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《Chinese Journal of Geophysics》 2009-07
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A study on the maximum and minimum detectable deformation gradients resolved by InSAR

JIANG Mi~1,LI Zhi-Wei~(1*),DING Xiao-Li~2,ZHU Jian-Jun~1,FENG Guang-Cai~2,YIN Hong-Jie~11 School of Info-Physics and Geomatics Engineering,Central South University,Changsha 4110083,China2 Dept.of Land Surveying & Geo-Informatics,the Hong Kong Polytechnic University,Hong Kong  
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.
【Fund】: 国家自然科学基金项目(40774003 40404001);; 国家863项目(2006AA12Z156);; 教育部新世纪优秀人才支持计划(NECT-08-0570);; 国家西部1:50000空白区测图工程2007年度研究课题;; 地理空间信息工程国家测绘局重点实验室开放基金(200817)资助.
【CateGory Index】: P225.1
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