Study On The Key Technologies Of Energy Self-sufficiency Low-power Active Tags

In recent years, radio frequency identification (RFID) technology has attractedwidespread attention and research. The current research work is mainly targeted atpassive RFID system. The research carried out specifically for active RFID system isrelatively rare. In this paper, the main components of the active RFID systems-activetag is the object, and the author carried out a systematic study of its key technologies:applying co-processing circuit to reduce the energy consumption of the active tags,developing anti-collision algorithms and security authentication protocol suitablefor active tag, designing energy management system which can support active tagsindependent access to the solar environment, as well as the applying active tags tolocate specific items. Innovative works in this paper are as follows:The author proposes the method that can take use of co-processing circuit auxiliarymicrocontroller to reduce the energy consumption of active electronic tags. Theco-processing circuit auxiliary microcontroller can do instruction parsing andcommand legitimacy of discrimination, so that the microcontroller can maximize adormant state. The simulation and experimental results show that this method canobviously reduce the energy consumption of active tags. Especially in a multi-labelapplication, it can significantly reduce the average energy consumption of electronictags.The author also designs the DFSA-RBTS anti-collision algorithm for active RFIDsystem, ADFSA-RBTS anti-collision algorithm and the security authenticationprotocol of which the mutual authentication is the core. The Local ID randomlygenerated from rag and the slot code Solt are the targets of the DFSA-RBTSanti-collision algorithm, and the algorithm considers security issues in the initial timeinvolved in the communication of the tags, so that the security of the system in theanti-collision process can be guaranteed. DFSA-RBTS algorithm can achieve athroughput of more than40%. ADFSA-RBTS algorithm improves DFSA-RBTSalgorithm, making throughput increase by7percentage. Security authenticationprotocol designed in this paper combines Hash functions and encryption algorithms,makes two-way authentication between the reader and tags. The protocol can supportactive RFID system to receive fresh news from the tags. At the same time, the protocol provides the system with the safety performance that can effectively resistthe common security attacks.Besides, the author also provides a good method with high performance of usingactive tags to achieve position. Prior to the start of each positioning operation, thereader can obtain ranging error distribution by collecting the ranging information ofeach of the known reference tags and positioned tags. Then we can use theenvironment parameters from this information correction ranging formula to improvethe accuracy and stability of the RSSI ranging. The algorithm of combining theabsolute distance and the relative distance to calculate the position coordinates canapparently improve the accuracy of positioning.