read-write cell is extremely
One is provided with less, and the second described read-write cell is at least provided with one.
6. a kind of attendance checking system based on RFID as claimed in claim 1, it is characterised in that described control unit and the clothes
Device wireless connection of being engaged in or wired connection.
7. a kind of attendance checking system based on RFID as claimed in claim 6, it is characterised in that described wired connection use with
Too net or RS485 or optical fiber.
8. a kind of attendance checking system based on RFID as claimed in claim 5, it is characterised in that described wireless connection is use
Any of 2G, 3G or 4G.
9. a kind of attendance checking system based on RFID as described in any one of claim 1~8, it is characterised in that the read-write list
Member uses 5.8GHz multiwire antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610575739.4A CN107038764A (en) | 2016-07-21 | 2016-07-21 | A kind of attendance checking system based on RFID |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610575739.4A CN107038764A (en) | 2016-07-21 | 2016-07-21 | A kind of attendance checking system based on RFID |
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| Publication Number | Publication Date |
|---|---|
| CN107038764A true CN107038764A (en) | 2017-08-11 |
Family
ID=59533076
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| CN201610575739.4A Pending CN107038764A (en) | 2016-07-21 | 2016-07-21 | A kind of attendance checking system based on RFID |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108038931A (en) * | 2017-12-26 | 2018-05-15 | 佛山市道静科技有限公司 | A kind of attendance checking system based on RFID |
| CN109684890A (en) * | 2018-12-26 | 2019-04-26 | 江苏恒宝智能系统技术有限公司 | A kind of method and device reducing power consumption |
| CN110910524A (en) * | 2019-12-20 | 2020-03-24 | 腾讯科技（深圳）有限公司 | Automatic sign-in system, method, device, electronic equipment and computer storage medium |
| CN113256831A (en) * | 2021-05-10 | 2021-08-13 | 杭州魔点科技有限公司 | Bluetooth non-inductive attendance checking method, asset safety management method and system |
| CN113379012A (en) * | 2021-05-31 | 2021-09-10 | 长沙中天电子设计开发有限公司 | Method, system and equipment for judging advancing state of personnel in school door area |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093556A (en) * | 2007-07-27 | 2007-12-26 | 北京华大恒泰科技有限责任公司 | Active radio frequency identification label, system and reading / writing method |
| CN101968901A (en) * | 2010-07-05 | 2011-02-09 | 健雄职业技术学院 | Wireless awakening active student label identification system and identification method thereof |
| CN102982586A (en) * | 2012-11-23 | 2013-03-20 | 深圳市中科南方科技发展有限公司 | Electronic attendance system used by students |
| CN203192045U (en) * | 2013-01-08 | 2013-09-11 | 江苏海事职业技术学院 | Radio frequency identification (RFID) attendance management device |
| CN104299279A (en) * | 2013-07-20 | 2015-01-21 | 郑州学生宝电子科技有限公司 | Radiofrequency technology-based special electronic attendance checking system for students |
| CN204856542U (en) * | 2015-07-16 | 2015-12-09 | 武汉瑞纳捷电子技术有限公司 | Active radio -frequency card and system with passive awakeing up and dormancy function |
| CN205920514U (en) * | 2016-07-21 | 2017-02-01 | 上海先斯智能技术有限公司 | Attendance equipment based on RFID |
-
2016
- 2016-07-21 CN CN201610575739.4A patent/CN107038764A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093556A (en) * | 2007-07-27 | 2007-12-26 | 北京华大恒泰科技有限责任公司 | Active radio frequency identification label, system and reading / writing method |
| CN101968901A (en) * | 2010-07-05 | 2011-02-09 | 健雄职业技术学院 | Wireless awakening active student label identification system and identification method thereof |
| CN102982586A (en) * | 2012-11-23 | 2013-03-20 | 深圳市中科南方科技发展有限公司 | Electronic attendance system used by students |
| CN203192045U (en) * | 2013-01-08 | 2013-09-11 | 江苏海事职业技术学院 | Radio frequency identification (RFID) attendance management device |
| CN104299279A (en) * | 2013-07-20 | 2015-01-21 | 郑州学生宝电子科技有限公司 | Radiofrequency technology-based special electronic attendance checking system for students |
| CN204856542U (en) * | 2015-07-16 | 2015-12-09 | 武汉瑞纳捷电子技术有限公司 | Active radio -frequency card and system with passive awakeing up and dormancy function |
| CN205920514U (en) * | 2016-07-21 | 2017-02-01 | 上海先斯智能技术有限公司 | Attendance equipment based on RFID |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108038931A (en) * | 2017-12-26 | 2018-05-15 | 佛山市道静科技有限公司 | A kind of attendance checking system based on RFID |
| CN109684890A (en) * | 2018-12-26 | 2019-04-26 | 江苏恒宝智能系统技术有限公司 | A kind of method and device reducing power consumption |
| CN109684890B (en) * | 2018-12-26 | 2022-03-29 | 江苏恒宝智能系统技术有限公司 | Method and device for reducing power consumption |
| CN110910524A (en) * | 2019-12-20 | 2020-03-24 | 腾讯科技（深圳）有限公司 | Automatic sign-in system, method, device, electronic equipment and computer storage medium |
| CN110910524B (en) * | 2019-12-20 | 2021-06-25 | 腾讯科技（深圳）有限公司 | Automatic sign-in system, method, device, electronic equipment and computer storage medium |
| CN113256831A (en) * | 2021-05-10 | 2021-08-13 | 杭州魔点科技有限公司 | Bluetooth non-inductive attendance checking method, asset safety management method and system |
| CN113379012A (en) * | 2021-05-31 | 2021-09-10 | 长沙中天电子设计开发有限公司 | Method, system and equipment for judging advancing state of personnel in school door area |
| CN113379012B (en) * | 2021-05-31 | 2022-06-21 | 长沙中天电子设计开发有限公司 | Method, system and equipment for judging advancing state of personnel in school door area |
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