Relative Localization of RFID Tags using Spatial-Temporal Phase Profiling
Relative Localization of RFID Tags using Spatial-Temporal Phase Profiling
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2015-05
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通讯作者：
Longfei Shangguan;Zheng Yang;Alex X. Liu;Zimu Zhou;Yunhao Liu
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作者：
Longfei Shangguan;Zheng Yang;Alex X. Liu;Zimu Zhou;Yunhao Liu
许多对象定位应用需要一组对象的相对位置，而不是它们的绝对位置。虽然已经提出了许多使用射频识别（RFID）标签的目标定位方案，但是它们大多集中于绝对目标定位，并且由于它们需要大的误差容限和特殊的硬件而不适合于相对目标定位。在本文中，我们提出了一种称为时空相位轮廓（STPP）的RFID的相对目标定位的方法。STPP的基本思想是通过在一组标签上移动读取器，在此期间读取器连续询问标签，对于每个标签，读取器从标签随时间的响应中获得RF相位值的序列，我们称之为相位分布。通过分析相位分布的时空动态性，STPP可以计算标签之间的空间排序。与现有的绝对目标定位方案相比，STPP既不需要专用的基础设施，也不需要特殊的硬件。我们实现了STPP，并评估了其性能在两个现实世界中的应用：在图书馆中定位错位的书籍，并确定在机场的行李顺序。实验结果表明，STPP实现了约84%的错位图书和95%的行李处理的订购准确率。
Many object localization applications need the relative locations of a set of objects as oppose to their absolute locations. Although many schemes for object localization using Radio Frequency Identification (RFID) tags have been proposed, they mostly focus on absolute object localization and are not suitable for relative object localization because of large error margins and the special hardware that they require. In this paper, we propose an approach called Spatial-Temporal Phase Profiling (STPP) to RFID based relative object localization. The basic idea of STPP is that by moving a reader over a set of tags during which the reader continuously interrogating the tags, for each tag, the reader obtains a sequence of RF phase values, which we call a phase profile, from the tag's responses over time. By analyzing the spatial-temporal dynamics in the phase profiles, STPP can calculate the spatial ordering among the tags. In comparison with prior absolute object localization schemes, STPP requires neither dedicated infrastructure nor special hardware. We implemented STPP and evaluated its performance in two real-world applications: locating misplaced books in a library and determining baggage order in an airport. The experimental results show that STPP achieves about 84% ordering accuracy for misplaced books and 95% ordering accuracy for baggage handling.