基于声表面波(Surface acoustic wave, SAW)技术的传感器标签具有体积小、灵敏度高、抗干扰能力强、可实现无源无线通信等特点，适合在恶劣环境下工作，用于实现射频识别(Radio frequency identification, RFID)和温度检测时具有一定的优势。针对特殊环境下的多点测温需求，论文在充分调研和分析的基础上，设计并实现了声表面波传感器标签识别与温度检测系统，重点研究了系统回波信号相位提取算法问题及SAW传感器标签识别问题 首先，本论文分析了延迟线型 SAW传感器的主要结构特点以及标签识别、温度检测的基本工作原理，并在此基础上对传感器的回波信号模型进行了理论分析，分析表明通过对回波信号的相位信息进行提取可以实现SAW传感器的标签识别与温度检测。 其次，介绍了常见的几种相位提取和频率检测的方法，分析了各自的优缺点，并针对相位模糊问题提出了相位和频率联合估计算法。同时，介绍了SAW传感器标签识别的常见编码方式，在充分考虑系统所使用SAW传感器结构特点的基础上，确定了具体的编码和解码方案。 再次，调研和论证了系统的功能需求和技术指标，确定了标签识别和温度检测系统的工作机制及总体设计方案，在此基础上叙述了SAW阅读器硬件结构的设计实现。 最后对系统进行了调试与测试，总结和分析了标签识别与温度检测的测试结果，表明系统设计达到了预期的功能需求和技术指标，同时也对系统的进一步完善提出了改进方向和可行性建议。

Sensors based on surface acoustic wave (SAW) techniques have the characteristics of small size, high reliability, immunity to electromagnetic interference, passive wireless communication and high robustness against environmental, which make them superior to other techniques when used in a radio frequency identification (RFID) and temperature detection system. For the multi-point temperature detection needs of these extremely environment and on the basis of abundant investigation and analysis, this paper designed the tag identification and temperature measurement system based on SAW sensor. The paper focuses on the echo signal phase extraction algorithm and SAW sensor tag identification problem. Firstly, this paper analyses the main structure and the basic principles of tag identification and temperature detecting of SAW sensor based on delay line, and through the theoretical analysis of echo signal of SAW sensor, it indicates that the precise extraction of phase information of echo signal contributes to tag identification and temperature measurement of SAW sensor. Secondly, this article introduces several common phase and frequency measurement method, and the analysis of its own advantages and disadvantages, and proposed the algorithm of phase and frequency joint estimation for phase ambiguity phase which can resolve phase ambiguity. At the same time, paper has presented the common used coding scheme of SAW sensor tag identification, and has designed the specific encoding and decoding scheme based on full consideration of the SAW sensor structural features used in system. Furthermore, this paper has a research and demonstration of the system's functional requirements and technical specifications to determine the working mechanism and overall design labels of tag identification and temperature detection system, based on this the hardware architecture of SAW Reader has been designed. Finally, the system has been debugged and tested, the test result shows that the expected functional requirements and technical specifications of the system are fully achieved, in the meantime, some suggestions have also been put forward for further improvement.