一种基于Sentinel-1连续干涉像对的PSInSAR算法

doi:10.13474/j.cnki.11-2246.2018.0379

摘要/Abstract

摘要： 针对现有的PSInSAR算法中单主影像干涉像对组合方法存在相干性较低、处理流程复杂等问题，利用Sentinel-1数据具有更短时间基线和空间基线的优势，提出了连续干涉像对的组合方法。该方法通过成像时间相邻的影像之间组合生成干涉图，提高相干性，获取信噪比更高的干涉图、质量更优的PS点和更精确的相位解缠结果。针对连续干涉像对组合的特点，提出了一种通过干涉图差分求解地形误差相位的算法，提高了解算精度，达到了提高形变监测精度的目的。最后以天津市为沉降监测试验区，获取了该地区2016年11月至2018年1月共32幅Sentinel-1B影像，生成31幅连续干涉图，利用新算法生成了该地区的沉降速率图，并通过与水准数据进行了对比，验证了新算法的有效性。

关键词: PSInSAR, 相干性, 连续干涉像对, 沉降监测

Abstract: The traditional PSInSAR algorithm use single master baseline configuration, which may cause low coherence and complicated workflow. Aiming at this problem, this paper makes use of the data of Sentinel-1 which have shorter temporal and perpendicular baseline,introduces consecutive interferograms.This new baseline configuration forms interferograms between two images adjacent in acquisition time,which can improve coherence,so that higher quality of interferograms and PS points,and more accurate phase unwrapping results can be got.And a new algorithm based on this new baseline configuration properties for estimating topographic error phase by interferograms difference are introduced at the same time,and in this way more accurate results can be achieved.We acquire 32 Sentinel-1B images over Tianjin city from November 2016 to January 2018,to detect subsidence of this area.As a result,31 consecutive interferograms are formed,we use time series analysis to generate the subsidence velocity map over Tianjin city,and finally compare the results to levelling data to validate this new algorithm.

Key words: PSInSAR, coherence, consecutive interferogram, subsidence observation

中图分类号:

P237

刘飞, 潘斌. 一种基于Sentinel-1连续干涉像对的PSInSAR算法[J]. 测绘通报, 2018, 0(12): 30-35.

LIU Fei, PAN Bin. A New PSInSAR Algorithm Based on Sentinel-1 Consecutive Interferograms[J]. 测绘通报, 2018, 0(12): 30-35.

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