双频副载波调幅的UHF RFID定位研究  

UHF RFID location algorithm based on dual frequency subcarriers amplitude modulation

作　　者：史伟光[1] 刘开华[1] 房静静[1] 罗蓬[1] 于洁潇[1] 黄翔东[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《哈尔滨工业大学学报》2012年第3期81-86,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(60872001)

摘　　要：针对多径效应及非视距阻挡使得基于收信强度的室内定位系统精度难以进一步提高的问题,提出了一种适于915 MHZ射频识别定位算法,以收发信号的相位差作为定位依据,引入双频副载波克服整周期模糊度并降低采样率要求,结合全相位FFT谱分析特性,提出一种基于欠采样条件下的相位差估计方法并获取测距信息,利用最小二乘法求解定位标签位置.仿真结果表明,该算法具有良好的定位准确度及稳定性.For the accuracy of indoor location system based on the strength of received signal being restricted by the multipath effect and non line of sight propagation,a location algorithm using radio frequency identification was proposed which was suitable for 915 MHZ UHF signal.Dual frequency subcarriers were introduced to overcome the ambiguity of whole cycles and reduce the demands of sample rate.On the basis of spectrum analysis of All-Phase FFT,a mechanism was put forward to estimate the phase difference so as to achieve the ranging information with under-sampling,and then the position of the tracking tags could be obtained by the least square method.Simulation results show that,the proposed algorithm possesses a higher accuracy and stability.

关 键 词：射频识别技术 室内定位 双频副载波调幅 相位差 

分 类 号：TN925.93[电子电信—通信与信息系统]