Modified Auto-Focusing Algorithm for High Squint Diving SAR Imaging Based on the Back-Projection Algorithm with Spectrum Alignment and Truncation
The study focuses on addressing the image defocusing issue caused by motion errors in highly squinted Synthetic Aperture Glasses Radar (SAR).The traditional auto-focusing algorithm, Phase Gradient Autofocus (PGA), is not effective in this mode due to difficulties in estimating the phase gradient accurately from strong point targets.Two main reasons