Motion compensation for high-resolution automobile-SAR

This article concerns the analysis and compensation of track deviations in high-resolution automobile synthetic aperture radar (SAR). We establish the geometry in which the automobile-SAR raw data is acquired. Based on the derived model, the research investigates the impact of track deviations on the final focused image quality and we propose a motion compensation strategy which can be applied to obtain a well-focused SAR image. This article presents how to obtain the accurate positions of the antenna phase centre using the velocity and attitude angles measured by inertial navigation system/global positioning system, and proposes a new method to compensate for forward velocity errors which are decomposed into two components and compensated individually, that is, high-order and low-order phase compensation. Finally, the results from both simulated data and real data are presented to validate the whole analysis and the proposed procedure.