Radio Frequency Identification (RFID) is a wireless communication technology that uses radio signals to identify specific targets and read and write related data without the need to identify mechanical or optical contact between the system and a particular target. The radio's signal is transmitted from the tag attached to the item by an electromagnetic field that is modulated into a radio frequency to automatically identify and track the item. Some tags receive energy from the electromagnetic field emitted by the recognizer when they are recognized, and do not require a battery. The tag itself has a power source and can actively emit radio waves (electromagnetic fields that are modulated into radio frequencies). The tag contains electronically stored information that can be identified within a few meters. Unlike barcodes, RF tags do not need to be within the line of sight of the recognizer, but can also be embedded within the object being tracked.
Radio frequency identification technology is used in many industries. Attaching the label to a car that is in production, the factory can easily track the progress of the car on the production line. The warehouse can track where the medicine is located. RF tags can also be attached to livestock and pets to facilitate positive identification of livestock and pets (positive identification means preventing several animals from using the same identity). The RFID-enabled identification card allows employees to access the locked building section, and the RF transponder on the car can also be used to collect the toll road and parking lot.
Some RF tags are attached to clothing, personal belongings, and even implanted in the human body. Because this technology may read personal information without my permission, this technology may also infringe on personal privacy concerns.
Microwave Radio Frequency Identification (UHF RFID) technology is the most advanced fourth-generation automatic identification technology in the world. It is a new technology that has just begun to emerge in recent years and has been rapidly promoted and applied. It has a long recognition distance and high recognition accuracy. It has the characteristics of fast recognition speed, strong anti-interference ability, long service life, penetrating non-metallic materials, and wide application range. It is a new management method introduced for the automatic collection of feature data such as attributes, status and number of objects for digitization and informationization. It can be widely used for automatic identification of people, animals and articles.
UHF RFID mainly has three components: radio frequency identification card, reader/writer and microwave antenna:
(1) Radio frequency identification card: also known as electronic tag is mainly used to store the data information of the tagged object:
The core of the RFID card is an integrated circuit with information transceiving and storage functions, with a storage capacity of 1024 bits or more. The device is visually referred to as an "electronic tag" because it is pasted on the identified object like a normal tag. The RFID card stores information such as the attributes, status, and number of an object. Electronic tags are usually mounted on the surface of the object with a certain angle of view without metal occlusion.
A typical RFID card pattern is as follows:
(2) Reader : It is used to read or write the data in the RFID card. It satisfies the need for simultaneous fast and accurate automatic identification of multiple objects or people moving fast. It is suitable for reading distances far. The application field is fast in recognition and requires identification of multiple cards at the same time. Its main functions are:
1. Write the data information to be stored to the blank RFID card;
2. Read all kinds of data information currently stored in the RFID card;
3. Modify (rewrite) the data information in the RFID card.
(3) Microwave antenna : It is connected to the reader, mainly to send and receive related data signals to the RFID card.
The working frequency band of microwave radio frequency automatic identification technology is divided into three types: 915MHZ, 2450MHZ, and 5800MHZ. It has the following outstanding advantages compared with the low frequency automatic identification (ie, the popular IC card in the market, its working frequency band is 125kHz, 13.5MHz):
(1) Ultra-thin soft film base layer, light, thin, compact, suitable for a variety of package forms, with strong self-adhesive tape;
(2) Passive type, maintenance-free, service life of more than 10 years, repeated erasing more than 100,000 times, cost-effective, good consistency, suitable for large-scale use.
(3) Reading distance is far (up to 10m or more);
(4) The card reading speed is fast (ms level), which is millisecond level. Each time you read 32bits "2ms, you can recognize high-speed moving objects (such as cars);
(5) It can be read through non-metallic media such as glass, cloth, wood, plastic, etc. It can also work in harsh environments such as oil stains and dust;
(6) Good directionality, directional reading, support multiple readers to work in the same small area, do not interfere with each other;
(7) Adopt anti-collision communication protocol, effective binary tree anti-collision mechanism, and can read more than 50 identification cards per second;
(8) It can work around the clock, free from wind, rain, snow, fog and other weather, not affected by temperature, no need for lighting.
(9) Ultra-wide working frequency band design, suitable for frequency hopping working mode, with superior anti-interference ability, not only meets relevant industry regulations, but also can be flexibly developed and applied.
(10) Users can customize the reading and writing standards and data to make the application system more efficient.
(11) The storage capacity is 1024bits, the world's only 64bits ID number, 928bits storage area for reading and writing operations;
Uhf rfid works:When an object with an electronic tag approaches the reader within a range of 0 to 10 meters, the reader is controlled to emit a microwave inquiry signal, and the electronic tag mounted on the surface of the object receives the inquiry signal of the reader, and then The signal is integrated with the data information in the tag and reflected back to the electronic tag reading device. The reflected microwave synthesized signal has carried the electronic tag data information. After receiving the microwave synthesis signal reflected back by the electronic tag, the reader/writer can separate and read the identification code and other information stored in the electronic tag after being processed by the internal microprocessor of the reader/writer.
Uhf rfid technology applicationFirst, vehicle management highway (road and bridge) non-stop charging management license plate anti-counterfeiting identification management bus electronic station sign and intelligent management vehicle group scheduling management intelligent parking lot management truck scale vehicle automatic copy number identification management vehicle fixed point identification / monitoring / assessment management vehicle In and out of the management vehicle traffic statistics management port entry and exit vehicles inspection management illegal vehicles and driver's license inspection management vehicle fees inspection management oil station "self-service" management traffic police patrol attendance management
Second, personnel in and out of the management campus card and home school management personnel in and out of the automatic identification management sentinel (gun) off-site alarm security patrol, patrol management meeting sign-on identification candidate / admission ticket identification management prison in and out identification management unit attendance management factory mine Enterprise access control hospital hospital patient access identification
3. Coal mine informationization and automation management Coal mine underground personnel tracking and identification management Coal mine main road mine car management Coal mine pits and pounds station car automatic weighing and car automatic copy number identification management miner's lamp management production statistics management outbound vehicle automatic weighing identification management
Fourth, logistics management warehouse materials import and export supervision and identification management valuables security baggage parcel identification management terminal container management material flow control and identification management material supervision and statistical management
V. Other aspects Management Production Statistics Management Production Process Fixed Point Identification Management Asset Tracking Identification Management Product Core Component Tracking Identification Management Product Core Component Lifecycle Management
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