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关键词： 短距离无线通信技术   数字调制   射频识别   无源互调  

摘要： 随着通信技术的发展,以短距离无线通信技术为主的终端设备在工业自动化、智能家居、个人消费领域显现出巨大的市场需求,其一般以低成本、低功耗、便携网络通信为主要特点,有效地补充了蜂窝移动网络的覆盖面,每天世界上有数亿台短距离无线通信设备在同时使用。针对在生产、测试环节广泛使用的短距离元线通信设备,项目开展了数字调制、矢量解调、通信性能和测量方法方面的研究工作,通过测量技术方面的创新和测量平台的研制,完成了无线局域网測试仪、蓝牙测试仪、射频识别测试仅、ZigBee综合测试仪的国家计量技术规范的制定和校准平台的建立,构建了短距离无线通信技术溯源体系,解决了国内短距离无线通信设备测量标准和技术规范缺失的问题,填补了国内无线电计量领域的多项空白,确保了量值溯源的准确可靠。

关键词： RFID技术   高校图书馆   流通服务   应用  

摘要： RFID技术在高校图书馆内的使用,是近几年高校图书馆发展的必然趋势。图书馆作为大学高校科研文献和教学信息存储的中心,为高校教育教学活动与科学研究提供了服务,对高校的发展十分重要,是高校教育的重要支柱。RFID标签的使用让流通服务工作也被赋予了新的内容,自动化系统的使用,使图书馆流通部人员的工作性质有了全面的改变,全自动借还设备的使用在节省了人力的同时也大大提高了服务效率,但同时也存在一定的弊端。

关键词： 校车安全   监控系统   STM32   GSM   OneNET   WiFi   GPS   RFID  

摘要： 随着经济的发展,校车普及度越来越高,为了确保学生的乘车安全,拥有一个安全的校车监控系统是很有必要的。目前,市面上的校车监控系统主要是对车辆的监视,缺少对人员信息的采集及分析。为了解决上述问题,本文设计了基于物联网的校车安全监控系统。该系统由STM32F103核心控制、GPS定位、GSM短信、RFID读写、WiFi以及OneNET云平台等多种模块构成。通过RFID读写器对IC卡的读写,能够对学生的乘车信息进行判断和统计,并结合GSM短信收发模块将学生的乘车信息发送给学生家长;再将GPS模块分析出来的经纬度和车辆的运行速度通过WiFi模块上传到云平台,实现远程监控,确保学生的乘车安全以及校车的运行安全。

关键词： 射频识别技术   GPS定位技术   监控系统  

摘要： 本文设计以微处理器STM32为核心,融合了传感器技术、无线通讯技术以及GPS定位技术,并结合了当前主流的软件开发技术开发冷链物流监控系统,通过手机作为定位、温度、PH值、溶解氧等数值的查询终端,实现了对水产品冷链运输的实时监测,从而有效地提高水产品的新鲜程度及质量,同时水质数据为水产养殖员或研究者提供数据资料和实验平台。

关键词： RFID   图书馆   电子标签  

摘要： 阐述了RFID技术的基本工作原理,该项技术应用于图书馆管理工作的优势,探讨在使用过程中发现的问题,提出了改进的措施和建议。

关键词： Passive UHF RFID tag   Energy harvesting   Augmented RFID tag   Low power sensor   Power consumption management strategy  

摘要： When it comes to management modernization of greenhouses, UHF RFID technology, with its passive character and low-cost and power consumption, presents a very efficient solution. To this end, an EPC global C3 SL900A sensor tag is enhanced by integrating energy harvesting and multi-sensing capabilities. The challenge of using only the fundamental carrier as an energy-harvesting source without the need for other auxiliary energy or battery source is considered and evaluated. The developed architecture uses a deep power consumption management strategy and operates autonomously under full passive mode for sensing the required parameters in the grown monitoring process. This architecture does not integrate any chemical components or batteries, making it safe and more suitable for agriculture-related applications. It can also be considered as an auto-adaptive data-rate sensor device, such as the rate change according to the amount of harvested energy. Furthermore, this architecture can write all sensors' data simultaneously into the tag IC user memory. This latter is easily accessible by any standard UHF RFID reader. (c) 2021 Elsevier B.V. All rights reserved.

关键词： RFID技术   物流仓储作业   系统定位   自动定位  

摘要： 针对传统物流仓储作业系统自动定位方法存在定位精度低、定位时间长、定位误差较大的问题,基于RFID技术研究了一种新的物流仓储作业系统自动定位方法。在基于RFID技术的物流仓储作业系统定位整体架构的基础上,对物流仓储作业系统的行驶路径进行定位模拟,并针对无人搬运车系统进行了行驶的精确定位和停车定位,并对行驶的路径进行了准确的绝对位置分析,从而确定小车所在位置,完成物流仓储作业系统的自动定位。对比实验结果表明,所提方法的定位误差较小,定位时间较短,提高了小车所在位置的定位精度,且实用效果更好。

关键词： 自动化技术   物联网技术   射频识别   无线传感网  

摘要： 气矿是社会经济发展的重要资源,智能气矿概念自2010年在国内兴起,即刻在矿业界引起极大震动。我国气矿技术的发展经历了原始阶段到机械化,再到数字化,现在正全力向智能化迈进,然而在该领域自动化技术与物联网技术的应用研究还处于空白阶段。因此,想要提高气矿行业的信息化水平和气矿企业的竞争能力,进一步提高工作效率,需要充分借助物联网技术与自动化技术的支撑。本文首先介绍气矿的相关内容,再分析目前存在的问题,最后论述自动化技术与物联网技术在气矿行业的具体应用。

关键词： Detection of defects   Detector design and construction technologies and materials   Microwave Antennas  

摘要： It can be ensured safe and reliable operation of a metallic structure by monitoring the positions which are easy to crack. Because the channel changes with the environment, a tag sensor in the ultra high frequency (UHF) is vulnerable to interference. This paper aims to investigate the reliability of passive RFID sensor systems with a reference tag for crack detection of aluminum alloy structures when the condition of reading distance and surrounding environment changes. The impedance and gain of tags are simulated, which provides theoretical basis for experimental analysis. With an increase of crack depth, the impedance of the sensor tag shifts to the low frequency direction, and the reference tag changes slightly. When dual tags are placed orthogonally, the gain of the sensor tag changes greatly, which means that it is more sensitive to crack depth. The backscatter power of the sensor tag shows a decline trend, and the power of the reference tag remains unchanged. The sensor features a linear response with the variation of crack depth. The sensitivity of crack characterization is better when dual tags are placed orthogonally.

关键词： Ultralightweight   RFID   Security and privacy   Authetication   Permutation  

摘要： Due to low-cost, ease of use and convenience, Radio Frequency IDentification (RFID) is a contactless technology that has become more and more promising for automatic identification of an object and people without physical contact. However, the RFID system faces major issues related to its security and privacy, where an adversary may eavesdrop, temper, modify, and intercept the transmitted messages over a communication channel. To overcome these issues, there is a flexible and effective way to implement an ultralightweight RFID scheme. Therefore, we present an ultralightweight RFID authentication scheme using permutation operation named URASP in this paper. Our proposed scheme integrates permutation and left rotate operation to provide a higher level of security and privacy without increasing storage and computation overhead. In addition, the informal analysis of our proposal illustrates its ability to overcome all known security attacks. We show that the proposed URASP scheme preserves the properties of tags untraceability and information privacy by using Juels and Weis privacy model. The performance analysis has been performed which demonstrates that the proposed scheme outperforms other existing schemes as well as utilizes fewer resources on tags. The verification of our scheme has been done using Scyther simulation tool. Thereafter, the correctness of our scheme has been verified by using BAN logic inference rules. Hence, the proposed scheme is more suited for low-cost passive RFID tags.