摘要
针对日益突出的城市"停车难"问题,以及停车位检测需求的日益提高,提出了一种基于各向异性磁阻传感器(AMR)MMC21xMG的城市车位监测系统设计方案。该方案基于车位上车辆的存在会影响车位周边地磁场分布情况的原理,选用高灵敏度的各向异性磁阻传感器MMC21xMG,并结合无线技术,实时、高精度地检测地磁场的变化。详细给出了系统的硬件和软件设计,系统硬件包括检测模块、通信模块及后台服务器,软件包括检测程序、通信程序以及服务器处理程序。测试了不同环境下系统的输出数据,并结合所得的多组数据提出了判断车位上是否存在车辆的阈值算法。最后,使用该算法进行了实地的系统演示。应用结果表明,检测准确率达到95%以上。研究结果表明,该系统可行、高效,且实现成本低,适用范围广,可以被广泛采用。
Aiming at the growing problem of ＂difficult parking＂ and the increasing demand for the parking spaces testing in the city,a parking spaces monitoring system based on the anisotropic magnetoresistive（AMR） sensors MMC21xMG was designed.The program was based on the principle that the vehicles on the parking spaces affect the distribution of the magnetic field surrounding.Combined with wireless technology,the high sensitivity anisotropic magnetoresistive sensors MMC21xMG was chosen to detect changes in the geomagnetic field accurately in real time.The design of the hardware and software was given in detail.The hardware of the system was consisted of detection module,communication module and the server,the software of the system was consisted of testing program,communication program,and server program.The output of the system under different environmental were tested and a threshold algorithm was presented to determine whether there were vehicles based on the multiple sets of data obtained.Using the algorithm,the system were evaluated.The application results show that the detection accuracy is higher than 95%.The experimental results show that the system is feasible and efficient,the implementation cost is low,and has a wide range of applications,it could be widely used.
出处
《机电工程》
CAS
2012年第5期541-544,558,共5页
Journal of Mechanical & Electrical Engineering
