基于Wi-Fi Direct的道路交通状态信息采集方法

Information Collection Method of Road Traffic State based on Wi-Fi Direct

针对传统交通状态信息采集中采用的环形线圈车辆检测器存在布设和维护难度较大等问题,提出了一种基于Wi-Fi Direct的道路交通状态信息采集方法,以实现对基本的道路交通流状态参数进行采集估计。该方法利用车-路通讯设备实现车辆与路侧设备的通信;以车载通讯设备的Wi-Fi芯片MAC地址完成车辆个体识别;通过车载通讯设备中的北斗定位装置向路侧设备提供车辆实时位置及时间信息,进而实现道路区段内交通流基本状态信息估计。实验测试表明,该方法能够有效完成路段平均速度、交通流量及车流密度等交通状态信息的采集和估计。

According to the existing problem of the traditional loop vehicle detector used in the collection of road traffic status information, such as great difficulty of the installation and maintenance, a method based on Wi--Fi Direct is proposed in the paper for collection of road traffic status information, which could collect and estimate basic state parameters of the road traffic flow. This method can realize the communication between vehicles and roadside equipments by the vehicle to road communication equipment, achieve the vehicle individual identification through MAC address of the Wi- Fi chip in vehicle communication equipment. This method can provide the vehicle＇s real time location and time information to roadside equipment though BDS of vehicle communication equipment, so as to realize the estimation of the basic traffic flow state information on the road section. The experimental test shows that the proposed method could effectively complete the collection and estimation of traffic state information, such as the average speed of road section, traffic flow and traffic density.