摘要
针对复杂室内环境非接触式RFID目标定位误差大的问题,提出了RFreeTrack系统,其使用商用RFID设备计算出目标反射信号,实现了复杂环境下高精度非接触式目标定位。首先,提出了一种基于时间序列相似度的搜索方法用于校准静态信号,从而显著增强了目标反射信号提取的鲁棒性。然后,提出了基于差分相位全息图的非接触式定位方法,排除阅读器天线位置的影响,提升了定位准确度,降低了系统的部署难度。最后,实现了一个高精度的非接触式定位系统原型。实验表明,在复杂环境中使用校准后的静态信号提取出的目标反射信号相位,相较于现有方法误差降低了68.8%。基于校准过的静态反射信号,在复杂环境中使用差分相位全息图的定位误差平均值为0.040 8 m,相较于现有方法提升了50.6%。
To address the issue of large positioning errors in complex environments within non-contact RFID-based positioning systems,RFreeTrack system was proposed.Commercial RFID equipment was used to calculate the reflected signals from targets,achieving high-precision non-contact positioning in complex environment.Firstly,a search method based on time-series similarity was proposed to employ for calibrating static signals,thus significantly enhanced the robustness of target reflection signal extraction.Secondly,a non-contact positioning method based on differential phase holography was introduced to eliminate the influence of the reader antenna’s position,thus the accuracy of positioning was improved and the complexity of system was deployment reduced as well.Finally,a high-precision non-contact positioning system prototype was realized.Experimental results indicate that in complex environments,the phase of the target reflection signals extracted using the calibrated static signals has a 68.8%lower error compared to existing methods.Based on the previously calibrated static reflection signals,the average positioning error using differential phase holography in complex environments is 0.0408 m,and has a 50.6%improvement on location over existing methods.
作者
桂林卿
蒋祎
张卿云
肖甫
GUI Linqing;JIANG Yi;ZHANG Qingyun;XIAO Fu(School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks,Nanjing 210023,China)
出处
《通信学报》
EI
CSCD
北大核心
2024年第3期92-103,共12页
Journal on Communications
基金
国家杰出青年科学基金资助项目(No.62125203)
国家自然科学基金资助项目(No.61932013,No.62372246)。
关键词
射频识别
室内定位
非接触式定位
静态信号校准
差分相位全息图
RFID
indoor localization
non-contact localization
static signal calibration
differential phase hologram
