Sparse signal processing has already been introduced to synthetic aperture radar (SAR). which shows potential in improving imaging performance based on raw data or a complex image. In this paper. the relationship between a raw data-based sparse SAR imaging method (RD-SIM) and a complex image-based sparse SAR imaging method (CI-SIM) is compared and analyzed in detail. https://www.relicsbook.com/product-category/autographed-hockey-photos/