Beijing Advanced Innovation Center for Future Internet Technology, Beijing University of Technology, Beijing 100124, China.
Beijing Engineering Research Center For IoT Software and Systems, Beijing University of Technology, Beijing 100124, China.
Sci Rep. 2017 Mar 15;7:44183. doi: 10.1038/srep44183.
In RFID systems, how to detect the position precisely is an important and challenging research topic. In this paper, we propose a range-free 2D tag localization method based on phased array antenna, called PATL. This method takes advantage of the adjustable radiation angle of the phased array antenna to scan the surveillance region in turns. By using the statistics of the tags' number in different antenna beam directions, a weighting algorithm is used to calculate the position of the tag. This method can be applied to real-time location of multiple targets without usage of any reference tags or additional readers. Additionally, we present an optimized weighting method based on RSSI to increase the locating accuracy. We use a Commercial Off-the-Shelf (COTS) UHF RFID reader which is integrated with a phased array antenna to evaluate our method. The experiment results from an indoor office environment demonstrate the average distance error of PATL is about 21 cm and the optimized approach achieves an accuracy of 13 cm. This novel 2D localization scheme is a simple, yet promising, solution that is especially applicable to the smart shelf visualized management in storage or retail area.
在 RFID 系统中，如何精确地检测位置是一个重要且具有挑战性的研究课题。在本文中，我们提出了一种基于相控阵天线的无距离 2D 标签定位方法，称为 PATL。该方法利用相控阵天线的可调辐射角度依次扫描监控区域。通过使用标签在不同天线波束方向上的数量统计，使用加权算法计算标签的位置。该方法可应用于多个目标的实时定位，无需使用任何参考标签或额外的读取器。此外，我们提出了一种基于 RSSI 的优化加权方法来提高定位精度。我们使用集成了相控阵天线的商用现成 (COTS) UHF RFID 读取器来评估我们的方法。来自室内办公环境的实验结果表明，PATL 的平均距离误差约为 21cm，优化方法的精度达到 13cm。这种新颖的 2D 定位方案是一种简单而有前途的解决方案，特别适用于存储或零售区域的智能货架可视化管理。
