Abstract:The radar signal propagation delay caused by atmospheric effects, especially atmospheric water vapor content changing in time and space, is one of the main error sources in repeatpass interferometry SAR, which is difficult to eliminate and greatly limits the applications of differential interferometry SAR. When only GPS water vapor is considered for the atmospheric delay correction in InSAR, it is will be leading to poor effect of correction taking into account the impact of topography to atmospheric wet delay.The relationship between the terrain and vertical layered component of atmospheric wet delay was analyzed and a function model between them was established. On the basis of it, a new interpolation method is proposed, which takes into account the impact of terrain on atmospheric delay. The calculation results show that the new interpolation method has obvious advantages compared with IDW and Kriging methods.
Yang Chengsheng,Zhang Qin,Zhao Chaoying et al. ATMOSPHERIC DELAY ESTIMATION OF SAR INTERFEROGRAM BASED ON GPS OBSERVATIONS AND TERRAIN[J]. jgg, 2011, 31(1): 142-146.