星载InSAR方位向逐行的顺轨有效基线计算方法  

A Line-by-Line Calculation Method of Space-Borne InSAR Azimuth Line-by-Track Effective Baseline

作　　者：刘昆池 苗洪利[1] 杨忠昊 张佳辉 Liu Kunchi;Miao Hongli;Yang Zhonghao;Zhang Jiahui(Faculty of Information Science and Technology,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学信息科学与工程学部,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2024年第1期122-127,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(62031005);山东省自然科学基金项目(ZR2020MD097)资助。

摘　　要：本文开展了星载干涉合成孔径雷达(Interferometric synthetic aperture radar,InSAR)顺轨有效基线计算方法的改进研究。首先利用多项式拟合卫星轨道方程,使用相干系数法计算待配准图像对的像元偏移量,通过建立顺轨有效基线与方位向行号的函数关系式获得逐行有效基线,解决了在整幅图像使用固定有效基线带来的误差问题。通过TanDEM-X/TerraSAR-X实测干涉数据对本文的改进方法进行了应用和检验,同时针对所使用干涉图像对的特殊线性关系建立了快捷实用的线性方程。通过在整幅图像上精细化使用顺轨有效基线会对诸如海流反演方面有效提高反演精度。In this paper,a research on the improvement of the calculation method of the effective baseline along the orbit of spaceborne InSAR is carried out.First,the polynomial is used to fit the satellite orbit equation,and the coherence coefficient method is used to calculate the pixel offset of the image pair to be registered.By establishing the effective baseline along the orbit The line-by-line effective baseline is obtained by the functional relationship with the azimuth line number,which solves the error problem caused by using a fixed effective baseline in the entire image.The improved method in this paper is applied and tested by the measured interferometric data of TanDEM-X/TerraSAR-X,and a fast and practical linear equation is established for the special linear relationship of the used interferometric image pair.By refining the use of an effective baseline along the track on the entire image,it will effectively improve the inversion accuracy,such as ocean current inversion.

关 键 词：星载干涉合成孔径雷达(InSAR) 顺轨有效基线 轨道方程 海流反演 

分 类 号：P715.6[天文地球—海洋科学]