VALIDATION OF POINT SCATTERER PHASE STATISTICS IN MULTI-PASS INSAR
VALIDATION OF POINT SCATTERER PHASE STATISTICS IN MULTI-PASS INSAR
复制标题
多程 INSAR 中点散射体相位统计的验证
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Nl
中科院分区：
文献类型：
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作者：
G. Ketelaar;P. Marinkovic;R. Hanssen;Nl
在雷达图像中，点散射体提供的反射通常可归因于单个物理对象，通常小于分辨率单元尺寸。随着时间的推移，具有高反向散射系数的稳定点散射体（主要是“人造特征”）是 InSAR 变形分析的潜在目标。有关 InSAR 点散射体测量观测统计的先验知识对于给出估计（变形）参数的独立质量描述是必要的。使用 SAR 图像的信噪比 (SCR)，可以获得相位方差的先验估计。已经建立了一个受控角反射器实验，其中水准测量作为一种独立的验证技术。 2003年3月至2004年6月期间，使用水准仪和重复通过InSAR（ERS-2和Envisat）对代尔夫特理工大学附近地区的五个角反射器的运动进行了监测。双差观测是第一个具有可解释信息的观测，用于比较 InSAR 和水准测量。随机模型被设置为方差协方差矩阵，估计观察组 leveling、ERS-2 和 Envisat 的后验方差因子。从结果可以得出结论，基于 SCR 的先验相位方差
In radar images, point scatterers provide re∞ections that can often be attributed to a single physical object, usually smaller than the resolution cell size. Stable point scatterers with high backscatter coefflcients through time (mainly ’man-made features’) are potential targets for InSAR deformation analysis. A-priori knowledge about the observation statistics of InSAR point scatterer measurements is necessary togiveanindependentqualitydescriptionoftheestimated (deformation) parameters. Using the Signalto-Noise Ratio (SCR) from SAR images an a-priori estimate of the phase variance can be obtained. A controlled corner re∞ector experiment has been set up with leveling as an independent validation technique. In the period from March 2003 to June 2004 the movements of flve corner re∞ectors in the area near Delft University of Technology have been monitored using leveling and repeat-pass InSAR (ERS-2 and Envisat). Double-difierence observations, the flrst observations that bear interpretable information, are used for comparing the InSAR and leveling measurements. The stochastic model is set up as a variancecovariance matrix, estimating a-posteriori variance factors for the observation groups leveling, ERS-2 and Envisat. From the results it can be concluded thatthea-prioriphasevariancebasedonSCRforthe