RFID (Radio Frequency Identification) 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. RFID is a flexible application technology that is easy to handle, simple and practical, and especially suitable for automated control.
Advantages of RFID technology
1. Quick scan. For barcodes, only one barcode can be scanned at a time. RFID uses a non-contact method, which has no directional requirements. Once the label enters the magnetic field, the reader can read the information in real time, usually in a few milliseconds. The anti-collision mechanism enables multiple tags to be processed at the same time, enabling batch identification, up to 50/s at the same time, and recognition in motion.
2. The size is small and the shape is diversified. RFID is not limited in size and shape on reading, and it does not need to match the fixed size and print quality of the paper for reading accuracy. In addition, RFID tags can be developed into smaller and more diverse forms for use in different products.
3. Anti-pollution ability and durability. Traditional bar code carriers are paper and are therefore susceptible to contamination, but RFID is highly resistant to substances such as water, oil and chemicals. In addition, since the bar code is attached to a plastic bag or an outer carton, it is particularly susceptible to breakage; the RFID tag is to store data in the chip and thus be protected from fouling.
4, can be reused. Nowadays, barcode printing cannot be changed after it is printed. RFID tags can repeatedly add, modify, and delete data stored in RFID tags to facilitate information update.
5. Penetration and barrier-free reading. In the case of being covered, RFID can penetrate non-metallic or non-transparent materials such as paper, wood and plastic, and can communicate transparently. The barcode scanner must be able to read the barcode at close range without object blocking.
6, the data has a large memory capacity. The capacity of the one-dimensional barcode is 50B, the maximum capacity of the two-dimensional barcode can be stored from 2 to 3000B, and the maximum capacity of the RFID is more than 294. With the development of memory carriers, the data capacity has also been expanding. The amount of information that will be carried in future items will increase, and the demand for capacity expansion of the volume label will increase accordingly.
7, security. RFID is solidified in the chip according to the internationally unified electronic product code encoding system. It does not repeat the 40-digit unique identification internal code and cannot be copied and changed. Data can be encrypted, sectors can be locked once and locked, and important information can be locked based on the user. This technology is difficult to be counterfeited and invaded, making domestic chips more secure.
Problems to be solved in the RFID system
1. Selection of RFID coding standards. There is currently no uniform standard for electronic tags (RFID) in the world. In terms of standard setting in China, the National Standards Committee has jointly conducted research on RFID standards in China with 14 units including the Ministry of Science and Technology, the Ministry of Information Industry and the Shanghai Institute of Standardization. Currently, the draft of RFID standards for animals has been completed and is The "General Technical Specification for Animal Electronic Labeling" was introduced, but the specification is still only preliminary, and it is still being improved, and it is still difficult to promote it nationwide in a short period of time. The RFID standards for other types of agricultural products other than animal husbandry remain to be studied.
2. Information security issues of RFID. The data security issue of RFID is also a compelling topic. Since some data is stored in the electronic tag, privacy protection has become a very important issue, even a key point affecting the future of commercial applications. Since the reading of the electronic tag data is triggered by the reader transmitting the radio frequency, that is, as long as the reader transmits the same frequency, the transponder will react the same and transmit the same data, which will give The lawless elements create opportunities.
In order to solve the above problem, it is necessary to limit the reading of the ID. At present, the most successful method is to use encryption to embed the real-time monitoring data into the database by embedding the encryption in the electronic tag. If some system parameters work in an abnormal state, you must give a warning message in the interface and regulate the monitoring system. In order to make the user easy to observe and intuitively understand, the collected data needs to be converted into an intuitive and user-friendly form, that is, the data is represented in the form of a graph. The GUI in VC can easily support the implementation in graphical form.
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