高分辨SAR图像中杂波的统计特性分析

为使SAR图像目标检测在复杂多变的地物杂波环境中获得最佳的性能,研究SAR图像中杂波的统计特性将是一件有意义的工作.在综合对比已有统计模型的基础上,从理论上重点分析了G0分布.运用实测SAR场景中表征不同地物类型的大量数据,从幅度直方图拟合、拟合精度检验等方面深入分析了杂波的统计特性.得出了在目前已有实用的统计模型中,C0分布最适合于描述SAR图像杂波统计特性,它是一种对于均匀、一般不均匀和极不均匀杂波区域建模的通用分布的新结论.因此,以C0分布为杂波模型的目标检测算法具有巨大的应用潜力.

Statistical Analysis of Clutter in High-Resolution SAR Images

In order to ensure the best performance of target detection in SAR images in complex and varying clutter,it is signifi- cant to study the statistical property f clutter.Based on the synthetic comparison of the existing statistical model,the G~0 distribution is an- alyzed in theory with emphasis.By applying the real SAR data denoting different terrain categories,the clutter is analyzed comprehen- sively with amplitude histogram fitting,the goodness-of-fit,etc.A new conclusion is obtained that the G~0 distribution is most appropriate to describe the statistical property of clutter and is a general distribution for statistically modeling the homogeneous,heterogeneous and extremely heterogeneous clutter regions.Thus,the G~0 distribution has great potential to the algorithm design of target detection.