摘要
针对InSAR在重复轨道模式下的地形测绘精度受到大气效应制约这一问题,提出了一种基于小波相关性分析探测双基线InSAR干涉对间的地形误差相位,从而间接校正大气效应的轻量级方法。该方法克服了已有大气效应校正方法依赖外部水汽数据或数据量需求大的局限性。在校正大气效应之前,为保证地形误差相位的唯一相似性,需要去除其他任何相同或相似的相位分量。选取了不同气候、地形条件下的洛杉矶地区和湖南中部地区作为典型实验区验证算法的有效性,并利用ALOS-1 PALSAR数据进行了实验。实验结果表明:算法在沿海水汽含量变化剧烈和内陆地形崎岖多变的区域都能稳定地校正大气效应,使得生成数字高程模型(DEM)的精度最高能提高53.4%和45.0%。其中,在沿海的洛杉矶实验区与基于GACOS产品的大气校正方法对比,精度提高了49.7%。
This paper proposes a lightweight method based on wavelet correlation analysis to detect topographic error phases between dual-baseline synthetic aperture radar interferometry(InSAR)interferograms,thereby indirectly correcting atmospheric effects,which restrict the accuracy of topographic mapping in the repeat-pass mode of InSAR.This method overcomes the limitations of existing atmospheric correction methods,which rely on external water vapor data or have large data requirements.Before correcting atmospheric effects,to ensure the uniqueness of the topographic error phase,it is necessary to remove any other identical or similar phase components.The effectiveness of the algorithm is verified in typical experimental areas with different climatic and terrain conditions,namely the Los Angeles area in coastal regions and the central region of Hunan Province,utilizing ALOS-1 PALSAR data.Experimental results demonstrate that the proposed algorithm can stably correct atmospheric effects in regions with drastic changes in coastal water vapor content and rugged terrain inland,resulting in a maximum improvement of 53.4%and 45.0%in digital elevation model(DEM)accuracy,respectively.Specifically,in the coastal Los Angeles experimental area,compared with the atmospheric correction method based on GACOS products,the accuracy is improved by 49.7%.
作者
王烽
万阿芳
陈涛
喻赛男
刘小庆
WANG Feng;WAN Afang;CHEN Tao;YU Sainan;LIU Xiaoqing(The First Surveying and Mapping Institute of Hunan Province,Changsha 410114,China;Hunan Engineering Research Center of 3D Real Scene Construction and Application Technology,Changsha 410114,China)
出处
《测绘科学》
CSCD
北大核心
2024年第5期44-54,共11页
Science of Surveying and Mapping
基金
湖南省自然资源厅科技项目(湘自资科[2022]3号)
关键词
合成孔径雷达干涉
大气校正
小波变换
相关性分析
频谱分割
数字高程模型
interferometric synthetic aperture radar
atmospheric correction
wavelet transform
correlation analysis
split spectrum
digital elevation model
