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Method for implementing high-resolution wide-swath spaceborne SAR system
Method for implementing high-resolution wide-swath spaceborne SAR system
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机译:一种高分辨率宽波段星载SAR系统的实现方法
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摘要
The disclosure discloses a method for implementing a high-resolution wide-swath spaceborne Synthetic Aperture Radar (SAR) system, including steps of: adopting, in azimuth of a spaceborne SAR, a Multi-Input Multi-Output (MIMO) sliding spotlight mode for transmitting, by N sub-apertures, N chirp signals of different carrier frequencies, such that sub-band echoes received by the multiple sub-apertures are separated; and preprocessing, in azimuth, the separated sub-band echoes to resolve the back-folded Doppler spectrum caused by beam steering and a multi-channel structure of an antenna; performing range sub-band synthesis on azimuth preprocessed signals to obtain a synthesized signal with a bandwidth of N times of a bandwidth of a single transmitted chirp signal to achieve range high resolution; and performing residual focusing of the synthesized signal using a Range-Migration Algorithm (RMA) to obtain a final radar image with a high resolution.
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