Effect of variability of soil physical properties on clutter and false alarms in land mine detection

[1] The effects of variability of the ground on land mine detection and false alarm rates are analyzed within the framework of a viscoelastic-layered model of the ground. A matrix technique was used to describe sound interaction with layered viscoelastic ground. The resonance method in combination with a global search method is used to estimate a set of parameters for a three-layered viscoelastic ground model. Results of the estimation show good agreement between computed and experimental data. The effect of a finite size of sound source on the acoustic-to-seismic transfer function is discussed. The effect of variability of ground properties on the acoustic-to-seismic transfer function (admittance function) is analyzed. Analysis is performed on the plane of parameters of the layered ground in a wide frequency range for all angles of incidence. It is revealed that small variations in the shear speed in the top layer of ground will not cause variation in the acoustic-to-seismic transfer function at low frequencies but may cause strong variation at high frequencies. Results of outdoor measurements of the acoustic-to-seismic transfer function are presented, and a correlation between the high magnitude of the acoustic-to-seismic transfer function in certain frequency ranges and moisture content on the surface is revealed. A simple model explaining the correlation between moisture content in the upper layer, the acoustic-to-seismic transfer function, and ground properties is suggested.

[1]  W. Thomson,et al.  Transmission of Elastic Waves through a Stratified Solid Medium , 1950 .

[2]  Henrik Schmidt,et al.  Efficient numerical solution technique for wave propagation in horizontally stratified environments , 1985 .

[3]  A. J. Robins,et al.  Plane-wave reflection from a solid layer with nonuniform density, sound speed, and shear speed , 1998 .

[4]  Eugene P. Wigner,et al.  Capture of Slow Neutrons , 1936 .

[5]  Ning Xiang,et al.  An investigation of acoustic-to-seismic coupling to detect buried antitank landmines , 2001, IEEE Trans. Geosci. Remote. Sens..

[6]  Bjoern Ursin,et al.  Review of elastic and electromagnetic wave propagation in horizontally layered media , 1983 .

[7]  James M. Sabatier,et al.  Probe microphone instrumentation for determining soil physical properties: testing in model porous materials , 1996 .

[8]  Peter Gerstoft,et al.  GLOBAL INVERSION BY GENETIC ALGORITHMS FOR BOTH SOURCE POSITION AND ENVIRONMENTAL PARAMETERS , 1994 .

[9]  Jon F. Claerbout,et al.  Synthesis of a layered medium from its acoustic transmission response , 1968 .

[10]  M. Fokina,et al.  Numerical modeling of the reflection coefficients for the plane sound wave reflection from a layered elastic bottom , 2000 .

[11]  J. E. Piercy,et al.  Outdoor sound propagation over ground of finite impedance , 1976 .

[12]  Clint W. Frasier,et al.  Discrete time solution of plane P-SV waves in a plane layered medium. , 1970 .

[13]  J. E. Piercy,et al.  Effective flow resistivity of ground surfaces determined by acoustical measurements , 1983 .

[14]  D. Albert.  Attenuation of Outdoor Sound Propagation Levels by a Snow Cover , 1993 .

[15]  N. A. Haskell.  The Dispersion of Surface Waves on Multilayered Media , 1953 .

[16]  Sven‐Ingvar Thomasson.  Sound propagation above a layer with a large refraction index , 1977 .

[17]  Sven Ivansson,et al.  Low-frequency slow-wave dispersion computations by compound-matrix propagation , 1999 .

[18]  Peter Gerstoft,et al.  Full Field Inversion Methods In Ocean And Seismo Acoustics , 1995 .

[19]  M. Fokina.  RESONANCES OF ACOUSTIC WAVES INTERACTING WITH AN ELASTIC SEABED , 2001 .

[20]  Kelly D. Sherbondy,et al.  Performance assessment of a blind test using the University of Mississippi's acoustic/seismic laser Doppler vibrometer (LDV) mine detection apparatus at Fort A. P. Hill , 2000, Defense, Security, and Sensing.

[21]  N. Harrop,et al.  The exploitation of acoustic-to-seismic coupling for the determination of soil properties , 2000 .

[22]  Yvan Champoux,et al.  On acoustical models for sound propagation in rigid frame porous materials and the influence of shape factors , 1992 .

[23]  Ning Xiang,et al.  An experimental study on antipersonnel landmine detection using acoustic-to-seismic coupling. , 2003, The Journal of the Acoustical Society of America.

[24]  Lee N. Bolen,et al.  The acoustic transfer function at the surface of a layered poroelastic soil , 1986 .

[25]  Ravindra N. Gupta,et al.  Reflection of elastic waves from a linear transition layer , 1966 .

[26]  J. W. Dunkin,et al.  Computation of modal solutions in layered, elastic media at high frequencies , 1965 .

[27]  E. N. Thrower.  The computation of the dispersion of elastic waves in layered media , 1965 .

[28]  Craig J. Hickey,et al.  Effects of Compaction on the Acoustic Velocity in Soils , 2004 .

[29]  John A. Orcutt,et al.  Acoustic pulse propagation above grassland and snow: Comparison of theoretical and experimental waveforms , 1990 .

[30]  Daniel H. Cress,et al.  Coupling of airborne sound into the earth: Frequency dependence , 1980 .

[31]  Michael D. Serotta,et al.  Acoustics of layered media II , 1990 .

[32]  Herbert Überall,et al.  Resonance theory of acoustic waves interacting with an elastic plate , 1979 .

[33]  Freeman Gilbert,et al.  Propagator matrices in elastic wave and vibration problems , 1966 .

[34]  John A. Orcutt,et al.  Observations of low‐frequency acoustic‐to‐seismic coupling in the summer and winter , 1989 .

[35]  Lee N. Bolen,et al.  The interaction of airborne sound with the porous ground: The theoretical formulation , 1986 .

[36]  Stan E. Dosso,et al.  An adaptive-hybrid algorithm for geoacoustic inversion , 2001 .

[37]  Alvin J. Robins.  Generation of shear and compression waves in an inhomogeneous elastic medium , 1994 .