Research Of RF Tag In Automatic Identification Of Freight Containers System

With the development of global economic integration, the amount of international trade rises rapidly. Container, the main carrier of international transport, plays a much more important role in the trade. Now, China has been the center of world manufacture, which leads to a rapid development of freight container transport and the throughput has been ranged top for five years. In modern container terminal, the ability of logistic management and informationization has been the critical factor for the development of container transport.In this condition, it's necessary to record and collect the logistic information during the transportation by RFID, besides, it can do a real-time trace to the information, so the mistakes can be reduced. The application of the technology will raise the efficiency by raising the put-in speed, besides, it will provide with guarantee of safety and reliability so that the service level will be raised comprehensively. However, there are quite few companies studying RFID technology in this field oversea, much fewer in China.The paper does some basic work about freight container RF tag, the main contents includes:According to the demand analysis of container and actuality of RF tag incontainer port, the paper simulates RFID radio frequency identification system taking2.45GHz active tag as the carrier, besides, it gives some advice to international stand《Freight containers—Automatic identification》according to 18000-6B and18000-6C.The tags designed in this paper use MSP430F1232 as MCU and nRF2401 as RF module. And according to the inner function, then the low-battery detecting electrocircuit has been designed. Besides, ultra-frequency antenna which fits the tag has been designed according to microstrip line theory. At last, the functions such as, system control, data TXD/RXD, serial communication, RF were realized. The software was programmed and debugged under IAR Embedded Workbench compiled environment so that the date can receive and dispatch safely.The paper studies the mechanism of RF tag anti-collision, besides, it makes a comparison between some algorithms of anti-collision. According to automatic identification of freight containers, self-adapting anti-collision algorithms designed based on slotted ALOHA algorithms, which raise the efficiency of channel and reduce the power consumption.The paper analyses the data transmit safety mechanism of RF tag and reader. Based on the traditional symmetry distinguish theory, the paper emphasis on algorithms of data encryption standard and completes the encrypt/decrypt program of DES data encrypt algorithms.