【作者】 刘锡杰；

【导师】 蒋国平；

【作者基本信息】 大连理工大学 ， 物理电子学， 2007， 硕士

【摘要】 射频识别技术(RFID)是近年来发展极为迅速的一种非接触式自动识别技术，目前在理论和实际应用方面都十分引人注目，其中超高频段(UHF)的RFID技术是国际上最先进的自动识别技术，它具有识别距离远、识别速度快、使用寿命长等特点，将广泛应用于电子路牌、高速公路收费、物流管理、产品跟踪等领域。在未来几年中，RFID技术必将逐步取代条形码技术成为EPC领域的主宰，因此UHF频段的读写器的研制有着很好的应用前景。本文针对超高频射频识别系统进行研究，以工程样机开发为主线，重点研究了数字基带控制系统和反向散射调制式射频系统的开发方法。本文选取了最新发展、协议体系最完备的国际标准ISO／IEC 18000-6C为研究对象，基带电路部分采用ARM7系列的处理器作为主CPU，负责系统的调度，外扩接口有USB2.0，RS232／485和以太网接口，选用TI系列的DSP芯片TMS320VC5509A进行信号的采集处理、运算，实现系统编码、解码、校验等功能。两个处理器之间通过FIFO电路相连，使整个基带系统协同稳定工作。射频部分采用零中频接收机方案，采用高速ADC、DAC对信号的采集和控制，最后通过嵌入式C语言和汇编语言实现系统的软件控制，并部分完成协议中规定的射频标签的操作指令。另外，本文还利用工程设计中最广泛使用的ADS对高频系统进行仿真，以使系统达到最佳性能的设计，调试过程中利用矢量网络分析仪和数字逻辑分析仪等仪器对系统进行了严格的测试，保证了系统的可靠性。本文所设计的UHF频段的RFID读写器可以兼容多种协议规范，接口资源丰富等特点，可以方便的对系统进行二次开发，使之适用于特定的RFID应用系统。基带部分的通用性，使之适用于与不同的射频系统进行相连。更多还原

【Abstract】 RFID is a new technology of non-contact automatic identification which booms up in recent several years. At the present time, both in theory and practice application aspects, it comes to the front more and more, in that UHF RFID technology is the most advanced in the world. UHF band RFID has advantages of long identification distance, speedy identification, relatively long life and so on which is applied to these domain electric street nameplate, freeway charge, Logistics Management and Strategy and tracking of products. In the future few years, the development of UHF RFID reader is perfect foreground, for the technology of RFID will be instead of bar code step by step and dominate in EPC.This paper in allusion to the research of UHF radio frequency identification system, engineering prototype development as the main line focus on the digital base band control systems and backscatter modulation of the RF systems development method. This paper selected the international standards ISO / IEC 18000-6C of the latest development, the most comprehensive agreement as the research object. Base band circuit portion adopts the ARM7 family processor as the main CPU, responsible for the scheduling and expands interfaces such as USB2.0, RS232/485 and Ethernet interfaces. Also, DSP chip TMS320VC5509A is selected for signal acquisition and processing, calculation, encoding, decoding, calibration, and other functions.The two processors connected with each other through FIFO circuit, so that the whole system can cooperate with each other steadily. The RF part introduces a zero IF receiver, It uses high-speed ADC and DAC on the acquisition and control signal, then achieves system software control by embedded C language and assembly language, and partially completes the operation of RF label instructions in the agreement.In addition, this paper also uses ADS which is the most widely used in RF System design in the engineering field, simulating high-frequency system to achieve the best performance of the system design. In the debugging process, we use vector network analyzer and digital logic analyzer systems, and other equipments on some strict tests to ensure the reliability of the system.The design of UHF RFID reader has the traits of steady-going, abundance of interfaces resource and so on. It is easy to make second development then be the same with special application system. Universal base band is very easy to connect to different RF system.更多还原