The effects of residual cubic phase error induced by Chirp Scaling algorithm on SAR image qualities are analyzed
and an SC-Chirp Scaling imaging algorithm for high resolution spaceborne SAR based on nonlinear FM filter is proposed in this paper.Squint equivalent range model is used
and a nonlinear FM filter method is applied to achieve cubic phase error correction in the algorithm.Computer simulation results are presented
which illustrate the algorithm having the capability to acquire evident improvement of high resolution spaceborne SAR image qualities.