摘要
地理环境的场景回波模拟直接影响到合成孔径雷达(SAR)对抗系统仿真试验的效能评估。通过分析研究场景地表地物的电磁特性,利用高分辨率卫星影像数据的地物特征,采用面向对象的多尺度分类分割算法,提取得到了真实地物电磁特性数据。在构建分布目标模型时,先将实测数字高程模型(DEM)数据进行分形插值处理,建立几何模型,再利用小面单元模型建立散射模型,小面单元的电磁散射特性数据由与DEM数据对应区域的卫星影像数据提取得出,从而建立真实地理环境的SAR回波模型。通过ChirpScaling成像算法对回波信号进行处理,证明了方法的可行性。得到的场景回波模型与通常所用的忽略地物电磁特性得到的回波模型相比,具有逼真度高的优点,为SAR对抗系统仿真试验提供支持。
The scene echoed signal simulation of geography condition has direct influence on the efficiency evaluation of Synthetic Aperture Radar system countermeasure emulation test. In this paper, by analyzing the electromagnetic characteristic of scene surface objects, using the high - resolution satellite image data＇s surface features, and adopting the object - oriented multi - scale segmentation arithmetic, the electromagnetic data of true ground objects are extracted. In building the model of distribute target, a geometry model is established using the DEM data based on fractal interpolation. Then, a scattering model is built based on facet model. The electromagnetic scattering characteristic data of facet model are extracted from the satellite image corresponding to the DEM data, thus building a SAR echoed signal model under actual geography condition. The echoed signals are processed by ChirpSealing imaging algorithm to prove the feasibility of the method. The scene echoed model given by this paper is realistic and can support the SAR system countermeasure emulation test.
出处
《计算机仿真》
CSCD
北大核心
2009年第6期258-262,共5页
Computer Simulation
关键词
合成孔径雷达
分布目标模型
卫星影像
电磁特性
Synthetic aperture radar （SAR）
Model of distributed target
Satellite image
Electromagnetic characteristic
