Fiber bragg grating perimeter intrusion behavior identification method and system based on time domain envelopment analysis

Abstract

The invention discloses a fiber bragg grating perimeter intrusion behavior identification method and system based on time domain envelopment analysis. The method comprises the following steps of receiving an outside vibration signal demodulated by a fiber bragg grating demodulation instrument; intercepting a signal with a fixed time span when the difference of a fluctuation value of the vibration signal and a preset average value is a specific value; pre-processing the intercepted signal to reduce the influence of system noise to the system; performing Hilbert transformation to the pre-processed signal to obtain a time domain envelope signal; framing the time domain envelope signal and acquiring characteristic parameters of framed time domain envelope signals; performing mode recognition of vibration behaviors according to characteristic parameter values and preset characteristic parameter threshold values; and generating alarm information and sending the information to a linkage device if the characteristic parameter values meet preset alarm conditions. The fiber bragg grating perimeter intrusion behavior identification method and system based on the time domain envelopment analysis is high in sensitivity on recognizing intrusion behaviors, strong in environment-resisting capacity, good in alarm performance and low in false alarm rate.

Description

technical field [0001] The invention relates to the field of perimeter security, in particular to a method and system for identifying perimeter intrusion behaviors of optical fiber gratings based on time-domain envelope analysis. Background technique [0002] Perimeter security refers to important areas, such as national defense borders, military bases, key government departments, oil depots and coal fields, nuclear power plants, solar power plants, power plant substations, banks, prisons, museums, airports, ports, villa communities, data centers, water treatment Factories, chemical plants, schools and other major infrastructures, in order to prevent illegal intrusion and sabotage activities, form security precautions along the perimeter of the site; ensure that personnel and property in the defense zone are under protection and control, and restrict the behavior of entering and leaving the defense zone , once the target enters and exits the defense zone from the prohibited ...

AI Technical Summary

Problems solved by technology

[0003] The existing fiber grating perimeter intrusion alarm system (CN101840615) mainly judges whether to alarm by the size of the vibration amplitude, and cannot distinguish the intrusion behavior and carry out the corresponding level of alarm according to the intrusion behavior

At the same time, the optical fiber perimeter intrusion system (CN101556724A) has defects such as inaccurate positioning and high false alarm rate

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