基于LED照明的室内定位技术研究

Research on Indoor Positioning Technology Based on LED Lighting

近年来室内定位技术成为研究的热点,通过当前常用室内定位技术的分析,讨论了各种技术的实施优缺点,提出了利用每个照明LED在不同位置照度分布不同,对照明LED分时高速调制,即不影响照明,又因每个LED灯珠所携带信息不同,照度相互作差法消除环境背景光干扰。以硅光电池为光电传感器,设计单片机系统,在整个定位区域采样光信号,使用K-Means聚类算法建立与坐标对应的多维数组;单片机系统完成测量点信号数字化后,利用最近邻域加权K(WKNN)算法确定测量点位置坐标。通过实际环境进行定位测试,其精度可以达到厘米量级。这种利用LED照明的室内定位技术设计成本低、结构简单,在室内定位领域有广泛应用前景。

Through the analysis of current indoor location technologies,the advantages and disadvantages of various technologies are discussed.By using each illumination LED in different locations of illumination distribution,the high speed modulation of the lighting LED,that is,does not affect the lighting,and the information carried by each LED lamp is different,and the illumination difference method is used to eliminate the ambient light interference.Using silicon photocell as a photoelectric sensor,a single chip microcomputer system is designed.A multi-dimensional array corresponding to the coordinates is established by using K-Means clustering algorithm in the whole location area.The location coordinates of the measurement point are determined by the Weight K-Nearest Neighbor(WKNN)algorithm after the single chip computer system completes the measurement point signal digitization.The accuracy of location test can reach centimeter order through actual environment.