A 2D Sub-aperture Algorithm for SAR with Stepped-chirp Signals
一种适用于调频步进信号SAR的2维子孔径处理算法

In this work, a 2D overlapped sub-aperture polar format algorithm (PFA) based on stepped-chirp signal is proposed. In synthetic aperture radar (SAR) with stepped-chirp signals, instead of using traditional pulse synthesis to conduct preprocess, the presented method integrates the pulse synthesis process into the range sub-aperture processing. Meanwhile, due to the multi-resolution characteristics of sub-aperture processing, this algorithm is able to compensate the space-variant phase error caused by the radar motion during the period of a pulse cluster. Finally, experiments carried out on simulated and measured data confirm the validity of the algorithm.