土壤表面与运动目标复合电磁散射的矩量法研究

Study on Composite Electromagnetic Scattering from a Moving Target above the Soil Surface by the Method of Moment

中文关键词:  复合电磁散射  土壤表面  矩量法  三角形截面柱  运动目标

英文关键词:composite electromagnetic scattering  soil surface  method of moment  triangular section column  moving target

中文摘要:

      为了满足土壤表面上方雷达目标检测、识别和分类等的需要,采用空间域合成法生成高度起伏遵守 Alpha-stable分布的土壤表面,选用 Topp 模型模拟土壤的介电常数,运用矩量法研究了锥形波入射条件下土壤与其上方运动的三角形截面柱的复合电磁散射问题,通过数值计算得到了复合散射系数随散射角的变化曲线,分析了等边三角形和不规则三角形截面柱在土壤表面上方横向平移、纵向平移、转动以及电磁波入射角对复合散射系数的影响。 数值计算结果表明:复合散射系数随散射角振荡地变化,等边三角形截面柱的纵向平移和转动对复合散射系数有较大的影响,而横向平移对复合散射系数的影响很小;不规则三角形截面柱的横向平移和纵向平移对复合散射系数产生的影响很小,转动对复合散射系数的影响较大。 有关结果可为民用、军用领域工程问题提供理论依据和实践方法。

英文摘要:

      In order to meet the needs of radar target detection, recognition and classification above the soil surface, the spatial domain synthesis method is used to generate the soil surface with high undulation that obey the Alpha-stable distribution, the Topp model is selected to simulate the dielectric constant of the soil, and the method of moments is used to study the composite electro-magnetic scattering from the moving triangular cross-section column above the soil surface under the condition of cone wave incidence, the variation curve of the composite scattering coefficient with the scattering angle is obtained by numerical calculation, the influence of horizontal translation, vertical translation, rotation and the incidence angle of electromagnetic wave of equilateral triangle and irregular triangular columns on the composite scattering coefficients is analyzed. The numerical results show that the horizontal translation and rotation of the equilateral triangular cross-section cylinder have a great influence on the composite scattering coefficient, while the vertical translation has a very small influence on the composite scattering coefficient; the vertical and horizontal translation of irregular triangular cross-section columns have little influence on the composite scattering coefficient, while the rotation has great influence on the composite scattering coefficient. The results can provide theoretical basis and practical methods for engineering problems in civil and military fields.