不同土壤类型的粗糙地面与其下方埋藏目标复合电磁散射研究

Investigation of electromagnetic scattering interaction between the buried target and the rough surface in different types of soil

利用MOM研究了不同土壤类型的一维有耗介质粗糙地面与其下方二维埋藏目标的复合电磁散射问题,在数值计算中,引入了锥形入射波以减少粗糙面模拟中由于人为截断所引起的计算误差.当给定入射波频率、土壤成分及土壤温度和土壤湿度后,可以根据相关模型计算出土壤的相对介电常数.数值结果以二维无限长导体圆柱为例,利用Monte Carlo方法统计计算了双站复合散射截面随土壤类型、土壤湿度、入射波频率及均方根高度等的变化情况,并做了详细分析及讨论.该研究结果对于探地雷达在民用、军事、工业等多领域的应用具有一定的理论指导价值.

The problem of the composite electromagnetic scattering from 2-D buried target at the 1-D randomly rough surface with lossy media,which is different in different types of soil,is solved by the method of moments,while the tapered incident wave is chosen to reduce the truncation error. The relative dielectric constant of the soil could be calculated according to the frequency of the incident wave,the soil components,the soil moisture and soil temperature based on a cartain model. The Monte-Carlo procedure is employed to calculate the bistatic scattering cross section,which is dependent on the soil components,the soil moisture,the frequency of the incident wave,as well as the rms height of the randomly rough surface in details. The numerical results provide a guide in the application of ground penetrating radar in military,civil,as well as industrial fields.