基于电磁波逆散射成像技术的地下目标探测研究

Research on Underground Target Detection Based on Electromagnetic Wave Reverse Scattering Imaging

电磁波逆散射成像是一种无损无接触式的探测手段,其研究对象是位于地下某区域内的未知物体。基于有限时域数值算法,可获得该区域的外部场的数据,利用回波信号反演未知物体的信息。研究表明:1)地下介质的相对介电常数的增加会减小电磁波在介质中的波速,从而导致双曲线顶点垂直坐标的增大,但不会改变双曲线曲率半径;2)地下介质的电导率的增加会使电磁波在介质内的传播损耗变大,大大减弱双曲线能量强度;3)散射体埋深深度的增加导致双曲线的垂直坐标变大,并且使双曲线曲率半径变大;4)散射体半径的增大使双曲线垂直坐标变小,双曲线曲率半径变大。本文基于电磁波逆散射成像技术的地下目标探测研究对回波信号系统分析,具有良好的指导作用。

Inverse scattering of electromagneticimaging is a kind of non-destructive and non contact detection method. Based on the finite time domain numerical algorithm, the data of the external field of the region is obtained, and the information of the unknown object is achieved by the echo signal. The results show that : 1) the increase of the relative permittivity of the underground medium will reduce the wave velocity of the electromagnetic wave in the medium, which leads to the increase of the vertical coordinate of the hyperbolic vertices,but will not change the radius of curvature of the hyperbolic curve; 2) The increase of the depth of the scatterer increases the vertical coordinate of the hyperbola and increases the radius of curvature of the hyperbola. 3) The increase of the depth of the scatterer increases the vertical radius of the hyperbola and increases the radius of curvature of the hyperbola. 4) Increases the radius of the scatterer so that the hyperbolic vertical coordinates become smaller and the hyperbolic curvature radius becomes larger. In this paper, the underground target detection based on electromagnetic wave backscattering imaging technology has a good guiding effect on the echo signal system analysis.