A coordinate-transform based FFBP algorithm for high-resolution spotlight SAR imaging

• 作 者: YANG ZeMin XING MengDao ZHANG Lei BAO Zheng
• 机 构: National Key Lab of Radar Signal Processing, Xidian University,
• 出 处: Science China(Information Sciences)
• 发表日期: 2015年02期
• 关键词: interpolation coordinate aperture projection chirp utilizing merging azimuth sce

This paper proposes a coordinate-transform(CT) implementation for the fast factorized backprojection(FFBP) algorithm(CT-FFBP) to process high-resolution spotlight synthetic aperture radar(SAR)data. Unlike the FFBP utilizing two-dimensional image-domain interpolation for sub-aperture fusion, CT-FFBP finishes the image-projection using CT with the accommodation of chirp-z transform and circular shifting. Without interpolation, CT-FFBP yields enhanced efficiency over the interpolation based FFBP, besides maintaining high precision simultaneously. Both simulation and real-data experiments verifies the efficiency and precision superiorities of the CT-FFBP.

Unlike the FFBP utilizing two-dimensional image-domain interpolation (FF-BPBP) to process high-resolution spotlight synthetic aperture radar (SAR) data for sub-aperture fusion, CT-FFBP finishes the image-projection using CT with the accommodation of chirp-z transform and circular shifting. Without interpolation, CT-FFBP yields enhanced efficiency over the interpolation based FFBP, except maintaining high precision simultaneously. Both simulation and real-data experiments verifies the efficiency and precision superiorities of the CT-FFBP.