A study on the maximum and minimum detectable deformation gradients resolved by InSAR
A study on the maximum and minimum detectable deformation gradients resolved by InSAR
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InSAR分辨最大最小可检测形变梯度研究
DOI：
10.3969/j.issn.0001-5733.2009.07.006
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发表时间：
2009-09
影响因子：
1.4
通讯作者：
Jiang Mi
中科院分区：
文献类型：
--
作者：
Zhu Jian-Jun;Li Zhi-Wei;Yin Hong-Jie;Feng Guang-Cai;Ding Xiao-Li;Jiang Mi
SAR干涉图中的相位噪声是干涉相干性和多望数的函数。在InSAR中，除硬件限制外，最大和最小可探测变形梯度直接受到干涉相位噪声的影响。此外，多视操作将改变像素的大小，从而改变最大和最小可检测的变形梯度。研究了最大/最小可探测变形梯度、多视数和相干性之间的关系，建立了多视数1、5和20的最大/最小可探测变形梯度的经验函数模型。伊朗Barn地区Envisat ASAR数据的实验结果表明，新模型可以准确判断InSAR是否可以分辨给定的地面变形。与仅包含相干信息的模型相比，新模型更加准确和全面。
The phase noise in a SAR interferogram is the function of both interferometric coherence and muhilook number. In InSAR, except the hardware limitation, the maximum and minimum detectable deformation gradients are directly affected by interferometric phase noise. In addition, multilook operation will alter the size of pixels and thus the maximum and minimum detectable deformation gradients. This paper investigates the relationship among the maximum/ minimum detectable deformation gradient, the multilook number and the coherence, and establishes the empirical function models of the maximum/minimum detectable deformation gradients for multilook number 1, 5 and 20. Experimental results with Envisat ASAR data over the area of Barn, Iran show that the new models can accurately judge whether a given ground deformation can be resolved by InSAR. Comparing with the model incorporating only coherence information, the new model is more accurate and comprehensive.