RFID Beacon Location Solutions,nfc fpc tag

　　RFID Beacon Location Solutions

　　1. Composition of beacon positioning system

　　The beacon positioning system consists of RFID electronic tags, RFID long-distance readers, RFID beacons and positioning servers. The system architecture diagram is as follows:

　　Description: The locator uses RFID wireless beacons to replace the RFID reader. The RFID beacon integrates the RFID tag reader and data relay function, which is used to receive 2.4G active RFID tag information and send it to the 433M beacon wirelessly through 433M. The reader locates the base station. The positioning base station sends data to the background positioning server through wireless wifi or Ethernet. The receiving frequency band is 2.4G, the communication distance with the tag is 50 meters to 90 meters, the sending frequency band is 433M, and the communication distance with the positioning base station is 200 meters.

　　2. Realization of beacon positioning system

　　The RFID beacon positioning system of Shanghai Netfrequency Electronic Technology Co., Ltd. has introduced foreign wifi indoor positioning technology, and the background positioning server integrates indoor positioning algorithms such as nearest neighbor positioning method, multilateral positioning method, triangular positioning method, fingerprint positioning method, and path trajectory method. The front-end uses active RFID electronic tags with lower cost and lower power consumption. The RFID positioning beacon receives 2.4G active RFID electronic tags and sends them to the 433M RFID beacon reader and writer to locate the base station through the 433M frequency. The implementation of the project is more convenient, it is easier to maintain, and the cost is lower, and the positioning accuracy is higher. The core of the Wifi-rfid indoor positioning system is the positioning server software integrated with the signal strength triangulation core algorithm. The positioning server is a server running program, which is mainly used for communication with tags, including receiving and sending instructions and calculation of real-time positioning of tags. At the same time, it provides standard API interfaces for secondary development by third parties. The positioning server is the cornerstone of the operation of the entire real-time positioning system. The positioning server provides a core positioning algorithm based on signal strength RSSI, combined with signal strength binding and signal strength fingerprint sampling, to give rfid tag location information, with a positioning accuracy of 3 to 5 meters.

　　It should be pointed out that the positioning engine is essentially a positioning algorithm. Our company adopts RSSI signal strength positioning, core triangulation positioning algorithm, special interference processing algorithm, and can be combined with fingerprint identification sampling algorithm. The positioning server software can be used for WIFI personnel positioning, RFID personnel positioning, Zigbee personnel positioning, Bluetooth personnel positioning, etc. That is to say, the physical transport layer can adopt different schemes. As long as the locator, the MAC address or ID number of the located object, and the obtained signal strength value are transmitted to the server, real-time positioning can be achieved.

　　The main functions of the positioning server:

　　1) Real-time communication with the tag: After the positioning server receives the instruction content of the control tag sent from the tag manager and the positioning monitor, it converts it into a data packet that can be recognized by the tag, and sends it to the tag to realize the function of controlling the tag. Receive the data sent by the tag, receive the wireless signal data sent by the tag, and information such as temperature. After analysis, save to the system.

　　2) Calculate the location of the tag: According to the stored wireless signal data of the tag, analyze the coordinate point of the location of the tag, save it in the system, and display it through the electronic map.

　　3) Standard API interface for secondary development: a standard API interface for secondary development that is opened for other applications to call the function of the location server. Through the API, the location server can be easily integrated into other applications. It is convenient to realize system expansion and system integration. The API can be used to set tag parameters, collect tag data, tag position information, and tag alarm information.

　　Positioning monitor: Positioning monitor is a positioning management platform based on WEB mode, without installing any client software, it is simple to deploy and easy to operate. The positioning monitor integrates monitoring, query, and collection of positioning information. Combined with the actual map, it displays the location of the tag in real time on the map, the historical trajectory of the movement, and can also determine whether the tag has disappeared and whether the corresponding warning has been triggered. After personnel and assets wear or bind tags, the positioning monitor can automatically monitor the real-time location of assets or personnel, and conduct real-time positioning management of personnel and assets intuitively and visually.

　　The main functions of the positioning monitor:

　　1) User management: Display the information of all users, set and manage the basic information of users.

　　2) Real-time positioning: The first self-developed and original positioning algorithm in China, the real-time position of the precise positioning tag can reach 3-5 meters.

　　3) Area alarm: The server can set the alarm area. When the label enters or leaves the alarm setting area, the server area alarm function will be triggered.

　　4) Immediate alarm: The tag will actively send an alarm signal to the server, and the server interface will display the alarm information immediately.

　　5) Disappearance alarm: When the tag is powered off or the tag goes out of the wireless network coverage area, the server alarm will be triggered.

　　6) Historical track analysis: The server can play back the running track of the tag and analyze the historical location information of the tag.

　　7) Wireless sensing: By setting the series of temperature, humidity, gas density, pressure, vibration, etc., exceeding the series will trigger the wireless sensor control function of the server.

　　8) Map management: According to the operation status of the label, the electronic map of the location of the label can be automatically switched.

　　3. WIFI-RFID beacon positioning system description

　　1) Description of positioning accuracy

　　System positioning accuracy: depends on the positioning algorithm and locator deployment, usually the positioning accuracy is 3 to 5 meters. If higher positioning accuracy is required, more locator nodes need to be deployed. The positioning accuracy is related to the deployment of base stations and wireless beacons. If you want an accuracy of 5 meters, it is best to deploy a base station or beacon every 10 meters. In the case of low requirements, the number of locators can be appropriately reduced, and fingerprint sampling of the environment can be used. What needs to be specially mentioned is that the positioning accuracy has nothing to do with wifi transmission, Zigbee transmission, RFID transmission, etc. The positioning accuracy depends on the core algorithm of the positioning server and the deployment of the locator.

　　2) Locator deployment

　　Locator deployment needs to be combined according to customer positioning requirements and the actual site. If you want an accuracy of 5 meters, it is recommended to deploy a locator every 10 meters. The locator can be a base station or a wireless beacon. Fingerprint identification can be used for positioning, and RSSI signal strength can be sampled at different locations. The advantage of sampling can improve the positioning accuracy, but the disadvantage is that the amount of engineering is large, the sampling value and the actual value are often inconsistent, and it is greatly affected by the environment. The environment has changed and needs to be resampled. In addition, the orientation of people and objects will affect the positioning effect during sampling, so it is easy to drift. Places with little impact on the environment can improve the positioning accuracy through sampling.

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