教学课程资源库 更多>>

关键词： New owner privacy   ownership transfer   permutation function   protocol   RFID   ultralightweight  

摘要： Modern business models improve the efficiency of supply chain management by attaching tags to products. These tagged products typically change owners multiple times during their life cycles. The ownership transfer protocol authorizes the new owner by replacing the old owner's authentication information stored in the tag with the new owner's. Until now, a considerable amount of literature has proposed solutions to the problem of RFID ownership transfer. Unfortunately, these existing protocols are either flawed in some security properties especially in protecting new and old owners' privacy, or are associated with huge computational overheads. In this article, we propose an ultralightweight RFID ownership transfer protocol based on permutation function. The tag and reader only use efficient bit operations, which greatly reduce the computational overhead. An important feature of the proposed protocol is that the new owner can impose calculations on data that has been encrypted by the old owner. The new owner is authorized by the old owner and does not have access to the tag's key, which protects the old owner's privacy stored in the tag side. We compare our protocol with existing work, and show the advantages in terms of security, computational overhead, and time cost.

关键词： 13.56 MHz radio frequency identification (RFID) systems   domino-resonators   energy harvesting   modeling   RFID sensors  

摘要： This article presents a straightforward design algorithm to enhance power and data transmission for 13.56 MHz radio frequency identification (RFID) sensor applications by using domino-resonators. In this algorithm, the transformed transponder impedance and modulation depth seen at the reader antenna are formulated and modeled under the presence of domino-resonators. To improve the accuracy, the voltage-clamped mode of the tag integrated circuit (IC) is considered, which enables accurate calculation of the maximum readable distance, transferred power, and equivalent tag IC impedance. For the sake of simplicity, a type-A ultralight tag IC is used and modeled, while all resonators and tag antenna dimensions are based on standard smart-card-sized coils. The design algorithm is coded in MATLAB for a fivecoil RFID system, i.e., with three identical domino-resonators, and verified using LT-SPICE simulations. For experimental validation, the designed five-coil RFID system is implemented for enhancing the distance between a commercial 13.56 MHz RFID reader and ISO/IEC 14443A standard RFID tag IC.

关键词： Low-power radio frequency identification (RFID)   medium interference   multipath effect   path loss   wireless sensor  

摘要： Mechanism analysis of the radio frequency identification (RFID)-sensor communication interference can effectively improve the information collection quality of the perception layer. In our study, multipath interference analysis of low-power RFID-sensor under a metal medium environment was considered. First, the dual-antenna RFID-sensor architecture was developed based on a low-power strategy. The multipath loss model and interference theory under a metal medium environment were discussed. Second, by full consideration of electromagnetic interference energy loss factors, the time-frequency domain characteristics of electromagnetic signals, such as direct radiation, refraction, diffraction, scattering, absorption, and polarization were analyzed. Third, the normalized electric field strength between the low-power RFID-sensor with different distances was obtained through simulation/experiment scenarios. The distance between the low-power RFID-sensor and transmitting antennas is represented by r. When r is from 1 to 5 m, the minimum working distance between the RFID-sensor antenna and the metal medium surface changes from 6.9 to 7.0 mm at a frequency of 915 MHz. This article was conducive to expanding the functions of the perception layer system of the Internet of Things (IoT) and enhancing the application potential of existing RFID and sensor networks.

关键词： RFID   UAV-SfM   Particle tracking   Soil erosion   TLS   Sediment connectivity  

摘要： To explore the processes of soil erosion at the plot scale, Digital surface model of Differences (DoD) maps (Unmanned Aerial Vehicle - Structure from Motion (UAV-SfM) method) and data from Radio Frequency Identification (RFID) tags were analysed. The comparison of differences in accuracy of UAV-SfM and 3D terrestrial laser scanner (TLS) measurements, and the integration of the UAV-SfM method and soil particle tracing with RFID tag locations were conducted to assess sediment transport in a plot in Fukushima prefecture, Japan. The Universal Soil Loss Equation (USLE) plot was installed and kept with no vegetation and no cultivation. Water and sediment discharges were measured at the outlet of the plot, and the topographic index of runoff and sediment connectivity (IC) -focused on surface roughness- was also estimated. Based on field surveys, four periods were defined. Locations of RFID tags were firstly determined by using orthoimages derived from the UAV-SfM method and then compared with those locations measured with a laser total station. The mean and standard deviation of difference amounts of UAV-SfM were of 1 and 3.3 mm, respectively. On average, the RFID tags were located with an accuracy of 3.1 cm (RMSE). Although data of tags tracing showed short transport distances with rill erosion, the results of the UAV-SfM surveys showed an increase of sediment connectivity (SC) over the study period that may explain the largest sediment discharge, especially of fine soil particles. The concurrence of higher values of SC as well as the development of new and longer rills demonstrated the important activity of net soil loss in our study site. The combination of distinct methods and techniques, all providing accurate measurements, shed light on the sediment transport process at short distances, which affects the net water and sediment discharge at larger scales.

关键词： Blockchain  

摘要： Aiming at the problems of low traceability efficiency and poor information security caused by complex data flow in the whole food supply chain from farmland to table, many participating departments, easy to be attacked and tampered with by criminals in the process of data transmission and storage, with the distributed storage and peer-to-peer transmission features of blockchain technology, some of the current problems can be solved. However, the use of blockchain single-chain architecture can no longer meet the current problems of transaction throughput decline and slow traceability time caused by the increasing data information of the entire food supply chain. At the same time, although the use of blockchain technology can ensure the security of data storage, it cannot ensure the absolute security of data information in the collection and transmission process. In response to the above issues, this article first analyzes and classifies the data information of various links in the food supply chain, integrating blockchain multi chain architecture and RFID technology, a blockchain multi chain food information traceability management model BRFCS (multi-blockchain and RFID Food credible and safety） is proposed. Then, combining cryptography algorithm, a trusted collection and transmission mechanism is proposed among blockchain, reader and tags;Finally, a traceability prototype system was built based on Chainmaker blockchain network platform, and the uploading success rate and traceability query time were tested through the data of a wheat product company. The results show that the traceability management model proposed in this paper can meet the needs of consumers and enterprises in the supply chain in terms of security and traceability time, and at the same time provide a new optimization solution for the safe data transmission, storage and traceability mode of the food supply chain industry. © 2023, The Authors. All rights reserved.

关键词： Chipless RFID tag   time reversal algorithm   energy focus   multi-tag identification   MIMO-TR antenna array   >  

摘要： A chipless RFID identification based on time reversal algorithm is presented in this work. The key problems affecting the reliability of chipless RFID identification are analyzed by using the energy focusing feature of time reversal algorithm. Analysis carried out on the energy focusing model revealed that the time reversal array can realize the multi-antenna energy focusing at the tag, so as to improve the reading distance of chipless RFID tag. Furthermore, time reversal energy self-focusing algorithm was used to suppress the noise come from other scatters near the tag. Multi-tag identification can be realized by the application of selective focusing algorithm. MIMO time reveal antenna array and C shaped resonators chipless RFID tag simulation model is constructed to verify the correctness of the proposed method. The results show that two chipless RFID tags with a distance of 0.2 m in azimuth can be identified from 1 m away.

关键词： 射频识别   室内定位   特征参数   标签   定位算法  

摘要： 随着物联网技术发展,人们对室内物品或人员位置的感知需求正在逐渐提高。目前基于RFID的定位技术在许多定位场景中得到应用,如仓库特定物品搜寻定位、物体或人员运动轨迹跟踪等。为推进基于RFID室内定位技术的研究,从RFID系统的通信机制出发,对不同信道特征参数信息的获取及标签定位处理方法进行了总结;接着对基于不同特征参数信息定位方法进行了分析对比。最后,展望了RFID室内定位技术的发展趋势。

关键词： 正交调幅通信   可计算射频系统   抗干扰设计   多机器人协同  

摘要： 为了开发一种新型正交调幅可计算射频识别系统,并将之应用于包括无人工厂在内的多机器人协同系统,使用HQAM硬件算法,开发一种16进制射频识别系统。系统中控制端采用有源嵌入式控制系统,识别节点端即射频发送端采用无源模拟电子系统,在硬件方面使用滤波系统和比较电压模拟计算系统控制其精度,算法方面采用多次激发和结果决策方案解决干扰问题。经过仿真实验和现场实验,该系统可以满足多机器人协同的现场识别管理。

关键词： RFID   NFC   物联网   非接触式支付   非接触式支付安全  

摘要： “物联网”一词近几年逐渐走进人们的生活,正推动人类社会从“信息化”向“智能化”转变,通过各种网络技术及射频识别等传感设备,将对象进行独立标识,按需求连接起来,进行信息传输和协同交互,以实现对物端的智能化信息感知、识别、定位、跟踪、监控和管理等。人们把射频识别技术(RFID)作为物体标识的代表,随着技术的进步,起源于RFID技术的近场通信技术(NFC)在各个领域发挥巨大的作用,其中非接触式支付是一项巨大的进步。

关键词： Radio frequency identification   Passive sensor   Humidity-temperature-light-carbon dioxide sensor   Low cost  

摘要： In recent years, radio frequency identification (RFID) technology has been widely used in smart agriculture. In order to measure the multi-dimensional environmental information during the planting of agricultural products, this paper proposes an integrated humid temperature phosgene (HTLC) sensor based on passive RFID. The structure is optimized by the HFSS software and the multi-dimensional integrated sensor is prepared by engraving. The passive RFID HTLC multidimensional sensor operates stably at 10-50 %RH, 5-25 & DEG;C, 700-1900 lux and 800-1600 ppm. The frequency shift is 80 MHz at 10-50 %RH and the sensitivity is 2 MHz/%RH. In the temperature range of 5-25 & DEG;C, the amplitude change is 12.58 dB and the sensitivity is 0.63 dB/& DEG;C. For 700-1900 lux light, the amplitude variation is 10.03 dB and the sensitivity is 0.02 dB/Lux at room temperature. For CO2 concentrations of 800-1600 ppm, the sensor has an amplitude change of 9.43 dB and a sensitivity of 0.012 dB/ppm. The sensor has the advantages of low cost, fast response, good repeatability and good stability, and can collect and display the parameter information of the crop growth environment in multiple dimensions, making the monitoring and management more accurate and intelligent, and helping to adjust the growth environment of the crop in time, thereby improving the yield of the crop.