The core of the Internet of Things technology: RFID (1)
1. What is an RFID tag?
RFID radio frequency identification is a non-contact automatic identification technology. It automatically recognizes the target object and acquires relevant data through radio frequency signals. The identification work can work in various harsh environments without manual intervention. RFID technology can identify high-speed moving objects and recognize multiple electronic tags at the same time, which is quick and easy to operate.
What is an RFID tag?
Tag: consists of a coupling element and a chip. Each RFID tag has a unique electronic code attached to the object to identify the target object, commonly known as an electronic tag or a smart tag.
RFID electronic tags: active tags, passive tags, semi-active semi-passive tags.
RFID working principle: After the tag enters the magnetic field, it receives the RF signal from the reader, and sends the product information (passive tag, passive tag or passive tag) stored in the chip by the energy obtained by the induced current, or actively sends a certain Frequency signal (AcTIve Tag, active tag or active tag); the reader reads the information and decodes it, and sends it to the central information system for data processing.
Application of RFID Tag Technology Short-range RFID products are not afraid of harsh environments such as oil stains and dust pollution. Bar codes can be replaced in such environments, such as tracking objects on the assembly line of a factory.
Long-range RFID products are mostly used for transportation, and the recognition distance can reach several tens of meters, such as automatic charging or identification of vehicle identity.
1. In the retail industry, the use of bar code technology has enabled tens of thousands of commodity categories, prices, origins, batches, shelves, inventory, sales and other aspects to be managed in an orderly manner.
2. The vehicle automatic identification technology is adopted, which makes the toll gates such as roads and bridges and parking lots avoid the queuing phenomenon of vehicles, reducing the waste of time, thereby greatly improving the transportation efficiency and the traffic capacity of transportation facilities.
3. In the automated production line, all aspects of the entire production process are placed under strict monitoring and management.
4. In harsh environments such as dust, pollution, cold, and heat, the use of long-range RFID technology has improved the inconvenience of truck drivers having to get off the bus.
5. In the operation management of the bus, the automatic identification system accurately records the arrival time of the vehicles at each station along the line, providing real-time and reliable information for vehicle scheduling and full-time operation management.
The technical application of RFID electronic tags is very extensive. According to estimates by Chuangyi Technology Market Analyst, typical applications: animal wafers, access control, air package identification, document tracking management, parcel tracking identification, animal husbandry, logistics management, mobile commerce, products Anti-counterfeiting, sports timing, ticket management, car chip anti-theft device, parking lot control, production line automation, material management, etc.
Research on RFID open source projects:
Open source software radio technology has a strong impact on the radio industry, and RFID is no exception. GNU Radio is a free software development kit. It provides a signal operation and processing module that enables software-defined radios on low-cost radio frequency (RF) hardware and general-purpose microprocessors that are easy to fabricate. This suite is widely used by amateurs, academic institutions and commercial organizations to research and build wireless communication systems. The application of GNU Radio is mainly written in the Python programming language. But its core signal processing module is built on C++ with a floating-point microprocessor. Therefore, developers can quickly and easily build a real-time, high-capacity wireless communication system. Although its primary function is not an emulator, GNU Radio supports the study of algorithms for signal processing of pre-stored and (signal generator) generated data without RF RF hardware components.
In the 20th century, the theoretical and applied research of radio technology was one of the most important achievements in the development of science and technology. Harry in 1948. Stokeman's "Communication with Reflected Power" laid the theoretical foundation for RFID. After decades of development, RFID technology theory is becoming more mature and the product variety is becoming more and more abundant.
Conceptually, RFID (Radio Frequency IdenTIficaTION) is a non-contact automatic identification technology that automatically identifies target objects and acquires relevant data information through RF signals. Non-contact two-way communication using radio frequency to achieve identification purposes and exchange data. RFID technology can recognize high-speed moving objects and recognize multiple labels at the same time, which is quick and easy to operate.
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