基于ARM Cortex-M3的声磁EAS设计  

Acoustic-magnetic EAS system based on ARM Cortex-M3

作　　者：温宗周[1] 薛冬旺 刘亮[1] Wen Zongzhou Xue Dongwang Liu Liang(College of Electrics and Information, Xi＇an Polytechnic University, Xi＇an 710048,China)

机构地区：[1]西安工程大学电子信息学院,西安710048

出　　处：《电子测量技术》2017年第6期165-169,共5页Electronic Measurement Technology

摘　　要：针对普通EAS系统存在抗干扰性能差、检测灵敏度低、检测范围小、误报率高等缺点,设计了一种基于ARM Cortex-M3的声磁EAS系统。介绍了声磁EAS系统的工作原理和硬件结构框图,分析了声磁标签信号在时域和频域上的特征,提出了FFT信号频谱分析、信号互相关、最小二乘法拟合直线求取斜率、计算信号峰值数及峰值方差运算等多种检测声磁标签信号的算法,并详细描述了系统软件算法的设计。经过实验验证,本系统具有抗干扰性能强、检测灵敏度高、检测范围宽、误报率低等特点。An Acoustic-magnetic EAS system based on ARM Cortex-M3 is designed owing to bad anti-jamming ability,detection sensitivity,low detection range and high rate of false positives faults in common EAS system.This paper introduces the working principle and hardware structure diagram of acoustic-magnetic EAS system,analyses the acoustic-magnetic tags signal in time domain and frequency domain characteristics,proposes FFT spectrum analysis,signal cross-correlation,calculate the least squares fitting line slope variance calculation,calculation of signal peak value and peak varieties of acoustic-magnetic tags signal algorithm,and describes the system software design of the algorithm in detail.The practice test proves that the system has strong anti-jamming performance,high detection sensitivity,wide detection range,low rate of false positives,etc.

关 键 词：声磁 电子防盗系统 互相关 斜率 数字信号处理 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置] TN7[自动化与计算机技术—控制科学与工程]