声波探雷及其信号处理方法
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摘要
为了研究声波探雷机理,设计一个基于声-地震耦合的实验系统,并用曲线拟合的方法研究了复杂的测试信号变化规律。简述了声-地震耦合基本原理,分析了土壤-地雷系统的共振作用;然后,分别用扬声器和地震检波器串激发和接收地表振动;最后,采用平均值算法进行地表振动速度曲线拟合,并解释实验现象。结果显示,有地雷的地表振动速度与无雷的比值在很宽的频带内都>1,其峰值达24。表明地雷能引起地表振动的明显变化,所提出的实验系统及曲线拟合方法可用于声波探雷信号的进一步研究。
In order to investigate the mechanism of acoustic landmines detection,an acoustic-to-seismic coupling based experimental system was developed,and a curve-fitting method was adopted to study the measured complex signals.Acoustic-to-seismic coupling theory was briefly described,and the resonance mechanism of soil-mine system was analyzed.Then,a loudspeaker and a geophone array were employed to induce and receive the ground vibration respectively.Finally,an average algorithm was used to fit the curves of ground vibration velocity and to explain experimental phenomenon.Experimental results indicate that the ratio of ground vibration velocity on-to-off mine is greater than 1 in wide frequency range and up to 24 in peak frequency.It proves that landmines can induce the distinct changes of ground vibration,and proposed experimental system and curve-fitting method are applicable for further study of acoustic landmines detection signals.
In order to investigate the mechanism of acoustic landmines detection,an acoustic-to-seismic coupling based experimental system was developed,and a curve-fitting method was adopted to study the measured complex signals.Acoustic-to-seismic coupling theory was briefly described,and the resonance mechanism of soil-mine system was analyzed.Then,a loudspeaker and a geophone array were employed to induce and receive the ground vibration respectively.Finally,an average algorithm was used to fit the curves of ground vibration velocity and to explain experimental phenomenon.Experimental results indicate that the ratio of ground vibration velocity on-to-off mine is greater than 1 in wide frequency range and up to 24 in peak frequency.It proves that landmines can induce the distinct changes of ground vibration,and proposed experimental system and curve-fitting method are applicable for further study of acoustic landmines detection signals.
引文
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[9]YU S H,AVINASH G,THOMAS R W,et al..Physically based method for automatic mine detection using a-coustic data—a transmission zero approach[J].SPIE,2002,4742:701-708.
[10]ZAGRAI A,DONSKOY D,EKIMOV A.Resonance vibrations of buried landmines[J].SPIE,2004,5415:21-29.
[11]刘俊,秦岚,刘京诚,等.一种新型差动式压电加速度传感器[J].光学精密工程,2007,15(6):903-909.LIU J,QIN L,LIU J CH,et al..A novel differential piezoelectric accelerating sensor[J].Opt.Precision Eng.,2007,15(6):903-909.(in Chinese)
[12]高印寒,周晓华,梁杰,等.数据融合技术在声全息测量中的应用[J].光学精密工程,2007,15(7):1104-1111.GAO Y H,ZHOU X H,LIANG J,et al..Application of data fusion to acoustic holography[J].Opt.PrecisionEng.,2007,15(7):1104-1111.(in Chinese)
[13]林玉池,崔彦平,黄银国.复杂背景下边缘提取与目标识别方法研究[J].光学精密工程,2006,14(3):509-514.LIN Y CH,CUI Y P,HUANG Y G.Study on edge detection and target recognition in complex background[J].Opt.Precision Eng.,2006,14(3):509-514.(in Chinese)
[2]BIOT M A.Theory of propagation of elastic waves in a fluid-saturated porous solid.Ⅱ.Higher-frequency range[J].J.Acoust.Soc.Am.,1956,28(2):179-191.
[3]SABATIER J M,BASS H E,BOLEN L N.Acoustically induced seismic waves[J].J.Acoust.Soc.Am.,1986,80(2):646-649.
[4]SABATIER J M,BASS H E,BOLEN L N.The interaction of airborne sound with the porous ground:The theo-retical formulation[J].J.Acoust.Soc.Am.,1986,79(5):1345-1352.
[5]DONSKOY D,EKIMOV A,SEDUNOV N,et al..Nonlinear seismo-acoustic land mine detection and discrimina-tion[J].J.Acoust.Soc.Am.,2002,111:2705-2714.
[6]XIANG N,SABATIER J M.An experimental study on antipersonnel landmine detection using acoustic-to?seis-mic coupling[J].J.Acoust.Soc.Am.,2003,113(3):1333-1341.
[7]杨顶辉.双相各向异性介质中弹性波方程的有限元解法及波场模拟[J].地球物理学报,2002,45(4):575-583.YANG D H.Finite element method of the elastic wave equation and wavefield simulation in two-phase anisotropicmedia[J].Chinese J.Geophys,2002,45(4):575-583.(in Chinese)
[8]裴正林.三维双相各向异性介质弹性波方程交错网格高阶有限差分法模拟[J].中国石油大学学报(自然科学版),2006,30(2):16-20.PEI ZH L.A staggered-grid high-order finite difference method for modeling elastic wave equation in 3-D dual-phase anisotropic media[J].Journal of the University of Petroleum,China(Edition of Natural Science),2006,30(2):16-20.(in Chinese)
[9]YU S H,AVINASH G,THOMAS R W,et al..Physically based method for automatic mine detection using a-coustic data—a transmission zero approach[J].SPIE,2002,4742:701-708.
[10]ZAGRAI A,DONSKOY D,EKIMOV A.Resonance vibrations of buried landmines[J].SPIE,2004,5415:21-29.
[11]刘俊,秦岚,刘京诚,等.一种新型差动式压电加速度传感器[J].光学精密工程,2007,15(6):903-909.LIU J,QIN L,LIU J CH,et al..A novel differential piezoelectric accelerating sensor[J].Opt.Precision Eng.,2007,15(6):903-909.(in Chinese)
[12]高印寒,周晓华,梁杰,等.数据融合技术在声全息测量中的应用[J].光学精密工程,2007,15(7):1104-1111.GAO Y H,ZHOU X H,LIANG J,et al..Application of data fusion to acoustic holography[J].Opt.PrecisionEng.,2007,15(7):1104-1111.(in Chinese)
[13]林玉池,崔彦平,黄银国.复杂背景下边缘提取与目标识别方法研究[J].光学精密工程,2006,14(3):509-514.LIN Y CH,CUI Y P,HUANG Y G.Study on edge detection and target recognition in complex background[J].Opt.Precision Eng.,2006,14(3):509-514.(in Chinese)
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