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Spaceborne synthetic aperture radar (SAR) has been widely used in the national defense, geologic mapping, disaster estimation, and other fields. This technique has realized the technological leap forward from low-Earth-orbit (LEO) to medium-Earth-orbit (MEO)/geosynchronous-Earth-orbit (GEO) SAR imaging, single- to multichannel processing, the resolution level of the meter to submeter, and single to multiple imaging modes in recent years.
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Sun et al. (2021) studied this question.
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