可见光定位系统中扩展LED ID的双频率或运算调制方法

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.