JIU JIANG UNIVERSITY 中英文文献翻译题目RFID射频识别技术概述院系信息科学与技术学院专业计算机科学与技术姓名武晓杰班级学号A121238二Ｏ一五年十二月RFID basic principleWhat is the RFIDRFID is the abbreviation for Radio Frequency Identification, called electronics label . What is the RFID technologyRFID recognition is a non-contact automatic identification technology, rf signal through its automatic target recognition and access to relevant data, identify work without manual intervention, it can work in various environments. RFID technology can identify high-speed moving objects and can identify multiple tags, the operation is fast and convenient.Accenture laboratory's chief scientist sir alex ferguson feels RFID is a breakthrough technology: "first, can identify a very specific objects, rather like the code that can identify class objects; second, the use of rf, can read data through external materials, and bar code must rely on laser to read information; third, can also read on to multiple objects, and bar code can only read one by one. In addition, store of information is also very big."What is the basic component of RFIDThe most basic RFID system consists of three parts:·Tag:Tag consists of components and chips, each Tag has only electronic coding, adhere to the object for identifiering target;·Reader:read (sometimes also can write) label information equipment,it canbe designed for portable or fixed;·Antenna:Transmit radio frequency signals between in the label and reader.The basic principle of RFID technology is whatThe basic principle of RFID technology is not complex:Label into the field, Receive radio frequency signals from reader collision, with all the energy stored in a chip of the product information （passive tag, there is no source label or labels ）, Or actively tosend a frequency signals（active tag and to label or labels ）；to read information and understanding of the decoder after the central information systems to carry out the relevant data processing.What makes retailers so highly RFIDSanford Bernstein cristiano, according to analysts estimate the retailing company, by adopting the RFID, wal-mart can save $ billion each year, mostly because of the purchase of artificial view does not need to save the cost of labor code. Although some analysts think $8 billion in the digital too optimistic, but undoubtedly, RFID help solve the problem: the two biggest retail commodities and loss (broken by theft and supply chain was unsettled and loss of products),now a wal-mart, stealing a loss is almost 20 billion dollars, if a legitimate business turnover can achieve this number, can in American 1,000 enterprise's list of top first 694. Research organizations estimate, This rfid technology can help to reduce the level of 25% reduction and stock.The typical application of RFID technology is whatLogistics and supply managementManufacturing and assemblyAirline baggage handlingMail/express parcelA document tracking/library managementAnimal identity tagsMovementAccess control/electronic ticketsAutomatic charge. RoadRFID automatic recognition term explanation·micro wave: wavelength of centimeters or frequency in 1-100GHZ electromagnetic wave.·radiation frequency: usually microwave.·electronic tags: stored data object code identification tag, also calledrf CARDS.·passive tags: without power and internal by receiving microwave energy work.·active tags: by internal batteries work labels.·microwave antenna: used for launching and receive a signal.·read device: Used to read the labels in electronic data.·programming device:for electronic data written to the label or labels for the stored data.·beam bracketing: refers to the antenna beam range of microwave irradiation range launch power.·tag capacity: The label of programming can be written in the number of digits or logical.A - Biz -utomatic identification technology application case frameASN - senior freight noticeBIS - commercial information systemDA - shipment notificationEAN --European articles coding EPCTM - electronic productsONS - objects name resolution servicesPML - entity markup languageUCC - unity coding committeeUML - unified modeling languageSystem composition and working principleThe most basic RFID system consists of three parts:·Tag:Tag consists of components and chips, each Tag has only electronic coding, adhere to the object for identifiering target;·Reader:read (sometimes also can write) label information equipment,it canbe designed for portable or fixed;·Antenna:Transmit radio frequency signals between in the label and reader.Some systems have readers RS232 or RS485 interface with external computer (upper computer system) connection, and exchange data.The system of basic workflow is: reader through the antenna send certain frequencies of rf signals, when the rf card to enter the antenna working area induced current, rf cards gain energy to be activated, rf cards will own coding information through the card built-in transmitting antenna send out, System receiving aerial from rf card from the carrier signal, the antenna of a regulator to the reader, the reader to receive a signal and demodulates and decodes to the system to deal with the relevant ；the main system based on logic, determine the legality of smart cards, in different settings make the appropriate treatment and control signals control and direction of movement. in the coupling between inductors and electromagnetic way (), communication process (FDX, HDX, SEQ)、From rf card to the reader of data transmission of the load method (modulation, reverse scattering, high time harmonics) and frequency, from the contact method transmission a fundamental difference, but all the reader in principle, and the decision of the design structures are very similar. all the reader is a simple matter of high frequency and control unit two basic module. high frequency interface includes both transmitters and receivers, its functions include: to produce high-frequency transmit power to start and provide rf card energy. To launch signal used to send data to rf CARDS, Receive and demodulation of high frequency signals from rf CARDS. Different rfid system with some difference frequency interface design, the system frequency inductive coupling interface diagram shown.Readers of the control unit features include: communicate with the application software, Application software and to execute the order of radio frequencies ；control and communication from the principle of the lord - () ；signal of the decoding. to some specific systems are the collision, the algorithm to rf card reader, and to the transfer of data encryption and decryption, as well as on radio frequencies and the reader's authentication for an additional function.The rfid system is a key and distance of the parameters. At present, the price of long-distance rfid system is very expensive, thus to improve their reading for distance of the method is very important. Influence factors of distance and RF card reader, including antenna working frequency of RF output power, reader's reception sensitivity, RF card power, antenna and the resonant circuit Q value, antenna, RF card reader and the direction of the coupling, and RF card itself of energy and send information energy etc. Most of the system of writing is read and write different, read the distance is about 40% to 80%.Theory analysisRFID technology USES radio-frequency mode in the reader and rf card no contact between the bidirectional data transmission, in order to achieve target recognition and data exchange. And the tradition of code, magnetic and IC card, compared with non-contact, rf card reading speed, wear, not by environmental impact, long life, easy touse and has the characteristics of anti-collision function, can handle more CARDS. Abroad, rfid technology has been widely used in industrial automation, commercial automation, transportation control, etc.RFID基本原理什么是RFIDRFID是Radio Frequency Identification的缩写，即射频识别，俗称电子标签。