合成孔径雷达干涉图像的质量分析与匹配

Interferometric Synthetic Aperture Radar Data Analysis and Image Matching

合成孔径雷达干涉测量是近年来发展起来的空间对地观测新技术 ,其对雷达图像及相关处理技术都有严格要求 .首先从基线距、图像相关性以及信噪比等方面确定了干涉图像对选取的定量方法 ;讨论了从粗到精的干涉图像对分步匹配方法 ,在最小二乘精匹配阶段采用相干图的相干系数作为匹配测度 ,兼顾了强度与相位信息对匹配的贡献 ,匹配结果更为合理 ,为后续的相位解缠与生成数字高程模型提供了保证 .用所讨论的方法处理ERS - 1/ 2获取的中国东南部某地区图像 。

Synthetic aperture radar interferometry is a new approach of earth observation from space developed in the last few years.It requires high data quality and the involved techniques are quite complicated.First,the paper proposes quantitative criterions for data quality assessment in several aspects involving baseline,correlation and signal-noise ratio etc;then details are dealt with in a multi-step image co-registration technique.To achieve more reliable matching result,at the least-square matching step,the loop-end criterion is interferometric coefficient of interferogram,which comprises both amplitude and phase information.This is the precondition for later phase unwrapping and digital elevation model extraction.Finally,these techniques are verified with southeast China ERS-1/2 repeat-pass data and promising results are achieved.