摘要
研究了一种用于超高频RFID定位的相位式测距方法,针对超高频载波信号在相位提取过程中会出现整周相位模糊的问题,采取了单频副载波调幅的解决方法。通过离散频谱校正技术得到副载波信号收发相位之差,从而获取阅读器与标签之间的距离信息,然后采用最小二乘法实现对标签的定位。仿真结果表明,离散频谱校正的方法能够保证相位估计的精度,证明了本方案的有效性和稳定性。
A phase difference ranging method in UHF RFID positioning is presented. Aiming at the problem of phase fuzzy of the carrier signal, single subcarrier AM modulation is introduced. The distance between reader and tag can be obtained by measuring the phase difference of received signal and transmitted suhcarrier signal, and the phase difference is measured by using discrete spectrum correction algorithms, then the least squares is used to get the localization of tag. Experimental results show that accurate phase values can be esti- mated through discrete spectrum correction and the proposed method is proved to be efficient and stable.
出处
《单片机与嵌入式系统应用》
2014年第5期36-38,42,共4页
Microcontrollers & Embedded Systems
关键词
相位式测距
射频识别
离散频谱校正
phase difference ranging
radio frequency identification
discrete spectrum correction
