SpotFi: Decimeter Level Localization Using WiFi
SpotFi: Decimeter Level Localization Using WiFi
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DOI：
10.1145/2829988.2787487
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发表时间：
2015-08-01
影响因子：
2.8
通讯作者：
Katti, Sachin
中科院分区：
文献类型：
--
作者：
Kotaru, Manikanta;Joshi, Kiran;Katti, Sachin
本文介绍了 SpotFi 的设计和实现，这是一种可以部署在商用 WiFi 基础设施上的精确室内定位系统。 SpotFi 仅使用 WiFi 芯片已经公开的信息，不需要任何硬件或固件更改，但仍能达到与最先进的定位系统相同的精度。 SpotFi 做出了两项关键技术贡献。首先，SpotFi 采用超分辨率算法，即使接入点 (AP) 只有三个天线，也可以准确计算多径分量的到达角 (AoA)。其次，它结合了新颖的过滤和估计技术，通过根据特定路径是直接路径的可能性为每条路径分配值来识别定位目标和 AP 之间的直接路径的 AoA。我们在多路径丰富的室内环境中进行的实验表明，SpotFi 的中位精度达到 40 厘米，并且对障碍物和多路径等室内障碍物具有鲁棒性。
This paper presents the design and implementation of SpotFi, an accurate indoor localization system that can be deployed on commodity WiFi infrastructure. SpotFi only uses information that is already exposed by WiFi chips and does not require any hardware or firmware changes, yet achieves the same accuracy as state-of-the-art localization systems. SpotFi makes two key technical contributions. First, SpotFi incorporates super-resolution algorithms that can accurately compute the angle of arrival (AoA) of multipath components even when the access point (AP) has only three antennas. Second, it incorporates novel filtering and estimation techniques to identify AoA of direct path between the localization target and AP by assigning values for each path depending on how likely the particular path is the direct path. Our experiments in a multipath rich indoor environment show that SpotFi achieves a median accuracy of 40 cm and is robust to indoor hindrances such as obstacles and multipath.