Abstract: Fiber bragg grating perimeter intrusion alarm system realize the early warning for invading behavior by sensing the vibration of the protection area.Whenthe system is installed on the windy environment,howto identify intrusion behavior and strong interference, improve the alarm accuracy and reduce the rate of false positives, is important issue to explore. For multiple sensor unit installation location adjacent, invasion of disturbance consistency and regularity is obvious, and the disturbance generated by the wind and rain generally more random disordered, in this article, through analyzing the similarity between adjacent signal sensing unit, to prognosis wind environment, so as to dynamically adjust the policy of alarm, improve the early warning effect of system.

Key words: fiber bragg grating vibration measurement, similarity measure, perimeter intrusion alarm