Equivalent squint extended chirp scaling algorithm for spaceborne ScanSAR

To resolve the precise imaging problem of spaceborne Scanned-beam Synthetic Aperture Radar (ScanSAR) with large range cell migration, a novel Equivalent-Squint Extended Chirp Scaling (ES-ECS) algorithm is proposed. The full derivation and the realizing approach of the algorithm are presented with the squinted equivalent range model, which describes the relationship of spaceborne geometrical more precisely than the broadside range model. And the optimum look weighting approach is also introduced to avoid the scalloping effect. Finally, the algorithm is verified by simulations.