Correction of DInSAR noise using GNSS measurements
Correction of DInSAR noise using GNSS measurements
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发表时间：
2013-09
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通讯作者：
Y. Fukushima
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作者：
Y. Fukushima
差分合成孔径雷达干涉图以高空间分辨率绘制地面位移。许多令人感兴趣的信号，例如地震和火山活动产生的信号，在空间上相互关联，而且常常被对流层和电离层波动、不准确的轨道数据以及数字高程模型中的误差所造成的人为现象所掩盖。在这项研究中，提出了一种方法来纠正这种空间相关的噪声差分SAR干涉图。这种方法依赖于一个普遍的事实，即用全球导航卫星系统测量的位移是足够准确的。所提出的方法被应用到一个数据集组成的长条（~230公里）的合成孔径雷达图像ALOS/PALSAR在近畿地区，日本。结果表明，长波长噪声被成功地抑制，这使我们能够讨论隐藏在原始干涉图中的短波长特征。
Differential SAR interferograms map the ground displacements with high spatial resolution. Many signals of interest, for example, those due to earthquakes and volcanic activities, are spatially correlated and are often obscured by artifacts caused by tropospheric and ionospheric fluctuations, inaccurate orbit data, and errors in the digital elevation model. In this study, a method to correct for such spatially-correlated noise in differential SAR interferograms is proposed. This method relies on a general fact that the displacements measured with the global navigation satellite systems are accurate enough. The proposed method is applied to a data set composed of long-strip (~230 km) SAR images acquired by ALOS/PALSAR in Kinki region, Japan. It is shown that long-wavelength noise is successfully suppressed, which enables us to discuss short-wavelength features that were hidden in the original interferograms.