在可见光定位系统中,接收端需要捕获来自不同参考光源的可见光信号,进而根据参考光源的位置信息和预设的可见光定位算法估计接收端的位置坐标。上述定位过程中,通常假设光源为朗伯型光源,即光源的光波束符合朗伯规律。为了实现特定照明效果,固态光源厂商经常通过改进分装工艺、加装二次光学透镜等方式对光波束进行再次塑造,以获得多样化的空间光波束。为了量化评估实际非朗伯光波束对可见光定位系统的影响,将3种商用非朗伯光波束EdiPower Emitter、LUXEON Rebel、Side Emitter引入典型室内场景。量化结果表明,相比传统朗伯光波束配置,非朗伯光波束引入的最大定位误差和均值定位误差分别为101.7 cm和48.8 cm。考虑到商用非朗伯光波束辐射功率未归一化的影响,上述定位误差会进一步增大。

In visible light positioning system, the receiver needs to capture the visible light signals from different reference optical sources, and then the position coordinates of the receiver are estimated based on the position information of the reference light source and the preset visible light positioning algorithm. In the above positioning process, it is usually assumed that the light source is a Lambertian light source, that is, the light beam of the light source conforms to the Lambertian law. In order to achieve specific lighting effects, solid-state light source manufacturers often reshape the light beams by improving the subassembly process and adding secondary optical lenses to obtain diversified spatial light beams. In order to quantify the impact of actual non-Lambertian beams on the visible light positioning system, three commercial non-Lambertian beams, EdiPower Emitter, LUXEON Rebel, and Side Emitter are introduced into typical indoor scenes. The quantitative results show that, compared with the traditional Lambertian beam configuration, the maximum positioning error and the average positioning error introduced by the non-Lambertian beam are 101.7 cm and 48.8 cm, respectively. Taking into account the influence of the non-normalized radiation power of commercial non-Lambertian beams, the above positioning error will be further increased.