分布式小卫星SAR回波信号的相关性

本文通过建立单视复图像信号模型,提出并推导了分布式小卫星合成孔径雷达(SAR)回波信号之间新的相关系数模型.根据干涉复图像对的相位差与相关系数之间的关系,定义了方位向相位新概念,提出了分布式小卫星SAR干涉复图像对的相位差的均值包括干涉相位和方位向相位两部分,为了防止方位向相位引起较大的干涉相位估计误差,必须在数据处理中引入去方位向相位处理新方法,并给出了去方位向相位处理的具体实现方法.最后,进行了计算机仿真处理,仿真结果验证了本文分析的正确.

Correlation of Distributed Small Satellites SAR Echoes

There are both across-track and along-track baseline in Distributed Small Sate llites Synthetic Aperture Radar(DSS-SAR),which complicates the correlation of D SS-SAR echoes.After modeling the single-look complex SAR image in DSS-SAR,th e new correlation model for DSS-SAR echoes was proposed and derived.According to the relationship between correlation and phase difference of the DSS-SAR image pair,it is proposed that the phase difference of DSS-SAR complex image pair i n DSS-SAR includes two parts:one is interferometric phase which is related to te rrain elevation,another is azimuth phase which is brought from the along-track baseline and will decrease the terrain height accuracy dramatically.Then a new s tep,that is applied to remove the azimuth phase,must be added to the interfero me tric SAR data processing in DSS-SAR and the implementation of the azimuth phase removing step is presented.In the end,computer simulation is given and the res ults validate the correction of analysis in this paper.