| Agricultural product is the most basic daily life dependent goods. Since agricultural planting, management, harvesting, storage and marketing and other aspects of various potential risks are present, food quality and safety is threatened various factors. Using RFID(Radio Frequency Identification) reader track record of agricultural products from production to sales of the links. Both to prevent the phenomenon of counterfeit products of inferior products occurrence, but also to ensure product quality and safety.RFID is radio frequency identification technology, it is a non-contact automatic identification technology, bi-directional data communication with the target object by way of radio frequency, to obtain information about the target object. With the development of modern information technology, RFID technology because of its high security, information storage capacity, can identify the characteristics of non-contact has been widely used.In this paper, the main agricultural product traceability based on ARM embedded platform UHF RFID Reader.The first of the basic theory of RFID systems were studied, including embedded technology, RFID technology and operating systems transplantation. Then based on these theory, completed the system hardware structure design and the development of application software, the system is divided into three parts: the first part is the RFID embedded module, S3C6410 as microprocessor chips, and transplant the Linux operating system in the chip, through the SPI interface to communicate with rf transceiver module; the second part is an RFID transceiver modules, selected as a low-power chip CC1101 RF transceiver chip, and increase the power amplifier RF transceiver circuit to achieve system power requirements; The third part is the software design of the system, under the arm-linux compiler environment using C language to complete the Linux operating system migration, Compilation work and reading and writing tasks to create applications, and a variety of anti-collision algorithms are analyzed and compared, application of Modified Adaptive Multi-tree anti-collision algorithm to solve the system of multi-tag collision problem.Test the system analysis, the results of the study show that the reader can read the tag information, identification range of up to 8m, single tag read the average time of 4ms, the reader reads the tag strong stability, good anti-collision performance. Finally, the design of the RFID reader applications in rice marketing chain traceability system, the completion of the identification of rice EPC encoding tag. |
