ERROR ANALYSIS OF BASELINE AND TERRAIN IN InSAR DATA PROCESSING USING ALOS PALSAR
Shen Qiang 1) ; Qiao Xuejun 2) ; Jin Yinlong 3) ; Wang Hansheng 1) ; and Jiang Liming 1)
1)State Key Laboratory of Geodesy and Earth’s Dynamics,Institute of Geodesy and Geophysics, CAS，Wuhan 430077;2)Institute of Seismology of China Earthquake Administration, Wuhan 430071;3)State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072
Abstract：Seeing that there are still many factors governing the accuracy of InSAR although they have appeared to good application in various field as earthquake, landslide,etc. this paper focus on the two sources of errors controlling the accuracy of InSAR.In the first place, theoretical analysis has been first made for the evaluation of influence of baseline and terrains errors on surface deformation.On the basis of above theoretical analysis, we estimated the influence of baseline errors and terrain errors on InSAR for ALOS PALSAR radar images without accurate orbit information. The spatial patterns of additional surface deformation due to the two error sources have also been retrieved. The results show that the orbit accuracy of ALOS PALSAR is 3-5 m, in which the displacements must be rectified for the low orbit accuracy.The simulation and experimentation all show that baseline is main error sources in the use of ALOS PALSAR and terrain errors is negligible. For the accuracy of better than 1 cm in deformation measurements, the length of baseline must be less than 400 m under current SRTM DEM if twopass interferometry was used.
Shen Qiang ,Qiao Xuejun ,Jin Yinlong et al. ERROR ANALYSIS OF BASELINE AND TERRAIN IN InSAR DATA PROCESSING USING ALOS PALSAR[J]. jgg, 2012, 32(2): 1-6.
