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融合长短基线的干涉图解缠错误自动改正
Automatic Correction of Phase Unwrapping Errors by Fusing Long and Short Baselines
【摘要】 合成孔径雷达干涉测量(interferometric synthetic aperture radar, InSAR)技术因具有全天时、全天候、大范围的独特优势,已被广泛应用于地球科学研究、自然灾害监测和环境管理等领域。然而,受地表失相干、干涉条纹密集等因素影响,InSAR数据处理关键的步骤——干涉图相位解缠常出现错误,进而影响高程反演和地表形变监测精度。为此,文章提出了一种融合长短基线干涉相位闭合环的解缠错误自动探测与改正方法,并利用湖南省-江西省高植被覆盖区的Sentinel-1雷达影像开展了算法验证。实验结果表明,该方法可有效地改正干涉相位解缠错误,这对InSAR技术提升高程反演和形变监测精度具有重要意义。
【Abstract】 Interferometric synthetic aperture radar(InSAR) has been widely applied in the fields of earth science research, natural disaster monitoring, and environmental management, due to its unique advantages in all-weather, all-day and large-scale. However, affected by surface decorrelation and dense interferometric fringes, the crucial step in InSAR data processing, which is phase unwrapping of interferograms, often encounters errors, subsequently reducing the accuracy of elevation inversion and surface deformation monitoring. To address this issue, this paper proposes an automatic detection and correction method for phase unwrapping errors by integrating long and short baseline interferometric phase closure loops. The algorithm is validated by the Sentinel-1 SAR images over the densely vegetated region in Hunan province and Jiangxi province. The experimental results demonstrate that the proposed method can effectively correct interferometric phase unwrapping errors, which is of significant importance for improving the accuracy of elevation inversion and deformation monitoring by InSAR technology.
【Key words】 interferometric synthetic aperture radar; correction of phase unwrapping error; long-short baseline; phase closure; phase gradient;
- 【文献出处】 遥感信息 ,Remote Sensing Information , 编辑部邮箱 ,2024年05期
- 【分类号】P237
- 【下载频次】20