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首页> 外文会议>European Association of Remote Sensing Laboratories Symposium >Qualitative distinction between terrain deformations and processing errors, and quantitative description of deformations for the 3-pass interferometry
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Qualitative distinction between terrain deformations and processing errors, and quantitative description of deformations for the 3-pass interferometry

机译：地形变形和处理误差之间的定性区别，以及3通干扰测量的变形的定量描述

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The 3-pass interferometry means that we use three scenes where one pair (topo pair) is considered to have no influence on a deformation. The DEM is already derived in radar coordinates from this pair, and consequently this influence is also subtracted from deformation pair (deformation pair). The topo interferogram must be unwrapped first and then rewrapped in order to have the same height ambiguity as the deformation interferogram. This method is used to remove the topographically induced phase from the interferogram containing topography, deformation and atmosphere. The perpendicular baseline of the topo pair should be longer than that of the deformation pair to prevent that noise is multiplied. The advantage of the 3-pass interferometry is the fact that the whole processing is performed in the master slant range coordinate system and only the coregistration of complex SAR images is necessary. Both pairs (topo and deformation pair) have the same master scene.When used for deformation mapping, the perpendicular baseline should be as short as possible in order to reduce the topographic signal in the interferogram as much as possible. The temporal baseline should be long enough to allow the deformations to occur, but the deformations cannot be too large. If the deformation slope exceeds 2.8 cm, phase unwrapping is very unreliable, and these deformations also cause decorrelation, especially when occurring in the azimuth direction. There are many spots (patches) in an interferogram which need to be verified in other interferograms. In this paper, we take two cases of topo pair into account. We changed master and slave scenes in the topo pair, and obtained two results for the phase of the differential interferogram. Then we can compare both phases and make conclusions if an expected subsidence or landslide occurs there.
机译：3遍干涉测量法意味着我们使用三个场景，其中一对（Topo对）被认为对变形没有影响。 DEM已经来自该对的雷达坐标，因此这种影响也从变形对（变形对）中减去。 Topo干涉图必须首先未包装，然后重新包装，以便具有与变形干扰图具有相同的高度模糊性。该方法用于从包含地形，变形和大气的干涉图移除地形诱导的相位。 Topo对的垂直基线应长于变形对的基线，以防止省略噪声乘以。 3-Pass干涉测量法的优点是在主倾斜范围坐标系中执行整个处理，并且仅需要复杂的SAR图像的核心简要。两对（Topo和变形对）具有相同的主场景。用于变形映射时，垂直基线应尽可能短，以尽可能地降低干涉图中的地形信号。时间基线应该足够长，以允许变形，但变形不能太大。如果变形斜率超过2.8cm，则相位展开非常不可靠，并且这些变形也导致去相关，尤其是在方位方向上发生时。在其他干涉图中需要验证的干涉图中有许多斑点（补丁）。在本文中，我们考虑了两个Topo对的情况。我们在Topo对中更改了主站和从场景，并获得了差分干扰图的阶段的两个结果。然后，如果发生预期沉降或滑坡，我们可以比较两个阶段并得出结论。

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