基于LED室内可见光的边界定位精度研究

Research on boundary location accuracy based on LED indoor visible light

为了改善可见光定位区域边界误差较大的问题,提出一种对定位区域边界点进行坐标修正的方法。该方法利用发光二极管作为信号源,根据三灯定位和相对照度测距圆重叠区重心估计原理,结合区域边界点坐标修正算法实现定位区域边界的高精度定位。边界定位过程主要分为两步:第一步,利用三灯定位和相对照度测距圆重叠区重心估计确定修正前定位坐标;第二步,以所在定位边界位置为区分,引入修正因子对不同边界位置坐标点进行修正得到修正后定位坐标。最后通过实测定位实验验证所提方案的有效性。结果显示,在2 m×2 m×2.3 m的室内定位空间中,使用边界坐标修正方案得到的综合平均定位误差为3.51 cm,该方法与未使用边界坐标修正方案相比在边界附近的平均定位误差降低了70.28%,有效降低了边界定位误差。

In order to solve the problem of large boundary error in visible light location region,a coordinate correction method for boundary points in the location region is proposed.This method uses light-emitting diode as signal source,according to the principle of three-lamp location and relative illuminance ranging circle overlapping center of gravity estimation,combined with the region boundary point coordinate correction algorithm to achieve high-precision location of the region boundary.The process of boundary location can be divided into two steps:first,the location coordinates before correction are determined by three-lamp location and relative illumination location.In the second step,according to the location of the boundary,correction factors are introduced to modify the coordinate points of different boundary positions to obtain the corrected positioning coordinates.Finally,the effectiveness of the proposed scheme is verified by practical positioning experiments.The results show that in the indoor positioning space of 2 m×2 m×2.3 m,the comprehensive average positioning error obtained by using the boundary coordinate correction scheme is 3.51 cm.Compared with the method without using the boundary coordinate correction scheme,the average positioning error near the boundary is reduced by 70.28%,effectively reducing the boundary positioning error.