Abstract: According to the low positioning precision and high cost of traditional vehicle positioning technologies, and combining with advantages of the newly arisen visible light communication like no extra transmitter needed, no electromagnetic interference and free license, this paper proposes a vehicle positioning method based on traffic light, which can generate the vehicle’s position with the time difference of arrival of the signal light. Also its improved methods based on plan revolution theory are discussed to overcome the deficient in non-coplanar condition and improve the positioning precision. Simulation results show that these methods, with simple computation and low implementation cost, can realize a real-time high-precision positioning performance, and can meet the requirements of the intelligence transportation system.

Key words: vehicle positioning, traffic light, Time Difference of Arrival（TDOA）, visible light communication

摘要： 针对现有车辆定位技术定位精度低、成本高等缺陷和不足，结合可见光通信技术无需安装额外信号源、无电磁干扰、无频谱许可等优点，提出了一种基于交通灯的信号到达时间差（Time Difference of Arrival，TDOA）车辆定位技术。该定位技术利用交通灯作为定位信号源，根据可见光信号到达接收机的时间差确定车辆的位置，并利用平面旋转方法解决了交通灯与接收机的非共面问题，从而提高了车辆的定位精度。实验结果表明，该技术计算简单、实现成本低，可以实现较高精度的实时定位，满足智能交通系统对车辆定位的要求。

关键词: 车辆定位, 交通灯, 信号到达时间差（TDOA）, 可见光通信