Analysis and correction of ionospheric dispersion effect in spaceborne bistatic InSAR system

doi:10.7523/j.issn.2095-6134.2021.06.011

Abstract

Abstract: The images of single-pass InSAR are acquired at the same time, so it has been claimed that the images of spaceborne bistatic single-pass InSAR system is not affected by the ionosphere since the ionospheric phase can be removed by the interferometric processing. However, it has been revealed that the images of spaceborne bistatic single-pass InSAR system are still affected by the ionosphere in recent researches, such as group delay, phase advance, scintillation, and Faraday rotation. It is different from the repeat-pass system that the ionosphere effect in bistatic single-pass InSAR system is caused by the slight incidence angle difference in the two SAR and the TEC gradient. In this paper, we first analyzed the ionospheric dispersion effects in bistatic single-pass InSAR system, and then improved and simulated the range split-spectrum method in the bistatic single-pass InSAR system. It is found that the ionospheric phase in interferogram can be removed by the range split-spectrum method, and this research result has high practical value for the Lutan-1 which will be launched soon.

Key words: synthetic aperture radar interferometry (InSAR), ionosphere, dispersion effects, spectrum split

CLC Number:

TN957

LIN Shiming, ZHANG Yi, WANG Jili, ZHAO Shuang. Analysis and correction of ionospheric dispersion effect in spaceborne bistatic InSAR system[J]. Journal of University of Chinese Academy of Sciences, 2021, 38(6): 809-816.

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