RFID (RadioFrequencyIdentification) is a non-contact automatic identification technology. Its principle is to use the radio frequency method for non-contact two-way communication to realize automatic identification of objects. Due to its high-speed moving object recognition, multi-target recognition and non-contact identification, RFID technology strongly promotes the development of home automation, industrial automation, and modern logistics. This paper proposes a scheme based on 2.45 GHz active radio frequency identification system. The system communication protocol was planned with reference to the ISO18000-7 standard. The hardware system and the C++-based PC and electronic map system were designed. The system label scanning, label capacity and recognition efficiency were optimized and improved in the laboratory environment. The reliability and applicability of the system has been enhanced.
1 System design scheme 1.1 Multiplex section protection The point-to-multipoint system consists of a central monitoring device (main reader) and a series of remote terminal devices (from the reader) to form a point-to-multipoint multi-tasking wireless communication system. . The main reader is connected to the slave reader and the slave readers via a twisted pair cable. The reader can be used as a data relay station to temporarily store data and extend the distance. Data transfer to the communication method. Each slave reader is remotely powered by the main reader via a twisted pair cable, which simplifies the system structure and reduces costs. In order to ensure the reliability of data transmission and system power supply, a multiplex section ring structure is formed between the readers, and the reliability of the structure is greatly improved compared with the chain structure.
1.2 Hardware platform The hardware platform of the system mainly includes the main reader and the slave reader. The reader is responsible for reading data from the tag, packetizing the data, passing it to the main reader, and finally to the host. Considering the communication distance, transmission power, cost, and power consumption required for indoor positioning, active electronic tags are selected here for system construction. In order to meet the requirements of system design, such as stable transmission and reception, high signal detection sensitivity and low transmission power, the system selects NRF2401 wireless transmission chip and micro control module based on Atmega8L.
The control unit is composed of an MCU and an encoding circuit, and mainly accomplishes the following tasks: 1 communicating with the PC of the application system software and executing instructions sent by the system; 2 controlling the communication process of the electronic tag; 3 encoding and decoding the signal; 4 performing the anti-collision Algorithm; 5 encrypts and decrypts data to be transmitted between the electronic tag and the reader; 6 performs authentication between the reader and the electronic tag. The system structure is shown in Figure 1.
Figure 2 shows the hardware platform module of the unit system. The system has functions such as working status indication and power control, moving target position identification, and information monitoring. The query mutual control is better.
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