具有地面起伏特征的三维场景回波模拟研究  

Raw Signal Simulation Research of Three-Dimensional Scene with Undulate Characteristics

作　　者：任三孩[1] 常文革[1] 李建阳[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《雷达科学与技术》2007年第5期342-348,共7页Radar Science and Technology

摘　　要：由于雷达平台一般都是在三维场景中飞行,而三维场景具有地面起伏特征,因此具有地面起伏特征的三维场景回波模拟就具有很强的现实意义。本文分析了具有地面起伏的三维场景回波模拟的方法,阐述了三维场景的建模方法、DEM分形插值算法和利用平面单元模型计算后向散射系数的方法,讨论了雷达图像固有的几何畸变、斑点噪声对回波的影响,最后分析了雷达回波信号的结构,给出了回波模拟的时域算法和频域算法,完成了真实三维场景的成像仿真试验,得到了理想的结果,验证了本文所述方法的有效性。The raw signal simulation of undulate three-dimensional scene is of important significance, because SAR radar platform always flies in three-dimensional scene which has undulate characteristics. A method of the raw signal simulation of undulate three dimensional scene is analysed in this paper. The modeling of undulate three-dimensional scene, the fractal interpolation algorithm of DEM, and the computation of backscatter coefficient using the facet model are expatiated. Also, the influences of particular geometrical distortions and speckles on the echo signal are discussed. In the end the echo signal model is established and the algorithms of its time-domain and frequency-domain are presented. The validity of the method presented in this paper has been verified by simulation experiment of imaging undulate three-dimensional scene.

关 键 词：三维场景 分形插值 平面单元模型 几何畸变 合成孔径雷达 

分 类 号：TN955[电子电信—信号与信息处理] TN958[电子电信—信息与通信工程]