Vehicle-to-vehicle (V2V) positioning is an essential research for the security of autonomous vehicles. Due to low cost and easy accessibility, global positioning system (GPS) has been a popular solution.
However, GPS has inadequate accuracy due to the signal blockage by buildings and multipath effect. Besides GPS, RADAR and LIDAR can achieve quite high accuracy, but they also suffer from a high cost. Recently, visible light communication (VLC) based positioning scheme is becoming an alternative due to its advantages in low cost, immunity to electromagnetic interference and low power consumption.
The visible light communication-based positioning method is able to provide three functionalities of illumination, communication and positioning. The structure of the VLC system is composed of transmitter and receiver. It uses light emitting diodes (LEDs) as the transmitter which can transmit the information for communication and positioning. Meanwhile, the camera is placed on each car as the receiver. And there is a CPU (central processing unit) on the estimating vehicle to process and decode the signal. Thus, VLC based positioning scheme can be utilized to measure the distance between the estimating vehicle and the target vehicle.