共查询到18条相似文献,搜索用时 156 毫秒
1.
分析了基于射频识别(RFID)的定位系统的性能,针对现有的RFID定位系统在定位精度、效率、可靠性、成本等方面的不足,提出了一种采用多天线阅读器的定位系统。该系统利用多天线阅读器可扩大单个阅读器定位的覆盖范围,并可根据各接收天线检测的信号强度等信息实现对目标标签的精确定位。通过灵活选择发射天线,可以避免由于阴影效应而带来的信号盲区现象。和传统的单天线阅读器定位方法相比,多天线阵列阅读器定位系统在定位速度、定位精度和抗干扰性上都具有突出的优势。 相似文献
2.
3.
4.
沈鑫 《中国新技术新产品》2023,(4):112-114
在高速公路隧道内工作的机电设备,使公路发挥更好的功能性和智能性。该文提出了一种电子标签的设计和安装方法,以提升隧道内机电设备工作的稳定性和可靠性。以电子标签+阅读器结构,分析机电设备上电子标签的最大通信距离和可以接收到的阅读器信号的大小。对高速公路隧道内的结构配置进行了分析,明确了路面宽度、隧道高度对电子标签性能的影响。对低频区域、高频区域和超高频区域的通信效果进行对比分析,提供电子标签通信模式可以选择的依据。机电设备上电子标签安装和性能测试结果显示:对于该文的电子标签安装,采用950MHz的通信频率可以同时得到最高通信准确率和最大传输距离。 相似文献
5.
6.
7.
商品包装RFID技术的数据安全研究 总被引:3,自引:3,他引:0
随着RFID电子标签在包装行业的广泛应用,其信息存储和数据传输安全问题也倍受关注.介绍了RFID系统组成及工作原理,针对标签与阅读器之间的通信过程,从完整性与保密性两个方面详细分析了RFID系统有关数据安全的关键技术及存在问题,并提出了相应的对策措施. 相似文献
8.
目的 解决目前服装企业存在的服装量大、品种多、整箱货运盘货难度大等问题。方法 将RFID技术与服装信息管理相结合,设计整箱服装信息自动化采集系统,通过对系统RFID阅读器天线数量及位置进行优化设计,同时改进RFID标签多叉树防碰撞算法,以提高服装信息检测系统识别的可靠性。结果 通过计算分析,构建了阅读器“M”形四天线空间分布全覆盖检测模型,同时配合服装检测系统的识别软件完成了批量服装电子标签可靠性检测,对最大服装包装箱的检测准确率达到了100%。在系统的检测速度为60 m/min时,每分钟的理论识别量可达到2 600件。结论 有效提高了服装信息检测系统的可靠性和采集效率。 相似文献
9.
当许多公司正积极探索射频识别(RFID)技术应用的价值时,另一些公司就已经发现了其价值存在于有源RFID电子标签的使用上。
有源电子标签的使用更倾向于一种闭环应用,不管是对直接节约、过程改进还是提供更好的顾客服务,都为投资回报率提供了最清晰计算手段。这种应用会使商家完全控制这一闭环系统,而不会过分依赖外部的供应商或用户。 相似文献
10.
RFID技术是一种非接触式的自动识别技术,它是通过阅读器发射射频信号,RFID系统的射频信号将通过空间耦合来实现自动识别目标对象并获取相关数据,同时也可以将新的数据信息写入RFID标签的标志设备的技术,[1]是以电子识别手段赋予商品一种智能化内涵的新技术。随着RFID标签的广泛使用,对RFID标签天线的制造方案提出了更高的要求。目前,RFID标签天线的制造工艺主要有四种工艺。本文主要介绍四种RFID标签天线的四种制造工艺方案,并对每种制造工艺方案进行了分析,为RFID标签天线的制造方案提供了理论依据。 相似文献
11.
Globalization has opened practically every country in the globe to tourism and commerce today. In every region, the volume of vehicles traveling through border crossings has increased significantly. Smartcards and radio frequency identification (RFID) have been proposed as a new method of identifying and authenticating passengers, products, and vehicles. However, the usage of smartcards and RFID tag cards for vehicular border crossings continues to suffer security and flexibility challenges. Providing a vehicle's driver a smartcard or RFID tag card may result in theft, loss, counterfeit, imitation, or vehicle transmutation. RFID sticker tags would replace RFID tags as vehicle border passes to solve the mentioned problem. The RFID sticker tag adheres to the windscreen, side screen, dash, hood, or door of the vehicle, or any other acceptable location. Any damage or stripping from the installed location may cause data corruption and cannot be reused. Overall, these sticker tags will make the border crossings more secure and efficient. This article focuses on designing a rectangular-shaped RFID sticker tag antenna made of graphene sheets as a possible solution for smart border crossings. The proposed antenna is mathematically designed and analyzed with CST software to determine the optimum parameters. The design parameters are then used to create an antenna on a prepared graphene sheet. The performance results are carried out with CST software and a network analyzer. The designed RFID antenna stick on a car windscreen offers approximately 900 MHz bandwidth over the frequency range from 1.8 GHz to 2.7 GHz with an average gain of 1.23 dBi at the frequency to be used of 2.4 GHz microwave RFID band. The radiation is an omnidirectional pattern. The proposed graphene-sheet rectangular-shape monopole antenna is compact, low-cost, and bendable to fit into the windscreen of a car while retaining excellent wave propagation capabilities. These findings illustrate the suggested antenna's potential as an RFID tag antenna in a vehicular smart border pass system. 相似文献
12.
为提高RFID系统识别率,优化设计RFID系统,需要确定影响RFID系统识别率的关键因子.基于关键过程输入变量、关键过程输出变量的模型,提出了一种分析影响RFID系统识别率关键因子的试验设计方法,并确定了关键因子为标签与读写器平面夹角、读写器天线数量、标签与读写器距离.通过测试,分别在标签嵌入汽车轮胎未硫化和硫化两种情况下,进一步确定影响嵌入式RFID系统识别率的各关键因子.最后,应用MINITAB统计软件,采用二项logistic的回归分析方法,分析了各关键因子对识别率的贡献情况.统计分析结果有利于优化设计RFID系统,提高RFID系统识别率. 相似文献
13.
分析了射频识别(RFID)系统阅读器与标签通信的二进制树算法,指出在标签识别过程中,阅读器并不知道是否识别完标签,阅读器会以连续多次没有接收标签响应为依据结束对标签的查询,这样往往会造成标签漏读或浪费时间在已识别完的标签上。基于此分析,提出了判断二进制树中标签识别完毕的方法。该方法通过在阅读器中设置计数器,就可以很好地跟踪标签的识别情况,准确地判断出标签是否识别完毕。分析结果表明,该方法可以准确地判断标签是否识别完毕,增加系统识别效率和可靠性。 相似文献
14.
W.-P. Lin C.-H. Ku 《Microwaves, Antennas & Propagation, IET》2009,3(8):1199-1205
This study presents a distributed antenna structure operating at a frequency of 915 MHz to increase the tag identification sensitivity for passive radio frequency identification (RFID) systems. The distributed antennas are connected to a reader with a four-port power splitter/combiner which consists of Wilkinson power splitters (WPSs), band pass filters (BPFs) and power amplifiers (PAs). Due to the polarisation of the electromagnetic field, the antennas are positioned on opposite sides in both vertical and horizontal directions of the object. This positioning improves the performance of the system, and increases the sensitivity when identifying unclearly positioned tags. An experimental RFID system is also set up to demonstrate the proposed structure. Simulation and experimental results indicate that using four distributed patch antennae can improve tag identification in passive RFID systems. 相似文献
15.
针对工业炸药生产、仓储、销售和使用等全流程安全监管问题,提出用RFID(radio frequency identification)进行产品标识与产品信息获取,构建工业炸药全流程监控系统。为了解决工业炸药物理实体与监控系统信息的映射,提出可监控单元模型。该系统是多层分布式的体系结构,由数据采集层、数据处理层和数据服务层组成,并详细描述了各层的功能;该系统采用C#、ASP.Net和SQL Server 2005开发,运行在Windows平台。在企业生产线现场应用结果表明,当RFID读写器与贴有RFID标签产品距离保持在2~4 m之间时,标签读取准确率可以达到99.9%。 相似文献
16.
The propagation characterisation of a 2.45 GHz microwave semi-passive radio frequency identification system in real indoor environment is presented and the effects of three system parameters: the reader orientation, tag antenna designs and propagation environment are evaluated. The unmodulated forward propagation is evaluated by reader signal strength measurements at different tag positions while the modulated backscattered propagation evaluation employs tag read rate as a function of range under horizontal or vertical reader polarisation in an uncluttered or cluttered indoor environment for different tag antenna types. Measured results are used to quantify the variations introduced by the reader polarisation, indoor propagation environment relative to free-space and tag antenna design on the tag response. 相似文献
17.
Harma S. Plessky V.P. Xianyi Li Hartogh P. 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2009,56(4):812-820
We discuss the feasibility of surface acoustic wave (SAW) radio-frequency identification (RFID) tags that rely on ultra-wideband (UWB) technology. We propose a design of a UWB SAW tag, carry out numerical experiments on the device performance, and study signal processing in the system. We also present experimental results for the proposed device and estimate the potentially achievable reading distance. UWB SAW tags will have an extremely small chip size (<0.5 times 1 mm2) and a low cost. They also can provide a large number of different codes. The estimated read range for UWB SAW tags is about 2 m with a reader radiating as low as <0.1 mW power levels with an extremely low duty factor. 相似文献
18.
金属介质对射频信号的干扰一直以来影响着射频识别技术(RFID)的有效应用。为了研究导致干扰发生的机理以及解决办法,以超高频段RFID系统为对象,依据电磁场相关理论,进行了一系列实验。通过对实验所得数据的分析,验证了金属介质对RFID被动标签读取率的影响,并进一步发现标签和金属介质表面间隔距离与读取率之间的变化关系。另外,发现了附加金属层产生的同相位电场对标签读取性能的放大作用。最后,根据实验研究结果,提出一种可用于金属表面的RFID被动标签的设计方案,该设计方案不但可以有效消除金属干扰的负面影响,还可在原有读取性能的基础上进一步提高读取率,同时兼顾使用方便性和制造成本两方面。 相似文献