Indoor Wi-Fi Localization Method Based on Carrier Phase Difference

被引：0
|
作者：
He W. [1 ]
Yue Z.-Y. [1 ]
Zhou M. [1 ]
Tian Z.-S. [1 ]
机构：
[1] School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing
来源：
Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications | 2021年 / 44卷 / 04期
关键词：
Carrier phase information; Indoor localization; Integer ambiguity; Virtual baseline constraint; Wi-Fi;
D O I：
10.13190/j.jbupt.2020-253
中图分类号：
学科分类号：
摘要：
Due to the low angular resolution of angle of arrival (AoA), it is challenging for the AoA localization algorithm based on channel state information (CSI) to achieve sub-meter level localization accuracy. To improve the localization accuracy, a precise indoor Wi-Fi localization method based on carrier phase difference is proposed. First, the center frequency carrier phase of CSI and time of flight in line of sight path are extracted, and the carrier phase difference localization model is constructed with virtual reference point, thus achieving the initial target localization.Then, combining the initial localization result of the target, the integer ambiguity solution is realized by using the virtual baseline constraint. Finally, the carrier phase localization optimization algorithm based on the extended Kalman filter is proposed to obtain the precise location of the target. Experimental results for straight lines and arbitrary paths show that the median localization error of the proposed method is within 0.25 m, which is more accurate and reliable than the baseline method. © 2021, Editorial Department of Journal of Beijing University of Posts and Telecommunications. All right reserved.
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页码：19 / 25
页数：6
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