Positioning Using Visible Light Communications: A Perspective Arcs Approach
Positioning Using Visible Light Communications: A Perspective Arcs Approach
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DOI：
10.1109/twc.2023.3247458
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发表时间：
2022-04
影响因子：
10.4
通讯作者：
Zhiyu Zhu;Caili Guo;Rongzhen Bao;Mingzhe Chen;W. Saad;Yang Yang-Yang
中科院分区：
文献类型：
--
作者：
Zhiyu Zhu;Caili Guo;Rongzhen Bao;Mingzhe Chen;W. Saad;Yang Yang-Yang
可见光定位（VLP）是一种使用灯具作为发射器的精确室内定位技术。特别地，圆形照明器是VLP的常见源类型，其通常仅被视为用于定位的点源，而忽略其几何特征。本文将圆形灯具的圆弧特征和通过可见光通信（VLC）获得的坐标信息联合用于定位，提出了一种新的基于VLC的室内定位方法--透视圆弧法。所提出的方法不依赖于任何惯性测量单元，并且在用户处没有倾斜角度限制。首先，VLC辅助透视圆和弧算法（V-PCA）提出了一个场景中，一个完整的灯具和一个不完整的一个可以被用户捕获。基于平面和立体几何理论，利用灯具和用户之间的关系来估计灯具在摄像机坐标系中的方位和坐标。然后，通过单视图几何理论得到用户在世界坐标系中的姿态和位置。针对部分VLC链路被遮挡的情况，提出了一种抗遮挡VLC辅助透视弧算法（OA-V-PA）。在OA-V-PA中，开发了一种近似方法来估计照明器中心在图像上的投影，然后计算用户的姿势和位置。仿真结果表明，所提出的室内定位算法可以达到10 cm左右的90%定位精度。最后，实现了一个实验样机，验证了该方法的可行性.在建立的原型中，提出了一种融合图像处理方法，同时获得VLC信息和几何信息。实验结果表明，在不同的倾斜角度下，系统的平均定位精度小于5cm。
Visible light positioning (VLP) is an accurate indoor positioning technology that uses luminaires as transmitters. In particular, circular luminaires are a common source type for VLP, which are typically treated only as point sources for positioning, while ignoring their geometry characteristics. In this paper, the arc feature of the circular luminaire and the coordinate information obtained via visible light communication (VLC) are jointly used for positioning, and a novel perspective arcs approach is proposed for VLC-enabled indoor positioning. The proposed approach does not rely on any inertial measurement unit and has no tilted angle limitation at the user. First, a VLC assisted perspective circle and arc algorithm (V-PCA) is proposed for a scenario in which a complete luminaire and an incomplete one can be captured by the user. Based on plane and solid geometry theory, the relationship between the luminaire and the user is exploited to estimate the orientation and the coordinate of the luminaire in the camera coordinate system. Then, the pose and location of the user in the world coordinate system are obtained by single-view geometry theory. Considering the cases in which parts of VLC links are blocked, an anti-occlusion VLC assisted perspective arcs algorithm (OA-V-PA) is proposed. In OA-V-PA, an approximation method is developed to estimate the projection of the luminaire’s center on the image and, then, to calculate the pose and location of the user. Simulation results show that the proposed indoor positioning algorithm can achieve a 90th percentile positioning accuracy of around 10 cm. Moreover, an experimental prototype is implemented to verify the feasibility. In the established prototype, a fused image processing method is proposed to simultaneously obtain the VLC information and the geometric information. Experimental results in the established prototype show that the average positioning accuracy is less than 5 cm for different tilted angles of the user.