Analysis of Ocean Tide Loading in Differential InSAR Measurements

Analysis of Ocean Tide Loading in Differential InSAR Measurements
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差分InSAR测量中的海洋潮汐载荷分析

DOI:
10.3390/rs9020101
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发表时间:
2017-01
期刊:
影响因子:
5
通讯作者:
Cao Yunmeng
Cao Yunmeng
中科院分区:
工程技术2区
文献类型:
--
作者:
Peng Wei;Wang Qijie;Cao Yunmeng

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海潮载荷(OTL)引起沿海地区地壳位移,在差分干涉合成孔径雷达(DInSAR)干涉图上,这些地面位移的相对变化可达几厘米。然而,轨道误差严重影响了长波长地壳形变信号的分析,如OTL效应,因为它们在DInSAR干涉图中具有相似的特征。为了校正轨道误差,采用线性曲面模型,将全球定位系统(GPS)精密单点定位(PPP)在视线(LOS)方向上的相对位移作为长波地壳形变信号的先验参数。在对轨道误差进行修正后,利用海潮模型对DInSAR干涉图中的OTL效应进行了修正。利用洛杉矶盆地的DInSAR干涉图对该方法进行了验证。实验结果证实,在先验参数的约束下,真实的轨道误差可以用双线性斜坡函数来建模。此外,在去除轨道误差后,长波长地壳形变信号中占主导地位的OTL效应可以被揭示出来,并被FES2004潮汐模型有效地消除。
Ocean tide loading (OTL) causes crustal displacements in coastal regions, and the relative variation of these ground displacements may reach several centimeters across differential interferometric synthetic aperture radar (DInSAR) interferograms. However, orbit errors seriously affect the analysis of long-wavelength crustal deformation signals such as the OTL effect because of their similar signatures in DInSAR interferograms. To correct the orbit errors, we used a linear surface model to model the relative displacements of the Global Positioning System (GPS) precise point positioning (PPP) in the line of sight (LOS) direction as a priori parameter of the long-wavelength crustal deformation signals. After correcting the orbit errors, an ocean tide model was applied to correct the OTL effect in the DInSAR interferograms. The proposed approach was verified with the DInSAR interferograms from the Los Angeles basin. The experimental results confirm that the real orbit errors can be modeled by the bilinear ramp function under the constraint of the priori parameter. Moreover, after removing the orbit errors, the OTL effect, which is dominant in the long-wavelength crustal deformation signals, can be revealed, and then be effectively eliminated by the FES2004 tide model.
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