Bistatic InSAR interferometry imaging and DSM generation for TH-2

doi:10.11947/j.AGCS.2022.20210323

Abstract

Abstract: TH-2 is a bistatic synthetic aperture radar (SAR) satellite system in formation flight. Compared with traditional InSAR systems, it can eliminate decoherent sources such as time and atmosphere, besides, it can generate highly coherent SAR image pairs. This paper firstly describe the extended chirp scaling (ECS) imaging algorithm based on the hyperbolic equivalent method, and also introduces pre-filtering to deal with problems such as reduced coherence and interference phase errors caused by mixed baselines. Secondly, it introduces the interference processing method and the technical process of DSM reconstruction in the bistatic mode. Finally, an interference imaging experiment is performed using the original echo data of a certain mountainous experimental area, and the 3D reconstruction experiment is performed by using the generated SAR image pair, which analyzes the coherence of the image, the phase unwrapping results and the DSM reconstruction results. The experimental results verify that the interference imaging algorithm in this paper has good focusing effect and phase preservation capacity. At the same time, the interferometry and 3D reconstruction capabilities of the data are verified as well.

Key words: SAR interferometric imaging, InSAR process, DSM generation

CLC Number:

TN958
P236

XIANG Jianbing, Lü Xiaolei, FU Xikai, XUE Feiyang, YUN Ye, YE Yu, HE Ke. Bistatic InSAR interferometry imaging and DSM generation for TH-2[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(12): 2493-2500.

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