WO2018205767A1 - Système de protection d'entrée rfid de type ouvert pour détection d'accès et son procédé de gestion - Google Patents

Système de protection d'entrée rfid de type ouvert pour détection d'accès et son procédé de gestion Download PDF

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Publication number
WO2018205767A1
WO2018205767A1 PCT/CN2018/081261 CN2018081261W WO2018205767A1 WO 2018205767 A1 WO2018205767 A1 WO 2018205767A1 CN 2018081261 W CN2018081261 W CN 2018081261W WO 2018205767 A1 WO2018205767 A1 WO 2018205767A1
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Prior art keywords
rfid
rfid tag
antenna
access control
channel
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PCT/CN2018/081261
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English (en)
Chinese (zh)
Inventor
刘佳
陈力军
张晓聪
严颖丽
陈星宇
黄嘉琪
李珍珠
郁裕杰
荀凯
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南京大学
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Publication of WO2018205767A1 publication Critical patent/WO2018205767A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
    • G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
    • G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
    • 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
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass

Definitions

  • the invention relates to the field of RFID technology, in particular to an open RFID access control system for access detection and a processing method thereof.
  • RFID Radio Frequency Identification
  • RFID technology is an automatic identification technology based on wireless communication technology. Its basic principle is to use the RF signal and spatial coupling transmission characteristics to automatically identify the information carried by the identified object. Its biggest advantage is non-contact. Identify and recognize high-speed moving objects and identify multiple targets. RFID technology is now being used more and more widely in all industries, including supply chain management, warehouse inventory, electronic payment, secure access control, target monitoring and tracking.
  • UHF RFID system has the distinctive features of batch reading and non-line-of-sight communication, which can effectively overcome the above shortcomings and provide guarantee for improving the automation degree and throughput of the access control system.
  • the technical problem to be solved by the present invention is to provide an open RFID access control system for access detection and a processing method thereof, and to automatically read an RFID tag carried by a mobile object by using a device deployed in the access control. And discriminate the direction of the object that carries the RFID tag through the access control.
  • the present invention discloses an open RFID access control system for access detection, the access control system is installed at the side of the access passage, and includes at least one RFID reader, each of which has two or more external antennas. At least one antenna is inclined toward the channel; at least one antenna is inclined toward the channel;
  • the antenna tilted toward the incoming channel first receives the RFID tag signal, and receives the RFID tag signal after the antenna tilted toward the outgoing channel;
  • the antenna tilted toward the direction of the channel first receives the RFID tag signal, and receives the RFID tag signal after the antenna tilted toward the channel;
  • the timing of receiving the same RFID tag signal through the antennas at both ends of the access control system confirms the direction of the RFID tag signal entering and exiting the channel.
  • the present invention includes two RFID readers, centered on the access channel, and symmetrically disposed on both sides of the channel.
  • the system further includes a background server, and the RFID reader feeds back the read RFID tag signal to the background server in real time through an external antenna, including an antenna port number, a label EPC number, and a time stamp of the received signal;
  • the background server calculates the difference between the average values of the time stamp features of the same RFID tag read by the antennas at both ends of the channel according to the tag signal returned by the RFID reader, and then identifies the mapping relationship between the tag EPC number and the identity information of the object carrying the RFID tag.
  • the antenna radiates electromagnetic waves outwardly, receives signals reflected by the RFID tags and transmits them to the RFID reader.
  • the background server further includes a display interface, and the display interface displays the access situation of the access control in real time according to the information collected by the RFID reader.
  • the invention also discloses a processing method for an open RFID access control system for access detection, comprising the following steps:
  • Step 1 Record the two ends of the access control system as the A end and the B end respectively, and use an RFID reader to read the RFID tag signal passing through the access control system;
  • Step 2 classify the reflected signals of the same tag received by the antennas on one side or both sides of the channel into one class, and sort them to obtain a sequence;
  • Step 3 Calculate the sequence obtained in step 2, and obtain an average value of the time stamp features of the same RFID tag read by the antennas at both ends of the channel;
  • Step 4 Determine, according to the average value of the time stamp feature, the entry and exit of the object carrying the RFID tag.
  • the RFID tag signal includes an antenna port number ant, a tag EPC number epc, and a timestamp t, and the above information is represented as a triplet ⁇ ant, epc, t ⁇ , indicating that the antenna port number of the RFID reader is ant.
  • the EPC number received by the antenna at time t is the label signal of epc.
  • Step 2 includes the following steps:
  • Step 2-1 The ternary group obtained in the step 1 is divided according to the antenna port number and the label EPC number, and the data including the same end antenna port number and the same label EPC number is divided into one class;
  • each type of data is sorted in order of timestamp t from small to large to obtain a tag signal sequence.
  • the corresponding total time is T; set a time period of size t d (generally 100 ms), divide the sequence into time segments, and divide the entire sequence into Segment
  • triples ⁇ ant,epc,t ⁇ in the mth time period they are combined into one feature triplet ⁇ end,epc,t m ⁇ , where end represents the position of the antenna in the access control system. , that is, the A end or the B end, the epc is the label EPC number, and t m is the middle time of the time period;
  • f m represents the state of the characteristic triplet in the mth time period. If c m is present, f m takes a value of 1; if c m does not exist, f m takes a value of 0, and t m f m is the time-lapse eigenvalue of the mth time period.
  • Step 3 includes: calculating, according to the data obtained in step 2, the time stamp feature average value T end corresponding to the antennas at both ends by using the following formula:
  • T A represents the average value of the time stamp features at the A end
  • T B represents the average value of the time stamp features at the B end
  • Step 4 includes: if the average value of the timestamp feature of the RFID tag read by the A-end antenna is smaller than the average of the time-stamp feature of the RFID tag read by the B-end antenna, it is determined that the object carrying the RFID tag passes through A to B. If the average value of the timestamp feature of the RFID tag read by the A-end antenna is greater than the average of the time-stamp feature of the RFID tag read by the B-end antenna, it is determined that the object carrying the RFID tag passes from B to A. Access control.
  • the method further includes the step 5 of querying the mapping table of the label EPC number and the object carrying the RFID tag, and acquiring specific identity information (such as the name, job number, and the like) of the object carrying the RFID tag through the channel.
  • the invention utilizes the difference of the time period when the antennas at the two ends of the access control receive the reflected signal of the mobile tag, and detects the direction of the object carrying the RFID tag through the access control, thereby providing a convenient and efficient access control system.
  • the biggest feature of the present invention is that the RFID technology is used to perceive the movement behavior mode of the person. The system does not need the personnel to cooperate with the action of brushing the access card, and the entry prohibition can be determined after the person passes the access control.
  • the access control facilities do not need to be equipped with wing gates, which saves the time for the opening and closing of the traditional gated gates, and the personnel do not need to pass one by one, but can pass multiple people in a row, greatly improving the access of personnel through the door. effectiveness.
  • the access control system monitors the access situation of the personnel.
  • the personnel only need to carry the RFID tag containing the identity information with them, and the system can accurately discriminate and record the entry and exit behavior of the personnel without special operations.
  • the physical control of the traditional access control system for people can work well when multiple people pass continuously, optimizing the personnel experience of the access control system and greatly improving the efficiency of personnel passing the access control.
  • FIG. 1 is a block diagram showing the structure of an access control system of the present invention.
  • FIG. 2 is a schematic diagram of deployment of an embodiment.
  • Embodiment 3 is a flow chart of Embodiment 1.
  • 4 is a flow chart of an access control direction determination algorithm.
  • Fig. 5 is a schematic view of the second embodiment.
  • the invention discloses an open RFID access control system for access detection, characterized in that the access control system is installed on the side of the access passage, and includes at least one RFID reader, each of which is externally connected with two or more antennas; There is an antenna that is inclined toward the channel; at least one antenna is tilted toward the channel;
  • the antenna tilted toward the incoming channel first receives the RFID tag signal, and receives the RFID tag signal after the antenna tilted toward the outgoing channel;
  • the antenna tilted toward the direction of the channel first receives the RFID tag signal, and receives the RFID tag signal after the antenna tilted toward the channel;
  • the timing of receiving the same RFID tag signal through the antennas at both ends of the access control system confirms the direction of the RFID tag signal entering and exiting the channel.
  • the present invention includes two RFID readers, centered on the access channel, and symmetrically disposed on both sides of the channel.
  • the system further includes a background server, and the RFID reader feeds back the read RFID tag signal to the background server in real time through an external antenna, including an antenna port number, a label EPC number, and a time stamp of the received signal;
  • the background server calculates the difference between the average values of the time stamp features of the same RFID tag read by the antennas at both ends of the channel according to the tag signal returned by the RFID reader, and then identifies the mapping relationship between the tag EPC number and the identity information of the object carrying the RFID tag.
  • the antenna radiates electromagnetic waves outwardly, receives signals reflected by the RFID tags and transmits them to the RFID reader.
  • the background server further includes a display interface, and the display interface displays the access situation of the access control in real time according to the information collected by the RFID reader.
  • the invention also discloses a processing method for an open RFID access control system for access detection, comprising the following steps:
  • Step 1 Record the two ends of the access control system as the A end and the B end respectively, and use an RFID reader to read the RFID tag signal passing through the access control system;
  • Step 2 classify the reflected signals of the same tag received by the antennas on one side or both sides of the channel into one class, and sort them to obtain a sequence;
  • Step 3 Calculate the sequence obtained in step 2, and obtain an average value of the time stamp features of the same RFID tag read by the antennas at both ends of the channel;
  • Step 4 Determine, according to the average value of the time stamp feature, the entry and exit of the object carrying the RFID tag.
  • the RFID tag signal includes an antenna port number ant, a tag EPC number epc, and a timestamp t, and the above information is represented as a triplet ⁇ ant, epc, t ⁇ , indicating that the antenna port number of the RFID reader is ant.
  • the EPC number received by the antenna at time t is the label signal of epc.
  • Step 2 includes the following steps:
  • Step 2-1 The ternary group obtained in the step 1 is divided according to the antenna port number and the label EPC number, and the data including the same end antenna port number and the same label EPC number is divided into one class;
  • each type of data is sorted in order of timestamp t from small to large to obtain a tag signal sequence.
  • the corresponding total time is T; set a time period of size t d (generally 100 ms), divide the sequence into time segments, and divide the entire sequence into Segment
  • triples ⁇ ant,epc,t ⁇ in the mth time period they are combined into one feature triplet ⁇ end,epc,t m ⁇ , where end represents the position of the antenna in the access control system. , that is, the A end or the B end, the epc is the label EPC number, and t m is the middle time of the time period;
  • f m represents the state of the characteristic triplet in the mth time period. If c m is present, f m takes a value of 1; if c m does not exist, f m takes a value of 0, and t m f m is the time-lapse eigenvalue of the mth time period.
  • Step 3 includes: calculating, according to the data obtained in step 2, the time stamp feature average value T end corresponding to the antennas at both ends by using the following formula:
  • Step 4 includes: if the average value of the timestamp feature of the RFID tag read by the A-end antenna is smaller than the average of the time-stamp feature of the RFID tag read by the B-end antenna, it is determined that the object carrying the RFID tag passes through A to B. If the average value of the timestamp feature of the RFID tag read by the A-end antenna is greater than the average of the time-stamp feature of the RFID tag read by the B-end antenna, it is determined that the object carrying the RFID tag passes from B to A. Access control.
  • the method further includes the step 5 of querying the mapping table of the label EPC number and the object carrying the RFID tag, and acquiring specific identity information (such as the name, job number, and the like) of the object carrying the RFID tag through the channel.
  • the invention discloses an open RFID access control system for access detection.
  • the embodiment includes an access control left device, an access control right device 2, an RFID reader, a first antenna 3, and a second.
  • the antenna 4, the third antenna 5, the fourth antenna 6, the RFID tag 7, the first antenna and the third antenna are located at the access terminal A, and the second antenna and the fourth antenna are located at the access terminal B.
  • the access control system consists of two parts: the RFID signal acquisition device and the back-end server.
  • the RFID signal acquisition device is composed of an RFID reader and an antenna
  • the background server is divided into two parts: the access control direction determination algorithm and the display interface. The functions of each part are as follows:
  • RFID reader an external antenna that feeds back the read tag signal to the backend server in real time, including the antenna port number, tag EPC number, and timestamp of the received signal, and sends it to the background server.
  • Antenna Two antennas with a certain angle are arranged inside the device on one side or both sides of the access control channel, connected with the RFID reader, radiating electromagnetic waves outward, receiving the signal reflected by the RFID tag and transmitting it to the RFID reader.
  • the access control direction determination algorithm according to the tag signal returned by the RFID reader, calculates the difference between the average value of the time stamp features of the antennas at both ends of the access control and the same tag, and then combines the mapping relationship between the label EPC number and the object identity information carrying the RFID tag. Identify the object carrying the RFID tag through the access control and determine its access direction.
  • Display interface According to the information collected by the RFID device and the access control direction determination algorithm, the access control of the access control is displayed in real time.
  • This embodiment provides a processing method for an open RFID access control system for access detection.
  • the process is shown in FIG. 3, and the process is as follows:
  • Each object carries an RFID tag, and the identity of the object can be uniquely determined according to the EPC number of the tag.
  • Two antennas with a certain angle are deployed inside the equipment on one side or both sides of the access control channel.
  • two antennas with a certain angle are disposed inside the devices on both sides of the access control channel to enhance the robustness of the access control system.
  • the antenna is 60cm away from the ground, the center point distance of the two antennas in the device on the access side is 40cm, the antenna tilt angle ⁇ is 20°, and the reader power is 33.5dBm.
  • the top view is shown in Figure 2.
  • the RFID device continuously monitors the tag signal, including the antenna port number ant, the tag EPC number epc, and the time stamp t of the received signal.
  • n is set to 800 ms.
  • the access control direction determination algorithm is used to determine the behavior of the object carrying a tag to enter the ban, as shown in Figure 4, the specific process is as follows:
  • the tag signal of a tag during a listening process is classified according to the antenna port number.
  • the first antenna and the third antenna are located at the access terminal A
  • the second antenna and the fourth antenna are located at the access terminal B.
  • the tag signals read by the No. 1 antenna and the No. 3 antenna are classified into one class
  • the tag signals read by the No. 2 antenna and the No. 4 antenna are classified into one class, and the data in each class is time stamped from small to Sort in large order.
  • the classified data is divided into several time segments, and the characteristic triples of each time segment are calculated.
  • the classified data is divided into a plurality of segments in a time period of 100 ms.
  • the mth time period if there is tag signal data, they are combined into one feature triplet ⁇ side,epc,t m ⁇ , including the position end of the antenna in the access control system, the label EPC number epc, and the time period.
  • f m represents the state of the feature triplet in the mth time period. If c m is present, f m takes a value of 1. If c m does not exist, f m takes a value of 0. t m f m is the time stamp feature value of the mth time period.
  • the time stamp feature average value T end corresponding to the antennas at both ends is:
  • the object carrying the RFID tag passes the access control from A to B; If the average value of the timestamp feature of the RFID tag read by the A-end antenna is greater than the average of the time-stamp feature of the RFID tag read by the B-end antenna, it is determined that the object carrying the RFID tag passes the access control from B to A.
  • This embodiment describes the access control determination algorithm in conjunction with FIG. 4 and FIG. 5.
  • the circle pattern represents the label signal read by the A-end antenna
  • the triangle pattern represents the label signal read by the B-end antenna.
  • the total time T corresponding to the tag signal sequence is 590 ms.
  • the classified data is divided into 6 segments in a time period of 100 ms. For the A-end antenna, there are three-tuples in the first, second, third, fourth, and fifth segments, that is, the corresponding feature triplets exist in the first, second, third, fourth, and fifth segments.
  • the B-end antenna there are three-tuples in the second, third, fourth, and sixth segments, that is, the corresponding feature triplets exist in the second, third, fourth, and sixth segments.
  • a characteristic triplet c 1 ⁇ A, epc 1 , 50 ⁇
  • a characteristic triplet c 2 ⁇ B, Epc 1 , 150 ⁇ .
  • the present invention provides an open RFID access control system for access detection and a processing method thereof.
  • the above description is only a preferred embodiment of the present invention, and it should be noted that it is common to the technical field.
  • the skilled person will be able to make several modifications and refinements without departing from the principles of the invention, and such modifications and refinements are also considered to be within the scope of the invention.
  • the components that are not clear in this embodiment can be implemented by the prior art.

Abstract

L'invention concerne un système de protection d'entrée RFID de type ouvert destiné à la détection d'accès et son procédé de manipulation. Le système comprend principalement un lecteur RFID, une antenne, une étiquette et un serveur d'arrière-plan. Le procédé de fonctionnement de celui-ci consiste à : déployer respectivement deux antennes ayant un certain angle compris entre celles-ci à l'intérieur d'un dispositif sur les deux côtés d'un canal de protection d'entrée, les deux étant reliés au lecteur RFID, l'antenne recevant un signal réfléchi par une étiquette RFID portée par un objet accédant à la protection d'entrée, et les périodes de temps pendant lesquelles les antennes aux deux extrémités de la protection d'entrée reçoivent le signal réfléchi étant différentes, et à l'aide d'une telle caractéristique, déterminer et enregistrer et afficher les comportements d'entrée et de sortie du personnel dans le système de protection d'entrée en temps réel. La présente invention applique une technologie RFID à un système de protection d'entrée de type ouvert, qui peut reconnaître automatiquement des comportements d'entrée et de sortie lorsqu'une personne accède à la protection d'entrée, sans qu'il soit nécessaire d'agencer une porte d'aile ou une reconnaissance de type contact, ce qui permet d'améliorer considérablement l'efficacité de l'accès à la protection d'entrée du personnel.
PCT/CN2018/081261 2017-05-09 2018-03-30 Système de protection d'entrée rfid de type ouvert pour détection d'accès et son procédé de gestion WO2018205767A1 (fr)

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CN201710322222.9A CN107145919B (zh) 2017-05-09 2017-05-09 面向出入检测的开放式rfid门禁系统及其处理方法
CN201710322222.9 2017-05-09

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