基于分数阶傅里叶变换的移动读写器多射频标签定位算法  

A Location Method for Multi-tags of RFID by a Movable Reader Based on FRFT

作　　者：潘勇[1,2] 刘开华[1] 于洁潇[1] 罗蓬[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072 [2]重庆三峡学院计算机科学与工程学院,重庆404000

出　　处：《南开大学学报（自然科学版）》2013年第5期73-79,共7页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：国家自然科学基金(60872001);天津市科技支撑计划重点项目(10ZCKFGX03600)

摘　　要：针对多个辐射宽带线性调频(LFM)信号的射频标签目标,通过分析接收信号的多普勒频移,建立针对工程应用背景的移动读写器上非均匀天线阵列对多分量LFM信号的接收模型,利用基于分数阶傅里叶变换谱峰搜索ESPRIT算法的定位算法,实现了非均匀天线阵列低信噪比下多目标的信号检测与方位角估计.仿真结果表明,该算法可以分辨多个频率及空间相近的目标源,且精度很高.Aiming at RFID （radio frequency identification） tag targets of wideband LFM （Linear Frequency Modulation） signals and the engineering application background, by analyz- ing the Doppler shift of received signals, a multi-component LFM signal model for the irregular antenna array on a movable reader was built. Then a method for RFID tag targets location based on the spectral peak searching ESPRIT algorithm in FRFT （fractional Fourier transform） domain was presented, which implements the signal detection and DOA （Direction of Arrival） estimation for the irregular antenna array in low SNR. Simulation results shows that RFID tag targets with similar frequency and close space can be distinguished in a high ac- curacy.

关 键 词：宽带LFM信号 DOA估计 RFID定位 ESPRIT 

分 类 号：TN911.72[电子电信—通信与信息系统]