基于地磁场探测的车辆监测系统

Vehicle detecting system based on geomagnetic field measurement

介绍了各向异性磁阻(AMR)传感器探测系统的检测电路的实现与数据信息处理方法。这种利用车辆通过道路时对地球磁场的影响来完成车辆检测的数据采集系统具有常规线圈检测器所不具备的优点,在智能交通系统(ITS)的信息采集中必将起着非常重要的作用。给出真实公路环境中对行驶中车辆探测的实验结果,实测效果直观明显,探测灵敏度达到2mV/V/Oe,线性度误差达到0.05%FS。

Detecting circuit realization and data information processing method of anisotropic magnetoresistive （AMR）vehicle detecting system are presented. With measuring variations of the geomagnetic field, AMR sensor can detect the presence and driving direction of vehicle and display the disturbance of the geomagnetic field on a computer screen. Experimental results show system is highly sensitive to geomagnetic field disturbance with 2 mV/ V/Oe sensitivity and 0.05 % FS linearity error.