基于RFID相位测量方法影响因素分析

Analysis of influencing factors based on RFID phase measurement method

在室内环境下,利用无线电射频（RFID）技术,采用相位差的定位方法对标签实施定位可得到较高精度。但是,在通用定位系统中,当前研究缺乏针对频率、温度、物理器件的硬件特性、标签的耦合效应以及旋转角度等因素对标签相位测量精度影响的分析。为了提高该方法的适用性,利用英频杰R420阅读器、Laird S9028PCL天线、超高频无源标签搭建了通用定位系统,针对这些因素设计相关实验。定量结果表明,标签旋转方向和耦合效应是影响相位测量精度的主要因素,其中不同类型的标签绕不同坐标轴旋转时,相位变化规律不同,而耦合效应在两标签距离小于40cm时对相位值的测量相对影响较大。

It has achieved higher accuracy to locate tag based on the phase difference method using RFID technology in indoor environment.However,in general positioning system,the current research in view of the lack of analyzing the factors on the label phase measuring accuracy that is temperature,physical properties of hardware devices,coupling effect and rotation angle.In order to improve the applicability of this method,a universal positioning system was built by using R420 reader,Laird S9028 PCL antenna and UHF passive tag,and relevant experiments were designed for these factors.The results show that the tag rotation direction and the coupling effect is the main factor affecting the precision of the phase measurement,in which different types of tags rotated around different coordinate axes,the phase variation is different,and the coupling effect has a great influence on the phase measurement when the distance between the two tags is less than 40 cm.