Tangyuan Electronic's semi-active RFID prison personnel positioning system solution,RFID Animal Ear

　　Tangyuan Electronic's semi-active RFID prison personnel positioning system solution

　　However, most of the current situation of prison personnel management in my country is still at the stage of patrolling by prison guards and adding cameras to monitor and alarm. Manual operations still account for a large proportion, and the degree of information is relatively low, and information collection is still only relying on manual input. Really associate the information system with the detainees; it is impossible to grasp the location information of each person who is reformed in the prison in time; it is impossible to know in time whether anyone has left the area that should not be left; it is impossible to know in time whether anyone has entered the area that should not be entered Area; Is there any violation of regulations currently; it is not possible to check some important video materials in the first time and so on.

　　In response to the above problems, Shanghai Tangyuan Company developed a set of Tangyuan RFID intelligent positioning system using advanced Internet of Things technology. As my country's key development of strategic emerging industries, the Internet of Things, in addition to social applications, also has important applications and broad development prospects in the prison field.

　　In the new era and new stage, it has become a trend to change the prison's management mode of reform personnel and improve the level of prison informatization.

　　2, system introduction

　　RFID is a communication technology that can identify specific targets and read and write related data through radio signals without the need to establish mechanical or optical contact between the identification system and specific targets. Therefore, RFID is a non-contact automatic identification technology, which can quickly read and write, and long-term tracking management, so it is widely favored in the field of intelligent identification. At the same time, with the rapid development of the Internet of Things technology in my country, RFID technology, as the supporting technology of the Internet of Things, is considered to be one of the promising information technologies. In the next few years, more products will be implanted with RFID tags, and the application of RFID technology will be quite extensive.

　　Location service is a technology that is very popular and valued by people. At present, the well-known positioning service is GPS (Global Positioning System), as well as our country’s Beidou positioning system; and more and more other wireless network technologies have also begun to enter the field of positioning services, such as GSM mobile phone positioning, Wi-Fi positioning, RFID positioning, ZigBee positioning, Bluetooth positioning, etc. The widespread use of RFID technology in the Internet of Things has made RFID positioning a great advantage in indoor and other specific areas.

　　Tangyuan RFID intelligent positioning system is a regional positioning system that uses high frequency 2.4G and low frequency 125K RFID technology to automatically identify people and objects and regionally locate them, and realize the management of people and objects, such as : Personnel attendance, personnel and item search, area roll call of personnel and items, personnel statistics, video linkage, historical track query, key area management, etc.

　　3, system composition

　　Tangyuan RFID positioning system is mainly composed of two parts: positioning equipment and positioning system software.

　　3.1 Positioning equipment includes:

　　• RFID-2.4GHz positioning AP (also called reader)

　　There are two types of positioning APs: omnidirectional and positioning. The positioning AP is mainly responsible for receiving the signal sent by the tag, uploading it to the positioning server, and installing it in the positioning area.

　　• Location label

　　Location tags mainly send wireless signals to the location AP regularly. The location tags are divided into personnel location tags and article location tags. The tag has a built-in battery that can be replaced. Because the power consumption of the tag is low, a battery of the personnel tag can be used for more than one year under normal conditions. Personnel tags are available in wristband type and card type, and function buttons can be customized on the card type. It can be used for request and call or location report function.

　　• Handheld Reader

　　is also called a handheld terminal, which can receive the wireless signal sent by the positioning tag, and display simple information of the person wearing the tag on its own screen.

　　• Network equipment

　　• Computers and servers

　　• Positioning activator

　　As long as it is to improve positioning accuracy, assist AP positioning. Installed in the personnel activity area

　　3.2 Positioning system software

　　Tangyuan RFID intelligent positioning system adopts cloud computing technology. Through the design of cloud computing, a large amount of data processing can be completed by multiple servers, avoiding the computational pressure caused by processing all data by a single server. The positioning software consists of four Consisting of parts.

　　• System core program: Mainly responsible for data management and receiving data sent from the data collection terminal, and compare, query, and count the data sent from the collection terminal.

　　• Information collection program: It is mainly responsible for collecting the data of positioning tags and performing positioning calculations on the tags.

　　• Display terminal program: responsible for map display, personnel location display, alarm output, etc.

　　•Backstage management: Responsible for equipment management, association of personnel and items with tags, file management of personnel and items, location area management, and various query statistics, etc.

　　4, system function

　　4.1 Personnel monitoring

　　4.1.1 Real-time positioning of personnel area

　　can locate the area of the person wearing the location tag in real time, and display it on the map of the monitoring terminal

　　4.1.2 Regional personnel statistics and electronic roll call

　　Count the number of attendance and actual attendance in each area, as well as the actual attendance in a specific area, and compare it with the attendance to determine whether the attendance is complete. And display the name of the absent person.

　　4.1.3 Personnel search

　　In the monitoring terminal, you can enter the name or tag number to find the current location of the designated person.

　　4.1.4 Disappearing warning

　　can focus on monitoring certain tags, when these tags leave the designated area or disappear, the system will find the corresponding alarm

　　4.1.5 Crossing the boundary, leaving the alarm

　　Some areas are important areas, and an alarm message will be issued if unauthorized persons enter. It can also be set in some areas that certain personnel are not allowed to leave within a set time, if they leave or disappear, the system alarms.

　　4.1.6 Detention time has expired and warning

　　can set the stay time of personnel and objects in certain areas. When people or objects enter these areas, the system will alarm after a certain period of time.

　　4.1.7 Track playback

　　can query the movement track of a tag in a specified time period, and which areas the tag has been to during this time period.

　　4.1.8 Video linkage

　　You can bind a camera to each positioning device, and click the positioning device map on the map of the monitoring terminal to call the video of the area where the positioning device is located. When there is a specific alarm, the system will automatically call up the video of the area where the alarm occurred.

　　4.1.9 Temporary authorization of personnel

　　When a person needs to temporarily enter an important area or leave the itinerary area, a temporary authorization can be made in the system to allow him to enter an important area or leave the work area for a certain period of time.

　　For example, if the head of the prison asks for Zhang Tian to talk, the system can temporarily authorize Zhang San to enter the office of the director for 15 minutes or more.

　　4.1.10 Electronic label failure alarm

　　The failure of the electronic tag mainly refers to the low voltage of the tag battery; the wristband worn on the person's hand is damaged or removed;

　　As long as the wristband worn on the person's hand is taken off, the system will give an alarm; whether it is cut or removed with a tool, the system will give an alarm. The system will also prompt when the battery voltage of the label is too low, and the battery needs to be replaced as soon as possible.

　　4.1.11 Personnel ask for help

　　There are function buttons on the card-type positioning label. When a person is in danger or needs help in a situation, he only needs to press the function button. The system will display the location of the help and call out the nearby camera video.

　　4.1.12 Itinerary

　　Personnel schedules can be arranged in advance, such as: Zhang San must work in the workshop at 8:11 in the morning, in the cafeteria between 11:30 and 12, and in the cell from 7 in the evening to 7:30 the next day. If at 9 o'clock, Zhang San left the workshop without authorization and appeared in the cafeteria. The system will warn: Zhang San illegally left the workshop and entered the canteen.

　　4.2 Item monitoring

　　4.2.1 Item area positioning

　　Real-time monitoring of the location information of dangerous goods through electronic maps.

　　4.2.2 Item search

　　You can enter the name and number of the item on the monitoring terminal to find the location of the item

　　4.2.3 Item disappears alarm

　　When the monitored item disappears on the map, the system sends out an alarm that the item disappears.

　　4.2.4 Unauthorized alarm

　　The system will alarm if the item is unauthorized and leaves the designated area.

　　4.2.5 Alarm when the authorized time is exceeded

　　When authorized items exceed the time allowed for authorization to leave a certain domain, the system alarms.

　　4.2.6 Item label destruction alarm

　　If the label bound to the article is removed, the label will continuously send a removal alarm message to the system.

　　4.2.7 Low battery alarm

　　When the voltage of the battery in the label is low, the system will warn that the power of the specified label is insufficient, and the battery needs to be replaced as soon as possible.

　　5. System principle

　　RFID is a communication technology that can identify specific targets and read and write related data through radio signals. The positioning tag in this system is an active RFID electronic tag, and each tag has a unique number.

　　Positioning tags will actively send electromagnetic waves to the surroundings at regular intervals. The electromagnetic waves carry the tag number and other positioning information. Positioning APs placed around the tags will receive tags from time to time to send information through electromagnetic waves. Because each positioning AP is located at a different physical location, the received tag information will be different except for the same number. After the positioning AP receives the tag information, it uploads it to the positioning server collection terminal program. The positioning system calculates the location of the tag by calculating the slight difference in the tag positioning information received by each positioning AP. As shown below: There are two areas, A and B

　　Tangyuan Electronic's semi-active RFID prison personnel positioning system solution

　　In the above figure, tag 101 may be read by AP1 in area A and AP2 in area B at the same time, but AP1 has the strongest signal, so the tag is located in AP1, and AP1 is installed in area A, so the tag is located in area A Area. When the AP2 signal becomes the strongest at a certain time, the tag will be located in area B again. Conversely, when AP1 becomes the strongest again, the tag will be located in area A again.

　　Tangyuan Electronic's semi-active RFID prison personnel positioning system solution

　　Sometimes the signal is unstable due to external factors, causing the system to position the tag back and forth in each section, but the actual tag has not moved. In order to reduce this misjudgment, it is possible to install an access judgment activation device at the entrance and exit of the area. As shown below:

　　Tangyuan Electronic's semi-active RFID prison personnel positioning system solution

　　In the above figure, the label is located in area A first. When the signal in area B is the strongest, the label will not be located in area B. The system will first determine whether the label has passed through the dual area binder 3102, (also Whether the tag has passed the doorway to area B), if there is no system, the tag will not be located in area B, even if AP2 reads the signal of the tag stronger than AP1.

　　Because the system will first create a table of correspondence between tag numbers and personnel or item information at the beginning of its operation. After the location of the tag is determined, the core program starts to query the name of the area where the location is located, and uses the tag number to set the tag and personnel or item information. Query the correspondence table of items to identify the corresponding information of the tag; this realizes the regional positioning of people and items. Then the core program transmits these results to the display end program of the system via Ethernet; after the display end program receives the information, it will be on the computer screen.

　　6. Overall design of personnel positioning

　　6.1 Overview

　　Tangyuan personnel positioning system is mainly based on the area as the positioning unit. The positioning unit has no size regulation. It can be a small room or a large space, or it can be divided into multiple small units in a large single positioning unit.

　　In order to more accurately locate the person wearing the location tag, it is necessary to install a set of dual antenna activation equipment inside and outside all entrances and exits of each location area, which is used as a positioning judgment for entering the area and leaving and entering another area; and Install a certain number of positioning APs in the positioning area to cover the positioning signal; if each area is to be divided into special areas to prevent unauthorized personnel from approaching the area, only a set of dual-antenna activation equipment is needed, because the area The AP inside has already carried out positioning signal coverage.

　　The activation device adopts a dual-antenna activation method. In some complex areas, in areas that interfere with the activation signal, the double activation method can more effectively reduce false interruptions and improve the accuracy of regional judgment.

　　6.2 Positioning environment

　　This project involves a long area with a length of about 330 meters, a width of 3.5 meters and a height of 3.5 meters (as shown in the picture)

　　6.3 Positioning requirements

　　Real-time monitoring and management of the location of people entering the area is required, and the positioning accuracy is roughly within 5 meters.

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