Assessing Ionospheric Influence on L-Band SAR Data: Implications on Coseismic Displacement Measurements of the 2008 Sichuan Earthquake
Assessing Ionospheric Influence on L-Band SAR Data: Implications on Coseismic Displacement Measurements of the 2008 Sichuan Earthquake
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DOI：
10.1109/lgrs.2009.2033317
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发表时间：
2010-04
影响因子：
4.8
通讯作者：
D. Raucoules;M. Michele
中科院分区：
文献类型：
--
作者：
D. Raucoules;M. Michele
电离层对L波段合成孔径雷达信号相位的贡献严重限制了用差分合成孔径雷达干涉测量和雷达幅度像偏移测量的地面位移测量。这些贡献导致差分干涉图上的电离层相位屏和偏移图上方位像素相对位置的方向波动。在这封信中，我们提出了一种估计和消除电离层对L波段合成孔径雷达数据地表位移测量的贡献的方法。我们利用2008年5月28日四川地震的合成孔径雷达数据对该方法进行了检验。这些校正不仅可以更清晰地解释地表破裂，而且可以更准确地测量地表位移，这对基于L波段合成孔径雷达数据的地震模拟具有重要意义。
Ionospheric contributions to the phase of L-band synthetic aperture radar (SAR) signals put severe limitations on ground displacement measurements retrieved by either differential SAR interferometry or radar amplitude-image offsets. Such contributions result in an ionospheric phase screen on the differential interferogram and in directional fluctuations in the relative position of azimuth pixels on offsets maps. In this letter, we propose a procedure for estimating and removing ionospheric contributions to surface displacement measurements derived from L-band SAR data. We test the procedure on SAR data from the May 28, 2008 Sichuan Earthquake. The applied corrections allow both a clearer interpretation of the surface rupture and a more accurate measurement of the surface displacement, which has important implications in earthquake modeling based on L-band SAR data.