一种残差点退化的四向最小二乘InSAR相位解缠算法
A Singularity Point Degradation Four Directions Least-square Algorithm for InSAR Phase Unwrapping
作者:王正勇(四川大学 电子信息学院图像信息研究所, 四川 成都 610065);朱挺(四川大学 电子信息学院图像信息研究所, 四川 成都 610065);何小海(四川大学 电子信息学院图像信息研究所, 四川 成都 610065);罗代升(四川大学 电子信息学院图像信息研究所, 四川 成都 610065)
Author:Wang Zhengyong(Inst. of Image Info.,School of Electronics and Info. Eng., Sichuan Univ., Chengdu 610065, China);Zhu Ting(Inst. of Image Info.,School of Electronics and Info. Eng., Sichuan Univ., Chengdu 610065, China);He Xiaohai(Inst. of Image Info.,School of Electronics and Info. Eng., Sichuan Univ., Chengdu 610065, China);Luo Daisheng(Inst. of Image Info.,School of Electronics and Info. Eng., Sichuan Univ., Chengdu 610065, China)
收稿日期:2009-01-05 年卷(期)页码:2010,42(1):185-190
期刊名称:工程科学与技术
Journal Name:Advanced Engineering Sciences
关键字:InSAR成像;相位解缠;残差点;四向最小二乘法
Key words:InSAR imaging;phase unwrapping;singularity points;four directions least-square algorithm
基金项目:其它
中文摘要
相位解缠是InSAR(干涉合成孔径雷达)成像的关键步骤之一。然而如何有效地处理相位残差点是相位解缠的难点。为有效去除或抑制残差点,提出了一种残差点退化的四向最小二乘解缠算法,该算法首先检测干涉图中的残差点,然后利用残差点的邻域像素对其进行补偿,最后使用四向最小二乘法进行相位解缠,取得全局最优解。实验结果表明,该算法在处理残差点密度较大的干涉图具有较好的解缠效果。
英文摘要
Phase unwrapping is the key step of InSAR (Interferometric Synthetic Aperture Radar) imaging,and how to process phase singularity points (SPs) effectively is very difficult problem in phase unwrapping. To remove singularity points effectively, an unwrapping algorithm based on SPs degradation was proposed. Firstly, SPs in interference pattern were detected .Then, these SPs were compensated using neighborhood pixels,and finally the four directions least-square algorithm was employed for phase unwrapping to achieve global optimum.Experiments showed that the new method is effective to remove SPs in high-density SPs interference pattern.
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