Modifications of Range-Doppler Algorithm for Compensation of SAR Platform Motion Instabilities

Abstract

To address issues with SAR platform motion instabilities, two variations of the range-Doppler algorithm (RDA) have been put forward. In order to rectify radiometric inaccuracies, multi-look processing based on the RDA with an expanded Doppler bandwidth was first presented. Second, in order to apply the RDA in a newly created local-quadratic map-drift autofocus (LQMDA) approach, it has been adjusted to execute SAR image generation on short-time acquisition intervals. Using experimental data collected by aerial SAR equipment, the approaches' performance is shown.