Super RFID system based on sensor network 1 Introduction Radio frequency identification (Radio Frequency IdenTIficaTIon, RFID), also known as electronic tag (E-Tag), is a technology that uses radio frequency signals to automatically identify target objects and obtain relevant information. The sensor network-based super RFID system (hereinafter referred to as the super RFID system) combines the technical characteristics of RFID and sensor networks. It inherits the characteristics of RFID using radio frequency signals to automatically identify targets, and at the same time realizes the function of wireless sensor network active sensing and communication. Super RFID based on sensor networks is not a passive tagging technology, it can actively monitor the environment and record related data, and can actively send alerts when necessary. 2 RFID and wireless sensor network technology fusion 2.1 Introduction to sensor network technology Advances in micro-electromechanical systems (MEMS), wireless communications, and microelectronics technology have made it possible to design and develop low-cost, low-power, and multi-functional miniature sensors. These miniature sensors are small in size and have sensing, data processing and communication components. In the next few years, even ultra-low power SoCs will appear, integrating wireless communication, microprocessors and MEMS sensing and actuating components on a single chip. Many sensors (or actuators) with communication and computing capabilities are connected wirelessly, collaborate with each other, interact with the physical world, and work together to complete specific application tasks, called sensor networks. Compared with traditional sensors, the sensor network is easy to deploy, that is, the location of the sensor node does not need to be determined or carefully designed, allowing arbitrary placement, low deployment and maintenance costs, and high flexibility; the sensor network consists of a large number of inexpensive nodes, which can be placed Within the scope of the physical phenomenon, thereby obtaining higher observation accuracy and higher cost performance; the sensor network has a large number of redundant nodes, even if some nodes fail, it will not affect the function of the entire system, so it has better robustness The sensor network nodes have computing power, can cooperate with each other, and can complete tasks that traditional sensors cannot. 2.2 Technical integration of RFID and wireless sensor networks The combination of RFID technology and sensor network technology may be a development trend in the future. Sensor networks generally do not care about the location of nodes, so they generally do not use global identification for nodes, and RFID technology has a unique advantage in marking nodes. Combining the two together to form a network can make up for each other's defects. The main energy is concentrated on the data. When the information of a specific node needs to be specifically considered, the location of the node can be easily found by using the RFID identification function. 3 Composition of super RFID system The super RFID system adopts a hierarchical composition structure, which is divided into three levels: the terminal node and the gateway node and the upper-level user, as shown in Figure 1. Figure 1 Composition of Super RFID The tip node is composed of two parts, which are a large number of ordinary sensor nodes and super RFID tags. In addition to the basic RFID wireless tagging function, the super RFID node is also equipped with a micro sensor on the node, which can actively sense the temperature of the node marking object Humidity, location movement, smoke, electromagnetic environment, sound and other information, and can actively report perception information The intelligent processing node with a sensor device acts as a gateway node, and the gateway node has two functions: (1) read and aggregate the information of the super RFID node and the sensor node (2) analyze the read information and monitor in real time Environmental information. The active gateway node reads the information of the RFID tag when necessary, and sends it to the upper layer user through the sensor network; of course, the information of the RFID node can also be read by the handheld reader at any time. Upper-layer users mainly refer to external networks that directly communicate with smart gateway nodes, such as the Internet network or GSM network. In addition, the wireless sensor network and the existing wireless communication terminals (such as mobile phones) cannot communicate well. It is a good choice to use the existing network to send the processed information to the user terminal. 4 Architecture The super RFID system combines wireless sensor network and RFID technology, so when designing the system architecture, the characteristics of the two should be considered comprehensively. The system architecture is shown in Figure 2. Figure 2 System architecture diagram Savant software is a "middleware" that processes the flow of tag or sensor data (event data) obtained from one or more readers. It is a general enterprise data management architecture installed on a hierarchical, distributed server. The Savant of this system has three data sources, which can come from the reader in the traditional way, can receive the information of the sensor node, and can also receive the information sent by Super RFID. Based on Savant's hierarchical tree structure, and according to its classification, a unified hierarchical Savant system architecture is defined. According to the definition of the Auto-ID Standards Committee, Savant should include three required standard modules: event management system (EMS), real-time memory data structure (RIED) and task management system (TMS). Other optional standard program modules can be defined by users. Figure 3 is the architecture of Savant. Figure 3 Savant's architecture In Figure 3, the event management system application collects label interpretation events on Edge Savant (ES), it communicates with the reader application, and manages the event flow sent by the reader. The "Interpretation Adapter" and "Interpreter Interface" in the EMS architecture can be regarded as a common interface. For Edge Savant, the Interpretation Adapter communicates directly or indirectly with the Interpreter and collects events detected by the Interpreter , And then write these events to the reader interface. For Internal Savant, it is the parent node or superior of Edge savant s. IS collects EPC data from his subordinate Edge Savant, so "interpretation adapter" and "interpreter interface" can be regarded as general network data access interfaces . RIED is an in-memory database used to store Edge Savant information. Edge Savant saves and organizes events sent by the reader. The event management system (EMS) provides a framework for filtering and recording events, and the recorder can store the events in the database. When the database handles a large number of events, RIED provides the same interface as the database, but the real-time performance is better. Applications can access RIED through JDBC or a local Java interface. Savant software performs data management and data monitoring according to user-defined tasks. TMS is responsible for managing the tasks sent by superior Savant or enterprise applications to this level of Savant. Savant TMS makes the maintenance of distributed Savants simple. The tasks written to TMS can get all the attributes of Savant. 5 Conclusion This paper integrates RFID and wireless sensor network technology, proposes a super RFID system based on sensor network, introduces the composition and architecture of the system and the new requirements of the system for Savant. It is pointed out that the integration of RFID technology and sensor network fusion technology may be a new development trend. Office Power,Office Atx Power Supply,Office Mute Atx Power,Office Mute Power Boluo Xurong Electronics Co., Ltd. , https://www.greenleaf-pc.com
