上海交通大学自动化系 Research Report on RFID 武文汉5090309281 RFID is short for the Radio Frequency Identification which has been widely used to build the Internet of Things,for example,ID for books in library,tracking sources of food and so on. During the National Day Holiday,I have done some research on the working principle of RFID. In the advanced Supply Chain system,RFID system adapts the radio waves to scan and record the data received from RFID tags.The RFID can be placed up a few meters away from RFID tagged objects,which is the mainly advantage compared with the normal electrical tags.Its working principle is that the tagged objects can be identified by the aeromagnetic coupling radio frequency signals.In the RFID system,there are always RFID Readers which can be fixed or moved,Data-carryings which are mainly electromagnet coil and chips storing the ID data.The frequency radio usually transmitted by the reader and can be divided into low-frequency(30~300 kHz),mid-frequency (3~30MHZ),high-frequency (300MHz~3GHz)and microwave (2.45GHz and the higher).There are some applied examples,125kHz for identifying dogs and managing access of a building,13.56MHz for identifying the goods on the shelves,915MHz for managing the traffic and the 2.45GHz for building a distribute wireless network. In the tags,there is a logic and physical storage which contains the ID information.When the antenna received the radio signals,the coils oscillate to power the storage to work.The C/R Agreement is the bridge between the reader and tags.The reader is something like embedded device contains chips,storages,timer,coders,decoders and bus,mainly can be included into physical reader and data agreement processor.At the top of the RFID system,the system software receives,processes and transmitted all the information. There are two ways for signal coupling,one is inductively coupling which is like transformer model and the law of electromagnetic induction based on low-frequency or high-frequency, The reader transmits the The transponder generates induction The transponder transmits frequency radio by antenna current and become activated the ID data by antenna The reader transmits the The reader demodulates The antenna of reader correct information to the and decodes the signal receives the carrier signal
上海交通大学自动化系 1 Research Report on RFID 武文汉 5090309281 RFID is short for the Radio Frequency Identification which has been widely used to build the Internet of Things, for example, ID for books in library, tracking sources of food and so on. During the National Day Holiday, I have done some research on the working principle of RFID. In the advanced Supply Chain system, RFID system adapts the radio waves to scan and record the data received from RFID tags. The RFID can be placed up a few meters away from RFID tagged objects, which is the mainly advantage compared with the normal electrical tags. Its working principle is that the tagged objects can be identified by the aeromagnetic coupling radio frequency signals. In the RFID system, there are always RFID Readers which can be fixed or moved, Data-carryings which are mainly electromagnet coil and chips storing the ID data. The frequency radio usually transmitted by the reader and can be divided into low-frequency (30~300 kHz), mid-frequency (3~30MHz), high-frequency (300MHz~3GHz) and microwave (2.45GHz and the higher). There are some applied examples, 125kHz for identifying dogs and managing access of a building, 13.56MHz for identifying the goods on the shelves, 915MHz for managing the traffic and the 2.45GHz for building a distribute wireless network. In the tags, there is a logic and physical storage which contains the ID information. When the antenna received the radio signals, the coils oscillate to power the storage to work. The C/R Agreement is the bridge between the reader and tags. The reader is something like embedded device contains chips, storages, timer, coders, decoders and bus, mainly can be included into physical reader and data agreement processor. At the top of the RFID system, the system software receives , processes and transmitted all the information. There are two ways for signal coupling, one is inductively coupling which is like transformer model and the law of electromagnetic induction based on low-frequency or high-frequency, The reader transmits the frequency radio by antenna The transponder generates induction current and become activated The reader demodulates and decodes the signal The reader transmits the correct information to the server The transponder transmits the ID data by antenna The antenna of reader receives the carrier signal
上海交通大学自动化系 another is electromagnetic backscatter coupling which is like radar based on super-frequency or microwave.The identifying process: RFID system work is divided into full-duplex (Full Duplex)and half-duplex (Half Duplex) system as well as the timing(SEQ)system.Full duplex RF tag reader to transfer information to each other at the same time.Half-duplex two-way transmission of information between the RF tag readers,but at the same time can only send information in one direction.In full-duplex and half-duplex systems,the response of the RF label is sent in the case of the electromagnetic field emitted by the reader or the electromagnetic wave.As compared with the signal of the reader itself, the RF label signal in the receiver antenna is weak,so must use the appropriate transmission method,so that the RF signal and the reader's signal label to distinguish.In practice,people generally use the data transfer from the RF tag reader the load reflection modulation technology RF label data is loaded into the reflection echo(especially for passive RF label system). The order of working can be divided into Reader Talk First(RTF)and Tag Talk First(TTF), and many tags can be read in the same time.The data encoding can be Non Return to Zero, Manchester,Unipolar RZ,DBP,Miller,Pulse Width Modulation,and Pulse Position Modulation and so on. In simple terms,RFID works:tag enters the magnetic field,received a special radio frequency signal emitted by the reader,will be able to be sent obtained by virtue of the induced current energy stored in the chip in the product information(i.e.Passive Tag-free source tag or passive tags),or take the initiative to send a signal frequency (i.e.active Tag,active tags or active tags)reader to read and decode the information sent to the central information system data processing. In the summer internship,we have developed a three-dimensional garage model.Garage parking spaces and vehicle identification,we tried a variety of sensors.Eventually we chose RFID as a vehicle-mounted sensor.When the car moved into a parking garage comes with circular scan reader will read out the label information,and the information was fed back to a central processing system,to achieve real-time identification and allocation of parking spaces.This is an application of RFID for intelligent transport experiments.RFID will help humans achieve a more intelligent Earth However,in my opinion,RFID will be other sensors replaced.The information storage
上海交通大学自动化系 2 another is electromagnetic backscatter coupling which is like radar based on super-frequency or microwave. The identifying process: RFID system work is divided into full-duplex (Full Duplex) and half-duplex (Half Duplex) system as well as the timing (SEQ) system. Full duplex RF tag reader to transfer information to each other at the same time. Half-duplex two-way transmission of information between the RF tag readers, but at the same time can only send information in one direction. In full-duplex and half-duplex systems, the response of the RF label is sent in the case of the electromagnetic field emitted by the reader or the electromagnetic wave. As compared with the signal of the reader itself, the RF label signal in the receiver antenna is weak, so must use the appropriate transmission method, so that the RF signal and the reader's signal label to distinguish. In practice, people generally use the data transfer from the RF tag reader the load reflection modulation technology RF label data is loaded into the reflection echo (especially for passive RF label system). The order of working can be divided into Reader Talk First (RTF) and Tag Talk First (TTF), and many tags can be read in the same time. The data encoding can be Non Return to Zero, Manchester, Unipolar RZ, DBP, Miller, Pulse Width Modulation, and Pulse Position Modulation and so on. In simple terms, RFID works: tag enters the magnetic field, received a special radio frequency signal emitted by the reader, will be able to be sent obtained by virtue of the induced current energy stored in the chip in the product information (i.e. Passive Tag-free source tag or passive tags), or take the initiative to send a signal frequency (i.e. active Tag, active tags or active tags) reader to read and decode the information sent to the central information system data processing. In the summer internship, we have developed a three-dimensional garage model. Garage parking spaces and vehicle identification, we tried a variety of sensors. Eventually we chose RFID as a vehicle-mounted sensor. When the car moved into a parking garage comes with circular scan reader will read out the label information, and the information was fed back to a central processing system, to achieve real-time identification and allocation of parking spaces. This is an application of RFID for intelligent transport experiments. RFID will help humans achieve a more intelligent Earth.However, in my opinion, RFID will be other sensors replaced. The information storage
上海交通大学自动化系 capacity is not large enough,the cost is relatively high,the standards are not unified,privacy issues,and the impact on health and other factors will limit the development of RFID.In addition, the low-frequency and high-frequency RFID can only be read to identify one by one,cannot read group.This has seriously affected the efficiency.But the RFID technology continuing to mature will be for things networking to inject fresh vitality.RFID will still be the future for years,or even decades of hot research object
上海交通大学自动化系 3 capacity is not large enough, the cost is relatively high, the standards are not unified, privacy issues, and the impact on health and other factors will limit the development of RFID. In addition, the low-frequency and high-frequency RFID can only be read to identify one by one, cannot read group. This has seriously affected the efficiency. But the RFID technology continuing to mature will be for things networking to inject fresh vitality. RFID will still be the future for years, or even decades of hot research object
