提高ISAR分辨率的两种外推方法性能之比较  

Comparison of ISAR Resolution Improvement Based on Two Cross Spectra Extrapolations

作　　者：李斌[1] 慈林林[2] 万建伟[1] 姚康泽[2] 王岩[2] 

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 [2]北京信息高技术研究所,北京100085

出　　处：《雷达科学与技术》2006年第6期358-362,381,共6页Radar Science and Technology

摘　　要：从ISAR成像原理出发,分析了散射点越距离单元走动(MTRC)对ISAR分辨率的影响,通过高分辨DFT数据矩阵求逆和AR模型进行方位谱数据外推;对不同的信噪比条件下,两种方法外推前后ISAR像的距离和方位分辨率及相关性作了比较分析。分析表明,方位谱外推的方法可在提高方位向分辨率的同时,有效地克服MTRC对距离向分辨率的降质,从而提高ISAR的成像质量。From the analysis of range and cross resolutions of ISAR, the influence of MTRC on range resolution is discussed. Methods of high-resolution DFT extrapolation and AR model-based extrapolation are investigated methodologically. Through the comparison of range and cross section profiles obtained from 4 cross angular scopes at 6 different signal noise ratios, the simulation results show that two methods can improve cross resolution and-reduce the influence of MTRC on range resolution.

关 键 词：谱外推 ISAR像分辨率 AR模型 高分辨DFT越距离单元走动 

分 类 号：TN958[电子电信—信号与信息处理]