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基于有限时域差分数值方法,电磁波透地技术正演地下目标体分别在干土、潮湿黏土、混凝土以及沥青组成的多种典型土壤结构下接收到的回波信号。研究发现:电磁波在干燥土壤中因为相对介电常数最小,其传播时间最短,双曲线的顶点离水平坐标轴最近;潮湿黏土的相对介电常数最大,故其双曲线的顶点坐标离水平坐标轴最远;混凝土和沥青的介电常数居中,它们的双曲线顶点的时间坐标在两者中间。本文基于有限时域差分法对四种典型土壤结构的回波双曲线信号系统分析,对以后实际测试环境具有良好的指导作用。
Based on the finite difference time-domain numerical method, the electromagnetic wave penetrating technique forwards the echo signals received by the underground target body under a variety of typical soil structures consisting of dry soil, moist clay, concrete and asphalt, respectively. The results show that electromagnetic wave has the shortest propagation time in dry soil, the shortest propagation time and the hyperbolic vertex closest to the horizontal axis. The wetted clay has the highest relative permittivity, so the hyperbolic vertex coordinate is away from the horizontal axis Farthest; concrete and asphalt dielectric constant center, their hyperbolic vertices time coordinates in between the two. In this paper, based on the finite difference method of time-domain finite difference method for four typical soil structure of the echo hyperbolic signal system analysis, the actual test environment has a good guiding role.