Refined Motion Compensation for Highly Squinted Spotlight Synthetic Aperture Radar

Inhalt:
This paper presents a motion compensation algorithm which is capable of dealing with large motion errors for highly squinted spotlight SAR. The approach consists of a phase error compensation, a shift to correct the delay time error and an interpolation/resampling in azimuth. For pulsed SAR with a 30deg squint angle, the proposed algorithm compensates motion errors that are 10 times greater than the resolution cells and obtains nearly the theoretical achievable resolutions of the focused image. The main contribution of this paper is the consideration of the effect of motion errors in the presence of a large squint angle.