采用光纤振动传感技术研制了应用于国境线的光纤周界安全防范系统。通过对其进行入侵者翻越周界围栏的入侵探测实验,结果表明,它可有效地敏感由入侵行为产生的振动。通过对振动进行分析表明,翻越围栏的行为会产生非平稳随机信号,该信号存在多个幅度峰值,且频率都集中在500Hz以下的低频,为自动识别算法的开发提供了设计依据。实验环境中风力会产生300Hz以下的低频背景噪声,会增加识别的难度。 Optical Fiber Vibration Sensing Technology has been developed to apply the perimeter security fiber optic system. The intrusion detection experiment of intruding over the perimeter fence shows that it can effectively sense the vibration caused by intrusion behavior. The analysis of the vibration shows that the behavior of crossing the fence will generate a nonstationary random signal. The signal has multiple amplitude peaks and the frequencies are concentrated at a low frequency below 500 Hz, providing a basis for the design of an automatic recognition algorithm. The wind in the experimental environment will produce low frequency background noise below 300Hz, which will increase the difficulty of identification.