基于ARM Cortex-M3的声磁EAS设计

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.

Acoustic magnetic EAS system based on ARM Cortex M3

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.