Two-dimensional autofocus for SAR range migration algorithm

摘要

In this paper, the analytical structure of residual 2D phase error in RMA imagery is investigated. By incorporating the inherent phase structure knowledge, an efficient 2-D autofocus algorithm is proposed. The new approach estimates the 2-D phase errors in semi-blind manner, it offers clear advantages in both computational efficiency and estimation accuracy as compared with conventional blind 2-D autofocus algorithms.