可见光定位系统中扩展LED ID的双频率或运算调制方法

Dual frequency or arithmetic modulation method for expanding LED ID in visible light positioning system

随着可见光通信的发展,室内可见光定位技术获得了广泛的关注。在以图像传感器为接收终端的见光定位系统中,针对单频率调制ID方案简单易实施,但受限于接收终端采集频率上限,可提供ID数量过少,难以满足实际较大面积场景的应用需要。提出了一种扩展ID方法,将两个不同频率的方波进行或运算,输出信号加载到驱动端作为LED ID标识。采用普通商用手机开展了实验研究,结果表明,与使用单一以频率作为LED ID相比,在本系统中可提供ID数量增加了6倍以上,可提供153种ID,且实验中识别ID准确率100%,在LED灯具被遮挡的面积达到1/3时,仍能正确识别出ID。

Due to the development of visible light communication, indoor visible light positioning technology has received extensive attention.In the visible light positioning system based on the image sensor, single frequency modulation ID scheme is simple and easy to implement. However, it is limited by the upper limit of the collection frequency of the terminal, and the number of IDs that can be provided is too small, which is difficult to meet the application requirements of the actual larger area scene. For the scenario where hundreds of IDs need to be provided, the result of OR operation of two square waves with different frequencies is proposed as the LED ID. Using ordinary commercial mobile phones to carry out experimental research. The results show that, compared with the use of a single frequency as the LED ID, the number of IDs that can be provided in this system has increased by 600%, 153 types of IDs can be provided, the identification ID accuracy rate is 100%, when the area of the LED lamp being blocked reaches 1/3, the ID can still be correctly identified.