射频EAS系统的关键技术

针对普通射频EAS系统检测灵敏度低、误报率高的缺陷,采用了窄带方式提高射频EAS系统的信噪比和抗干扰能力,提出了几个硬件关键技术,给出了各个关键技术的硬件方框图。关键技术包括锁相接收技术、梳状滤波技术、滑动基准技术和瞬态脉冲吸收技术。经过实验测试,这几个关键技术能提高EAS系统的检测灵敏度并使误报率有显著的改善。

The key technology of radio frequency EAS system

In this paper, the narrow-band way is adopted to improve signal noise ratio and anti-interference capability of ra- dio frequency EAS system, in view of shortcomings of low detection sensitivity and high false alarm rate in the common radio frequency EAS system. Several key hardware techniques are put forward. The hardware frame diagrams of the key techniques are put forward. The key techniques are composed of phase-locked receiving technique, comb filter technique, sliding datum technique and technique of absorbing instantaneous state interference. Detection sensitivity and false alarm rate of EAS system are prominently im proved by the use of the key techniques, which is indicated by practice test.