High-Resolution SAR Image Generation by Subaperture Processing of FMCW Radar Signal

In this letter, we present a subaperture-based processing scheme for synthetic aperture radar (SAR) imaging using frequency-modulated continuous-wave (FMCW) radar transmission. An efficient two-stage azimuth subaperture processing scheme is proposed for high-resolution SAR image generation. A new bulk range-cell-migration-correction technique is proposed. The algorithms are validated with point target simulations at the X-band and also using real data samples at the C-band. The results show that subaperture-based processing can be used to image extended ground scenes without mosaicing.