Research And Implement Of Algorithms For The Fiber Perimeter Security System Based On Dual Mach-zehnder

With the rapid development of optical fiber sensing technology,optical fiber perimeter security monitoring technology based on Dual Mach-Zehnder interference vibration sensor came into being.Currently the optical fiber perimeter security system is difficult to achieve positioning accurately in the long range,and at the same time it can not identify various intrusions efficiently.In order to reduce the positioning error of the system in the long range monitoring and obtain more specific information of the disturbance,this paper focuses on positioning algorithm and pattern recognition algorithms in all fiber distributed intelligent perimeter security system,and completes the algorithm development on the basis of optimizing the system performance.This paper focus on the following aspects of the research work based on introducing the status quo of the fiber perimeter security technology and analyzing the remaining deficiencies:1.We introduce the distributed optical fiber sensing technology and study the sensing and positioning principle of the Dual Mach-Zehnder fiber perimeter security system.Besides,we analyze the significance of long-range location detection and pattern recognition for intrusion events.2.Based on the Dual Mach-Zehnder interference sensing theory model and its working principle in the long distance,we analyze the influence factors of positioning accuracy in this system.And then we optimize and perfect the localization algorithm in the long distance on the basis of the empirical mode decomposition method(EMD).Furthermore,the effectiveness of the algorithm is analyzed and verified by practical experiments.3.A high-efficiency multiple events discrimination method combining EMD and RBF(Radial Basis Function)is developed by using kurtosis estimation,empirical mode decomposition and radial basis function neural network.We analyze the feasibility of the algorithm through the simulation.4.We use the modular design idea to realize the system-related algorithms and control software based on the Visual Studio 2010 platform.In order to verity the long-term stability of the system,we have conducted in-field experiments to test the performance of the system.Besides,the intrusion is accurately located,real-time alarmed and video surveillance is made all-weather in the security area.