冻结土壤表面等边三角形截面柱运动目标复合电磁散射特性研究  

Composite Electromagnetic Scattering Characteristics of Equilateral Triangular Sectional Cylindrical Moving Target on Frozen Soil Surface

作　　者：陈玮 任新成[1] 王玉清[1] 赵晔[1] 杨鹏举 CHEN Wei;REN Xincheng;WANG Yuqing;ZHAO Ye;YANG Pengju(School of physics and electronic information,Yan’an University,Yan’an,Shaanxi Province 716000,China)

机构地区：[1]延安大学物理与电子信息学院,陕西延安716000

出　　处：《现代应用物理》2024年第5期109-116,共8页Modern Applied Physics

基　　金：国家自然科学基金资助项目(61861043,62261054,2061048)。

摘　　要：针对高寒地区冻结土壤表面运动目标雷达回波特性的研究需求,采用介电常数混合模型模拟冻结土壤的介电常数,应用空间域合成法模拟表面起伏遵守alpha-stable分布的冻结土壤表面,运用矩量法研究了入射波为锥形波时在冻结土壤表面上横向翻滚的等边三角形截面柱运动目标的复合散射问题,仿真了复合散射系数随散射角变化的曲线。数值计算结果表明,在三角形截面柱作复杂翻滚运动时,目标自身旋转对复合散射系数的影响最大,目标重心纵向振荡对复合散射系数的影响较大,而水平移动对复合散射系数的影响较小,同时考虑冻结土壤特性对复合散射特性的影响,入射波频率影响较大且入射波频率与复合散射系数呈负相关,土壤温度对复合散射系数影响较小且土壤温度与复合散射系数呈正相关,土壤质地对复合散射系数影响显著,取决于不同土壤质地自身电特性。理论上进一步推广了目标与特殊地物背景复合电磁散射计算方法,复合散射特性在诸多实践中又可提供必要的理论依据和可靠的数据支撑。To meet the research requirements of radar echo characteristics of moving target with frozen soil surface in alpine region,the dielectric constant of frozen soil is simulated by the dielectric constant mixing model.The frozen soil surface with surface undulation observing alpha-stable distribution is simulated by the spatial domain synthesis method.The moment method is applied to study the composite scattering of the equilateral triangular cross-sectional column moving target tumbling transversely on the frozen soil surface with a conical incident wave.The curves of the composite scattering coefficient with the scattering angle are simulated.The numerical calculation results show that,in the complex tumbling motion of the triangular cross-section column,the target’s own rotation has the largest influence on the composite scattering coefficient.The longitudinal oscillation of the target’s center of gravity has a large influence on the composite scattering coefficient,and the horizontal movement has a small influence on the composite scattering coefficient.The influence of the frozen soil properties on the composite scattering properties is also taken into account,and the frequency of incident waves has a large influence and is negatively correlated with the composite scattering coefficient.The influence of the soil temperature on the composite scattering coefficient is small and the soil temperature is positively correlated with the composite scattering coefficient.The influence of the soil texture on the composite scattering coefficient is significant depending on the different electrical characteristics of the soil texture itself.In theory,it further promotes the composite electromagnetic scattering calculation method of target and special feature background,and the composite scattering characteristics can provide the necessary theoretical basis and reliable data support in many practices.

关 键 词：冻结土壤 复杂运动目标 三角形截面柱 复合电磁散射 矩量法 

分 类 号：TL99[核科学技术—核技术及应用] O451[理学—无线电物理]