Analysis of interferometric mapping accuracy for spaceborne distributed SAR dual-frequency alternative bistatic mode

doi:10.11947/j.AGCS.2024.20220657

Abstract

Abstract: Due to flexible baseline and minimal temporal decorrelation, spaceborne distributed synthetic aperture radar (SAR) systems have been rapidly developed and widely applied in interferometric mapping. Dual-frequency alternative bistatic mode is an emerging mode, it can simultaneously acquire multiple SAR images at two frequencies compared with the conventional mode, which enables higher accuracy of interferometric mapping. In this paper, the fundamental of dual-frequency alternative bistatic mode is briefly introduced. Then, the phase ratio relationship and coherence characteristics of SAR interferometric pairs in this mode are investigated in depth, and the interferometric phase accuracy and mapping accuracy are analyzed theoretically, which provides a theoretical basis for the design of the SAR systems and the study of the interferometric processing. Finally, simulation results demonstrate the superiority of the dual-frequency alternative bistatic mode over the conventional mode. This mode can increase the interferometric phase data of different frequencies, thereby improving the accuracy of interferometric mapping.

Key words: spaceborne distributed synthetic aperture radar, InSAR, dual-frequency alternative bistatic mode, interferometric mapping analysis

CLC Number:

P237

WANG Yuan, XU Huaping, LI Chunsheng, ZENG Guobing, LIU Aifang, GE Shiqi. Analysis of interferometric mapping accuracy for spaceborne distributed SAR dual-frequency alternative bistatic mode[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(3): 463-472.

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