【摘要】 为了缓解城市交通拥堵、提高道路通行能力,设计了一个基于磁阻传感器的车流量检测系统,磁阻传感器能将车辆引起的地磁扰动转换为清晰的电压信号输出.该系统包含了信号放大模块、无线通信模块、A/D转换模块、传感器置位/复位模块等,多个地磁传感器节点通过无线通信模块与计算机系统相连,将检测到的车流信息反馈到上位机,从而实现对整个路口车流的检测.采用改进后的多中间状态机算法,有效避免由于干扰造成的误判.实验表明:该系统具有较高的检测精度,能够实时、准确检测车流量信息.更多还原

【Abstract】 In order to ease urban traffic congestion and improve the capacity of roads,a traffic flow detection system is designed based on magnetoresistive sensor,which enables to convert the geomagnetic disturbance caused by the vehicle to a clear voltage signal.The system contains different functional modules including signal amplification,wireless communication,A/D converter and sensor set/reset functions et al..For the detection of all the intersection traffic,a number of geomagnetic sensors are connected to the computer system through the wireless communication module,and then,the detected traffic information is transferred back to the master host computer.In this paper,an improved multiple intermediate state matching algorithm is proposed,which efficiently avoid the misjudgment of the traffic due to the interference.The experiment shows that the system has a high grade of accuracy for detection.It is able to accurately detect the traffic flow in real time.更多还原