基于频率步进原理的声表面波射频标签的辨识  

Identification of Surface Acoustic Wave RFID Based on Frequency Stepped Continuous Wave

作　　者：周恮 李庆亮[1] 韩韬[1] 吉小军[1] 施文康[1] 

机构地区：[1]上海交通大学电子信息学院信息检测与仪器系,上海200030

出　　处：《压电与声光》2007年第2期132-134,共3页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(10304012)

摘　　要：为降低声表面波(SAW)射频标签(RFID)系统对硬件模数转换器和天线开关速度及隔离度的要求,提出了频率步进原理声表面波射频标签的辨识。采用基于自回归模型的功率谱估计方法对回波信号进行了时频变换,通过对加入了噪声的系统回波信号进行仿真实验,验证了发射频率步进脉冲信号取代传统窄脉冲的可行性以及算法的高精度。同时也讨论了阅读器与标签之间不同距离、温度影响和相位噪声对标签解码的影响,提出了解决思路。In order to reduce the requirements of the speed of analog-to-digital conversion, the antenna switch isolation and speed in surface acoustic waves （SAW） based radio frequency identification （RFID） system, an approach based on frequency stepped continuous wave （FSCW） is proposed. By using the power spectral estimation based on auto-regressive model, the time-frequency transformation of the reflection signal is implemented. The simulation validates the feasibility of emitting FSCW signal instead of traditional narrowband impulse and the higher precision of the algorithm. In addition, some factors such as Doppler Effect, temperature and reflection phase from each reflector, which can influence the precision of spectral estimation are discussed.

关 键 词：声表面波 射频标签 频率步进 自回归模型 功率谱估计 

分 类 号：TH7[机械工程—仪器科学与技术]