Interference processing for zero intermediate frequency multi-baseline InSAR sssisted by DEM
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摘要:
借鉴DEM辅助的思想,提出了DEM辅助的零中频多基线InSAR干涉处理方法.该方法利用外部粗DEM模拟的干涉图与多基线干涉图组中的最低频原始干涉图做差分处理,得到零中频干涉图;再对零中频干涉图进行滤波和相位解缠处理后重新加回模拟相位,构建为原始基准干涉图.利用该基准干涉图逐步指导较高频干涉图由粗到精地进行相位解缠,进而高精度地反演DEM.充分利用了零中频干涉图的易解性和高频干涉图的高精度性,解决了高频干涉图频谱混叠、相位欠采样处的解缠难题.采用邯郸地区6景ENVISAT ASAR数据进行了干涉处理实验,实验结果验证了所提方法的有效性.
Based on the idea of processing assisted by DEM,interference processing method for zero intermediate frequency multi-baseline InSAR assisted by DEM was proposed.Simulated interferogram using external rough DEM and the lowest-frequency original interferogram in the multi-baseline interferogram group were made difference processing,and zero intermediate frequency interferogram was obtained.After filtering and unwrapping,the zero intermediate frequency interferogram added back the simulated phase detracted before.Then the reference interferogram was constructed,which is used to guide higher-frequency interferograms phase unwrapping from coarse to fine.And ultimately DEM can be inverted with high accuracy.This method made full use of the easy resolution of zero intermediate frequency interferogram and the high-precision of high-frequency interferograms,and solved the unwrapping problem at the frequency aliasing and the phase under sampling of the high-frequency interferogram.The interference experiment was carried out using ENVISAT ASAR data of six scenes in Handan area.And the effectiveness of proposed method was verified by the results.
作者:
刘辉 徐青
Liu Hui;Xu Qing(School of Resources and Environment,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;School of Surveying and Mapping,Information Engineering University,Zhengzhou 450001,China)
机构地区:
华北水利水电大学资源与环境学院 信息工程大学地理空间信息学院
出处:
《betway官方app 学报：自然科学版》 CAS 北大核心 2018年第5期42-47,共6页
基金:
国家自然科学基金(41071296 61401509 41371439) 河南省高等学校重点科研项目(19A420008)
关键词:
DEM辅助 零中频 多基线 合成孔径雷达干涉测量 差分
assisted by DEM zero intermediate frequency multi-baseline InSAR difference
分类号:
P237 [天文地球—摄影测量与遥感]
