Analysis of Tropospheric Effects on Spaceborne Single-Pass SAR Interferometry
It is often considered that spaceborne single-pass interferometric synthetic aperture radar(InSAR)is not affected by tropospheric propagation effects,since the master and slave images are obtained almost simultaneously and neednt to resolve the problem of temporal decorrelation.However,due to the fact that slightly different incidence angles cause different propagation paths,the troposphere may result in a notable height error for single-pass InSAR systems.In this paper,the tropospheric propagation delay is divided into the common delay and the differential delay,and the corresponding height errors caused by the two delays are presented.Then,the absolute and relative height errors caused by troposphere for the flat and rough terrains are analysed using the proposed theoretical framework.Theoretical analysis shows that,when the swath width is 100km,the relative height and plane errors caused by the troposphere are 1.07m and 1.07m for the flat terrain,and 1.07m and 1.87m for the rough terrain.Moreover,comparisons between the results obtained under the two-dimensional baseline model and the three-dimensional one show that the twodimensional baseline model is accurate enough for real data analysis with less complexity.This paper can provide some theoretical basis for the correction of the tropospheric effects in spaceborne single-pass SAR interferometry.
single-pass InSAR tropospheric effects the three-dimension baseline the height offset common delay differential delay
Hanzhi Zheng Anxi Yu Qilei Zhang Yongsheng Zhang Zhen Dong
College of Electronic Science and Engineering,National University of Defense Technology,No.109 De Ya Road,410073,Changsha,China
国际会议
重庆
英文
492-497
2017-03-25（万方平台首次上网日期，不代表论文的发表时间）