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为了减小室内可见光定位中存在的噪声和时延对定位精度的影响,提出了一种室内发光二极管(LED)可见光定位算法。引入蜂窝拓扑结构进行可见光室内定位,自适应选取LED信标节点。研究噪声对接收光功率的影响,采用均值模型对接收光功率进行校正。传统的可见光时分复用定位系统时延过长,易出现时钟同步错误。为满足高精度实时定位,采用改进的时分复用组网系统。通过小区划分,选取网络源中心节点;通过竞争申请时隙段,重复利用部分时隙段,解决了帧长与LED节点数量的矛盾。仿真结果表明,该算法可以有效减小目标移动和时钟同步错误对定位精度的影响,提高了室内定位系统的实时性与稳健性。
In order to reduce the influence of noise and delay in indoor visible light positioning on the positioning accuracy, an indoor LED positioning algorithm is proposed. The cellular topology is introduced for visible indoor positioning and the LED beacon node is adaptively selected. The influence of noise on the received optical power is studied, and the mean value model is used to correct the received optical power. Traditional visible light time-division multiplexing positioning system delay is too long, prone to clock synchronization error. To meet the high-precision real-time positioning, the use of improved time division multiplexing networking system. Through cell division, select the network source center node; through the competition for the application of the time slot segment, reuse some of the time slot segment, the frame length and the number of LED nodes to solve the conflict. The simulation results show that the proposed algorithm can effectively reduce the impact of target movement and clock synchronization errors on the positioning accuracy and improve the real-time performance and robustness of the indoor positioning system.