Research On Ground Intrusion Monitoring System Based On Seismic Wave

Seismic monitoring technique is mainly induced by vibration sensors moving object excitation seismic wave,and discriminant analysis of its area location,composed of its ground invasion monitoring system can be in under the condition of no additional auxiliary equipment,realize the all-weather work,not limited by the line of sight and visibility,has advantages of strong concealment,is not easy to be criminals found.Ground intrusion monitoring system based on seismic wave is widely used in important military applications such as battle area,frontier perimeter and training range.It also has wide application prospect in civil fields such as airport,bank,prison,ancient building and private residence.In this paper,a set of cable seismograph which can be applied to ground intrusion monitoring is designed.Each acquisition node takes ARM processor as the core,combines FPGA and 24-bit A/D technology to realize the acquisition capability of8-channel single station,and has a metal shell,which is suitable for long-term underground burial.The noise level,sinusoidal consistency,common mode rejection ratio and other core indicators can meet the data acquisition requirements of ground intrusion monitoring system.Based on the real-time data transmission,and with the application of invasion of trajectory monitoring requirements,design and develop a set of computer software management system,and made the data transmission and command interactive communication protocol,can realize the network more seismograph in distributed management,integrated early to pick up and vibration positioning data processing module,It can realize the intrusion location monitoring of graphical vibration target and support linkage warning.The core of intrusion target location is first-arrival pick algorithm and vibration location algorithm.Starting with STA/LTA,AIC,genetic algorithm and cross-correlation,the principle of the algorithm is analyzed,and the cross-correlation algorithm is determined to calculate the time difference of each channel.In this paper,a fast ground motion location algorithm based on block is proposed to reduce the computation and improve the efficiency of data processing.Meanwhile,in order to improve the positioning accuracy,TDOA algorithm is further studied,and Chan algorithm and Taylor algorithm are used to solve the positioning equation.In order to solve the boundary problem of block algorithm and TDOA algorithm,a ground motion region discrimination algorithm based on area calculation is proposed.Finally,the XCORR-TDOA positioning algorithm is determined and integrated into the system to realize data recovery and analysis,discrimination inside and outside the boundary,first-arrival pickup,target positioning and trajectory tracking.Simulation analysis and field test results show that the ground intrusion monitoring system designed in this paper can achieve continuous monitoring of the target area,target location and trajectory tracking,and has certain application value and market prospect.