A Handheld Fine-Grained RFID Localization System with Complex-Controlled Polarization
A Handheld Fine-Grained RFID Localization System with Complex-Controlled Polarization
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DOI：
10.1145/3570361.3592504
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
L. Dodds;I. Perper;A. Eid;Fadel M. Adib
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文献类型：
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作者：
L. Dodds;I. Perper;A. Eid;Fadel M. Adib
有很多兴趣在细粒度的RFID定位系统。用于精确定位的现有系统通常需要基础设施，其形式为广泛的参考标签或许多天线（例如，天线阵列）以将RFID标签定位在它们的无线电范围内。然而，仍然需要具有紧凑、便携、移动的形式的细粒度RFID定位解决方案，当用户在诸如零售商店、仓库或制造工厂中的区域周围走动时，用户可以手持该解决方案以对其进行映射。我们提出的设计，实施和评估的POLAR，一个便携式手持系统的细粒度RFID定位。我们的设计引入了两个关键的创新，使RFID标签的鲁棒，准确和实时定位。第一种是复合控制极化（CCP），这是一种通过两个线性极化天线的软件控制极化在所有方向上定位RFID的机制。第二种是联合标签发现和定位（JTDL），一种用于同时定位和阅读标签的方法，无论标签方向如何，都具有零开销。在这两种技术的基础上，我们开发了一个端到端的手持系统，解决了一些实际的挑战，在自我干扰，有效的清点，和自我定位。我们的评估表明，POLAR在实际的室内环境中，在每个x/y/z维度上实现了几厘米的中值精度。
There is much interest in fine-grained RFID localization systems. Existing systems for accurate localization typically require infrastructure, either in the form of extensive reference tags or many antennas (e.g., antenna arrays) to localize RFID tags within their radio range. Yet, there remains a need for fine-grained RFID localization solutions that are in a compact, portable, mobile form, that can be held by users as they walk around areas to map them, such as in retail stores, warehouses, or manufacturing plants. We present the design, implementation, and evaluation of POLAR, a portable handheld system for fine-grained RFID localization. Our design introduces two key innovations that enable robust, accurate, and real-time localization of RFID tags. The first is complex-controlled polarization (CCP), a mechanism for localizing RFIDs at all orientations through software-controlled polarization of two linearly polarized antennas. The second is joint tag discovery and localization (JTDL), a method for simultaneously localizing and reading tags with zero-overhead regardless of tag orientation. Building on these two techniques, we develop an end-to-end handheld system that addresses a number of practical challenges in self-interference, efficient inventorying, and self-localization. Our evaluation demonstrates that POLAR achieves a median accuracy of a few centimeters in each of the x/y/z dimensions in practical indoor environments.