基于LED半功率角的VLC混合室内定位算法研究

摘要

A VLC hybrid indoor location algorithm based on the characteristic of the semi angle at half power (SAHP) of LED is proposed.The algorithm uses the SAHP-RSS algorithm for positioning in the coverage of the LED SAHP because of the large signal intensity,good channel condition and the small path loss,or uses the AOAD algorithm to locate outside the coverage of the LED SAHP because of the small signal intensity and poor channel condition.It has little effect on the intensity of the optical signal and can achieve accurate positioning of indoor three-dimensional space with only two LED sources by the AOAD algorithm.Finally,the Kalman filter is used to eliminate the error of the positioning algorithm by the Matlab simulation,and the positioning error is reduced to 2 cm.The VLC hybrid indoor positioning algorithm based on LED SAHP has low complexity,high positioning accuracy and simple realization.%提出一种基于LED半功率角的VLC混合室内定位算法,该算法结合LED半功率角特点,在LED半功率角覆盖范围内时,光信号强度大、信道条件好,信号受到的路径损耗影响小,使用半功率角RSS算法进行定位;在LED半功率角覆盖范围外时,光信号强度小、信道条件差,提出到达角差值算法进行定位,该算法受光信号强度值大小的影响小,且只需2个LED信源可实现室内三维空间定位.最后,使用Matlab仿真,并利用卡尔曼滤波消除算法定位误差,将定位误差减小到2 cm.基于LED半功率角的VLC混合室内定位算法复杂度低、定位精度高,且实现简单.