应用伪随机码的EAS系统

EAS System Employing Pseudorandom Coding Method

在通信系统中,伪随机码应用十分广泛,其优点是抗干扰能力强,保密性好。在比较两种伪随机码产生方法 的基础上,分析了应用伪随机码的EAS(ElectronicArticleSurveillance)系统的优点:抗干扰能力强和多系统协调工作性 能好。同时,提出一种以伪随机特征码为纽带的多个EAS系统一起工作的协调方式。然后,通过对现有EAS系统不足点的 分析,提出了新的检测信号有效性的判断依据,即信号的测量值与平均值的偏差是符合高斯分布的,以及相应的评判方法, 即计算信号测量值与平均值的偏差,如果测量偏差大于某个域值,则触发一个报警。由此,进一步详细阐述了将伪随机码 技术应用于EAS系统的具体方法及其抗干扰能力。

Pseudorandom coding method is widely used in communication systems by virtue of its excellent immunity to periodic interferences and its strong ability of keeping secrets. This paper makes an analysis of the virtues and good cooperation of multiEAS systems employing pseudorandom coding method after comparing two methods of pseudorandom coding. Then, a method of how multiEAS systems cooperation, which using pseudorandom character code as their interconnections is also presented here. Lastly, a whole new basis that the standard deviation of detected portion of a random sequence of pulses, and it appears as normally distributed or Gaussian noise as well as accordingly a new method to check the random pulses by calculating a meaning and standard deviation of portion of the string of random pulses received, comparing the portion of the string of pulses received with the string of random pulses transmitted and then triggering an alarm if the portion of the string of nonperiodic pulses received is above a threshold value is presented, and more details in how to realize an EAS system using the coding method, in addition, the ability of its antiinterference.