多路环形线圈车辆检测器设计  

Design of multiple detecting car system based on loop-coil

作　　者：张永忠[1] 张军强[1] 李颖宏[1] 

机构地区：[1]北方工业大学城市道路交通智能控制技术北京市重点实验室,北京100144

出　　处：《电子技术应用》2013年第11期23-26,共4页Application of Electronic Technique

基　　金：国家"863"高技术研究发展计划资助项目(2012AA112401);学科建设-国家特殊需求-城市道路交通智能控制人才培养项目(PXM2013_014212_000031)

摘　　要：介绍了一种新型的多路环形线圈车辆检测器的设计方法。该方法基于电磁感应原理,通过测量振荡电路的频率信号判断车辆通过的基本信息。本设计中的多路环形线圈车辆检测器硬件基于ATmega128单片机内部计数器与外部计数器协同工作实现等精度测频。软件部分,通过自适应中值滤波算法进行数据采样,有效抑制了错误数据对系统逻辑判别的干扰。系统采用了多路检测节点分时选通工作模式完成16路检测节点抗串扰设计,增强了系统稳定性。实际应用测试证明,该检测器具有简单可靠、灵敏度高、自适应性强的特点。This paper introduced the design method of a new-style loop detector. Based on the principle of electromagnetic in- duction, this method is able to judge the basic information of the vehicles by measuring the signal frequency of oscillation circuit. The hardware of loop detector measures frequency in equal precision by cooperative working of external counter and the internal counter of ATmega128 single-chip microcomputer. Through adaptive median filtering algorithm, the interference of error data to logic judgment can be suppressed effectively. The system stability is enhanced by crosstalk resistant design of 16-road detection nodes which uses multi-channel detection node time-sharing strobe mode. The application results show that the detector is simple and re- liable, and of ~reat sensitivitv and strnn~, nrl^nt^hilitv

关 键 词：环形线圈 车辆检测 多路分时选通 软硬件协同设计 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]