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The technological advancement of radio frequency products has unparalleled advantages in the field of storage, so radio frequency identification technology RFID (English full name RADIO FREQUENCY IDENTIFICATION) has been rapidly popularized and promoted in the fields of commerce, material circulation, and production enterprises.
Radio frequency identification technology uses radio and communication technology to read and write recording media under the action of electromagnetic fields. The recognition distance can reach 1.2 meters, and it has a much larger data storage capacity than barcodes, up to 16Kbit. At the same time, it has extremely high confidentiality. In application, it will not be affected by pollution, humidity, light coverage, orientation and location, and it has strong adaptability. Radio frequency identification technology has been widely used abroad, especially in occasions where data content needs frequent changes and tracking information applications are more extensive, such as: large-scale commercial distribution centers, warehouse management, highway toll collection systems, electronic public transportation tickets, etc. Good economic benefits.
The radio frequency identification system consists of two main parts: electronic tags and readers, as shown below:
data transmission
RFID Reader Antenna Control Timing Antenna Electronic Tag
Computer control system, energy supply
1. Electronic label:
Fixed on the object to be identified, it is divided into active electronic tags and passive electronic tags. The active type has its own power supply, which has high reliability and long signal transmission distance. The passive electronic tag itself has no power source and is in a passive range state outside the working range. Only when it enters the working area, the electronic tag is active, and its response distance is significantly lower than that of the active electronic tag. Passive electronic tags are generally made in the form of cards, while active electronic tags are mostly made in the form of discs and strips. It adopts readable and writable electronic tags. In addition to the characteristics of read-only electronic tags, a piece of erasable read-only memory (EEPROM) is installed inside, and the electronic tags can be modified if conditions are met and permitted. And supplement, and the electronic label itself has the function of “mobile database”.
2. Reader:
It consists of two parts, namely the control part and the transmitting and receiving part. The composition structure is as follows:
Computer Control System Control Unit Antenna Transmitting and Receiving Port Antenna
The function of the transmitting and receiving part is:
(1) Provide energy to the electronic tag to start the electronic tag work.
(2) Modulate the information signal to be transmitted in order to transmit the data to the electronic tag.
(3) Receive the signal reflected from the electronic tag, demodulate it and send it to the controller. The transmission and reception of the signal are carried out through the antenna, so there are strict requirements on the shape and placement of the antenna.
The role of the control part is:
(1) Through transmitting and receiving signals, to coordinate the work of the entire system.
(2) Perform error check on the received data. Multiple types of check methods (such as parity check, cyclic redundancy check, etc.) can be used.
(3) Establish a control and data channel with the computer control system.
RF application program in the field of logistics transportation and warehousing
Modern commercial warehouses are constantly developing in the direction of large-scale and intelligent, and the management of warehouses is becoming more and more complicated. The traditional management method of inspection and release can no longer meet the requirements of enterprise managers and vehicle users. Therefore, some new and highly intelligent management technology models continue to appear, making the management of storage and transportation vehicles more flexible, convenient and safer.
Cargo management. The core of the traditional warehouse management method is a computer, but the input of commodity information still relies on manual processing. The result is: not only increases the workload, but also reduces the accuracy of the data. When using a long-distance radio frequency identification system, a certain number of signal transmitting and receiving devices can be installed in the warehouse area of the cargo warehouse, so that the entire warehouse area is covered under a complete control network. When goods carrying radio frequency tags (usually large and important goods) enter the radio frequency work area, the radio frequency tags are activated, and all the data on the labels such as: manufacturer, name of the goods, quantity, batch number, delivery address and destination address, etc. , Are transmitted through the transmitting antenna on the tag. The receiving antenna of the system receives this signal and transmits it to the reader through the transmission line. After being decoded and verified by the reader, it is input into the computer. All the information of this product is completely and accurately recorded by the database in the computer. As long as the goods do not leave the warehouse area but only move within the warehouse area, all the information about the goods can be monitored by the computer, such as the location of the goods in the warehouse area, when they entered the warehouse area, and when they were transferred out of the warehouse area. And so on, the computer has accurate records. This system is more convenient, accurate, fast and flexible than traditional bar code management methods, and it also greatly improves the safety of goods.
(1) It can accurately identify whether the incoming and outgoing goods are in the system or out of the system. If it is the goods in the system, there is no need to check; and the goods outside the system need to be registered before they can enter the warehouse area.
(2) The computer can accurately grasp that the goods inside the system are in the warehouse area and are still outside the warehouse area. How much cargo is still in the warehouse, which is convenient for central dispatch.
(3) The computer can accurately record the time of goods entering and leaving the warehouse in the system.
(4) By setting up different levels of identification tags to authorize the use level of vehicles, some vehicles can be restricted from entering some important warehouses in the warehouse area.
In addition, the number of reading times can be set for some reading tags through the software. These identification labels are issued to goods outside the system for use. When used for a certain number of times, the label becomes invalid automatically. At this time, these goods need to be reviewed and reissued with new labels, so that the management of the goods will develop in an intelligent direction.
The application of radio frequency identification technology is just emerging in our country. As an intelligent and informatized management method, it has received due attention from the technical department. While introducing and digesting foreign advanced technology, our company has designed practical and economical radio frequency identification technology application products based on the actual situation of our country, which provides a powerful means for the development of warehouse management in our country.
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