Synthetic aperture radar (SAR) sliding spotlight work mode can achieve high resolutions and wide swath (HRWS) simultaneously by steering the radar antenna beam.This paper aims to obtain well focused images using sliding spotlight Liebherr IKBP2760 BioFresh Performance 140cm Built In Integrated Larder Fridge mode with the Chinese Gaofen-3 SAR sensor.We proposed an integrated imaging scheme with sliding spotlight echoes.In the Vacuum imaging scheme, the two-step approach is applied to the spaceborne sliding spotlight SAR imaging algorithm, followed by the Doppler parameter estimation algorithm.
The azimuth spectral folding phenomenon is overcome by the two-step approach.The results demonstrate a high Doppler parameter estimation accuracy.The proposed imaging process is accurate and highly efficient for sliding spotlight SAR mode.