Interferometric calibration method for spaceborne SAR based on independent parameter decomposition

doi:10.11947/j.AGCS.2019.20180128

Abstract

Abstract: The accuracy of interferometric parameters of InSAR plays a significant role in precise digital elevation model (DEM). However, interferometric parameters are traditionally calculated jointly, making them difficult to decompose precisely. It is proposed that an interferometric calibration method based on independent parameter decomposition(IPD) by the authors.Firstly, the parameters related to the interferometric SAR measurement are determined based on the three-dimensional reconstruction model. Secondly, the sensitivity of interferometric parameters is quantitatively analyzed after the geometric parameters are completely decomposed. Finally, each interferometric parameter is calculated based on IPD and interferometric calibration model is established. Weinan of Shanxi Province is taken as an example area. Four TerraSAR-X/TanDEM-X image pairs are used to carry out the interferometric calibration experiment. The results show that the elevation accuracy of all interferometric results are less than 2.54 m for this experimental data after interferometric calibration. Furthermore, the proposed method can obtain the accuracy of DEM products less than 1.21 m in the flat area and 3.11 m in the mountain area respectively.That results can prove the correctiveness and effectiveness of the proposed IPD based interferometric calibration method. The results could provide a technical basis for topographic mapping of 1:25 000 scale in the flat area and mountain area.

Key words: geometric calibration, interferometric calibration, three-dimensional reconstruction model, sensitivity analysis, independent parameter decomposition

CLC Number:

P236

FAN Jun, LI Tao, ZUO Xiaoqing, CHEN Qianfu, ZHANG Xiang, LU Jing. Interferometric calibration method for spaceborne SAR based on independent parameter decomposition[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(6): 737-746.

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