Sensors & Transducers, Vol. 154, Issue 7, July 2013, pp. 103-112
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In this paper, based on the RFID technology of spare parts management system designed to do some elaborate, discussed the RFID technology in spare parts management system application convenience, describes the system of whole process and data analysis in the design of spare parts management [1]. With the continuous development of RFID technology and the electronic label price gradually reduced, the technical aspects of the advantages and potential use value will change the face of spare parts management, spare parts management to bring new opportunities and challenges. In the RFD system, when the electronic label is a passive tag, often require the base band coding in each of the two adjacent data bits with the jump features, the adjacent data has a jump code, can not only ensure the in successive " 0" when the electronic tag energy supply, and is convenient for electronic label from the received code to extract the clock information risk. In the actual data transmission channel, because of the presence of interference, the data will be the error occurred during transmission, and then request channel coding can provide a measure of the ability to detect errors. The working principle of RFID is reader in certain areas within the transmitting electromagnetic waves. The electronic label having a resonant circuit, when the label into the magnetic field induced current, can obtain energy, clock and instruction, and the useful data to backscatter modulated transmitted. Reader receives and decodes the labeled data, into the central information system data processing. Thus, the reader through the antenna can realize the noncontact electronic tag reading and recognition in the preservation of the data, to achieve the purpose of automatic object recognition. RFID is radio frequency identification technology (Radio Frequency Identification) English abbreviations. Radio frequency identification technology is nineteen nineties started an automatic identification technology. RFID technology use radio frequency in the reader and tag between the noncontact two-way data transmission, to achieve the target identification and for the purpose of data exchange. In foreign countries, radio frequency identification technology has been widely used in industrial automation, business automation, transportation control management, asset management and other fields. The paper presents the application of management information system in Internet of things based on RFID technology.
2. The Research of RFID Technology
In general, the RFID system consists of 5 components, including a transmitter, receiver, a microprocessor, antenna, and label. Transmitter, receiver and a microprocessor is usually packaged together, and are collectively referred to as the reader (Reader), so the industry often RFID system will be divided into reader, antenna and tag three
components, the three components are generally available from different manufacturers. RFID source in radar technology, so the working principle and the radar is very similar to it [2]. The first reader via the antenna electrical signaling, label after receiving the signal transmitting internally stored identification information, reader and then received by the antenna and the identification tag information sent back to the last reader, then the recognition result is sent to the host. Label use three methods for data storage: electrically erasable programmable read-only memory (EEPROM), ferroelectric random access memory (FRAM) and static random access memory (SRAM). General radio frequency identification system mainly uses EEPR0M mode. The drawback was the writing process of power consumption is very large; the service life is generally 100000 times. There are also manufacturers adopt the mode of FRAM. FRAM write power consumption for EEPROM 1/100, EEPROM 1/1000 write time. FRAM belongs to the nonvolatile memory. However, FRAM due to production problems has not been widely used. SRAM fast write data, applied to a microwave system, but SRAM needs an auxiliary battery uninterrupted power supply, in order to save data. RFID anti-collision algorithm for improving mine supplies and personnel tracking reliability is the key technology, the system uses the line for the link tag collision detection algorithm, this algorithm needs only in electronic tag configuration 1 8 bit register, 1 1 " 0 ", " 1 " random number generator and 2 4 a 1 counter and a small selection of addition and subtraction circuit can achieve up to 1048576 tag arbitration. The simulation results show that this algorithm produced collision probability is significantly smaller than the binary algorithm, at the same time through register high flexible setting, also effectively solves the problem of low density labeling patio-temporal transfer rate high, which further reduces the collision probability. RFID system generally consists of 4 part