为掌握可见光室内定位系统的无线信道特征,以提高室内定位系统的抗干扰性能,建立了室内可见光定位系统信号传输的信道模型及噪声模型。在设计的照明模型下,可见光反射损耗远大于视距传播的损耗,故信道传输函数可用直流增益函数表示。仿真结果表明,定位接收器接收到的定位信号信噪比大小与照明灯分布、定位光源光功率变化以及室内定位平面相对高度等参数有关。仿真计算结果表明,不同位置的光源所发信号接收时信噪比差异明显,因此定位中对定位光源的选择很重要,会直接影响定位系统的抗干扰性能,从而影响系统的定位精度。

In order to understand the characteristics of the wireless channel of a visible light indoor positioning system and to improve the anti-noise performance of the indoor positioning system,we establish a channel model and a noise model of the indoor visible light positioning system.Based on the illumination model described in the paper,the visible reflection loss is much greater than the loss of the sight.Therefore,the transfer function of the channel can be expressed by the direct current gain function.The simulation results show that the signal to noise ratio of the received signal is related to the distribution of the lamp,the light power of the positioning light source and the relative height of the indoor location.Calculation results show that the signal-to-noise ratio of the light source at different locations is different,so it is very important to choose a proper light source that will affect the accuracy of the positioning system.