超高频射频识别阅读器的频谱研究与系统设计

发布时间：2018-01-28 02:23

本文关键词： 超高频射频识别阅读器频谱分析 FPGA PIE编码　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：近几年来，物联网被确定为中国战略性新兴产业之一，作为其中最关键的技术之一，射频识别技术(Radio Frequency Identification, RFID)是必随着物联网的发展而逐步扩大。射频识别技术通过无线电磁波信号进行无接触的双向数据通信，获得相关数据信息，以此实现对目标的识别。超高频(UHF)射频识别技术具有通信距离长，可识别运动目标等优点，目前已经广泛应用于物流管理、门禁控制等需要快速处理和收集数据的领域，，尤其是未来商业供应链的市场前景广阔。本文的主要工作如下：基于射频识别技术的基础理论和超高频射频识别技术的通信协议标准，从频谱分析入手对国际标准协议中规定的调制方式以及基带信号进行了分析与研究。对比分析了双边带振幅键控(DSB-ASK)、单边带振幅键控调制(SSB-ASK)、反相位振幅键控调制(PR-ASK)的调制方法和信号频谱，分析了不同调制方式的特点；探讨了残余边带调制在RFID系统当中应用的可行性和设计难点；通过分析和探讨后搭建了UHF RFID阅读器的硬件平台，符合ISO18000-6C协议标准。采用零中频架构，调制方式为PR-ASK调制，基带电路由单片机、FPGA和数模转换芯片组成。此外，还对基带电路的现场可编程门阵列芯片（FPGA）程序进行了设计，设计实现了包括PIE编码程序和数模转换芯片配置程序在内的相关设计。最后，对阅读器模块电路以及整机进行了测试验证，提出了改进意见，为后续设计工作提供参考。文中所述阅读器系统的FPGA程序采用Quartus II9.1软件进行设计。经过多次设计与调试之后，实现了预想的功能。经过测试，阅读器能够成功识别相应的电子标签。实测结果表明，该阅读器工作性能良好，工作状态稳定，符合设计标准。
[Abstract]:In recent years, the Internet of things has been identified as one of China's strategic emerging industries, as one of the most critical technologies. Radio Frequency Identification. RFID (Radio Frequency Identification) is a kind of bidirectional data communication, which must be expanded with the development of the Internet of things. Radio frequency identification (RFID) technology can get the relevant data information through wireless electromagnetic wave signal. UHF (UHF) radio frequency identification (RFID) technology has many advantages such as long communication distance and the ability to identify moving targets, so it has been widely used in logistics management. Access control and other areas requiring rapid processing and data collection, especially in the future business supply chain market prospects. The main work of this paper is as follows: The communication protocol standard based on radio frequency identification technology and UHF radio frequency identification technology. The modulation mode and baseband signal stipulated in the international standard protocol are analyzed and studied from the spectrum analysis, and the bilateral band amplitude keying (DSB-ASK) is compared and analyzed. The modulation method and signal spectrum of single sideband amplitude keying modulation (SSB-ASK) and inverse phase amplitude keying modulation (PR-ASK) are analyzed. The feasibility and difficulty of application of residual sideband modulation in RFID system are discussed. After analyzing and discussing, the hardware platform of UHF RFID reader is built, which conforms to the standard of ISO18000-6C protocol. It adopts zero-intermediate frequency architecture, and the modulation mode is PR-ASK modulation. The baseband circuit is composed of MCU FPGA and digital-analog conversion chip. In addition, the FPGA program of the baseband circuit is designed. Design and implementation of the design including PIE coding program and digital-to-analog conversion chip configuration program. Finally, the reader module circuit and the whole machine are tested and verified, and the improvement suggestions are put forward. It provides reference for further design work. The FPGA program of the reader system described in this paper is designed by Quartus II9.1 software. After many design and debugging, the desired function is realized and tested. The reader can identify the corresponding electronic tags successfully. The experimental results show that the reader has good performance, stable working state and meets the design standard.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP391.44

【参考文献】