GPSAR浅地表目标电磁特性分析  

Analysis of Subsurface Objects Electromagnetic Characteristic in Ground Penetrating Synthetic Aperture Radar

作　　者：肖志文[1] 谢绍斌[2,3] 常建[4] 何建国[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073 [2]电子科技大学电子工程学院,成都610054 [3]空军工程大学,西安710077 [4]中国人民解放军95957部队,北京100094

出　　处：《现代雷达》2009年第5期88-92,共5页Modern Radar

摘　　要：利用机载或车载地表穿透合成孔径雷达可以实现远距离大区域地表目标快速探测。为了降低虚警,需要根据目标的电磁特征设计检测器来区分目标和杂波。提出运用时域有限差分方法结合傅里叶变换进行地表穿透合成孔径雷达浅地表目标电磁特征计算的方法。首先根据复杂背景媒质的散射特性获取目标的激励场,然后分析复杂背景下目标的电磁特性。利用该方法模拟了平坦地面下的金属地雷的散射特性,并与矩量法的计算结果进行了比较,结果基本一致。我们模拟了高斯起伏地面下的M6A1金属地雷,理论数值计算结果与实测数据结果基本吻合。模拟结果显示浅地表金属地雷图像具有双峰特征,它将有效地提高地雷检测性能。Air-or vehicle-borne Ground Penetrating Synthetic Aperture Radar （GPSAR） has the ability to detect subsurface objects over a large area from a standoff distance quickly. In order to reduce the false alarms in object detection, it is required to design an efficient detector based on the difference of electromagnetic characteristics between objects and clutter. A method for analyzing e- lectromagnetic characteristics of subsurface objects with FDTD method combined with fourier transform is proposed. In order to ob- tain the reflected field of the object, scattered field of the complicated background is calculated firstly. Then, the electromagnetic characteristics of subsurface object is analyzed. We model the time-domain scattered field of metallic landmine buried beneath a fiat air-ground interface. Numerical results fit the data computed by moment method. Finally, the electromagnetic characteristics of M6A1 metallic landmine buried beneath a Gaussian rough interface is analyzed. Numerical results also fit real data based on actual measurement. Electromagnetic modeling result shows that the image of subsurface metallic landmine has a two-peak characteristic, which will improve the landmine detection performance greatly.

关 键 词：合成孔径雷达 时域有限差分法 矩量法 浅地表目标 散射场 

分 类 号：TN958[电子电信—信号与信息处理]