基于磁阻传感器的无线车辆检测器  

Design of wireless vehicle detector based on AMR sensor

作　　者：赵中琦 陈永锐 易卫东 

机构地区：[1]中科院研究生院电子与通信学院,北京100049

出　　处：《电子测量技术》2013年第1期1-7,共7页Electronic Measurement Technology

摘　　要：移动车辆能够引起地磁场的扰动,由4个磁动电阻组成的各向异性磁阻传感器可以感测到这种扰动。应用超低功耗各向异性磁阻传感器提出了一种适应于停车场环境的无线车辆检测器。该系统应用无线传感技术和停车状态检测算法,实现了对车辆的精确感知以及对停车位状态的准确判断。实验结果表明:移动车辆产生的磁信号可以由检测器感测到,并且信号特性根据检测器与车辆的相对位置以及车辆的类型而有所差异。设计的停车算法能够准确有效地判断出停车位状态。Composed of four magneto resistors, anisotropic magneto-resistive （AMR） sensor is able to sense the disturbance of the magnetic field of earth caused by a moving vehicle, which can produces significant signals to be utilized. This paper proposes a wireless vehicle detector system, which consists of a low power AMR sensor implemented in the parking lots. In the system, wireless sensor technology and vehicle detecting algorithms are employed to detect the status of vehicle parking lots. Experimental results demonstrate that the different status in the magnetic field caused by moving vehicles can be detected by the AMR magnetic sensor. The analyses of the experimental results show that the outputs of the detector are highly correlated with the vehicle type and the relative positions between the detector and the vehicle. As a result,the proposed algorithms can accurately and efficiently detect the state of the parking lot.

关 键 词：各向异性磁阻传感器 无线车辆检测器 停车位检测算法 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]