CA-ECS Algorithm for Squinted SAR Imaging Based on Constant Acceleration Model

This paper concentrates on accurate motion compensation method for airborne SAR in diving model.The equivalent squint range model is deduced in the case of constant acceleration movement and CA-ECS(Constant Acceleration-Extended Chirp Scaling) imaging algorithm is proposed with new phase compensation factors based on this range model.The influences of multi-directional velocities and accelerations are taken into account in phase(compensation)factors of CA-ECS algorithm,so motion compensation with acceleration can be achieved via phase (compensation).This algorithm is a more versatile and applicable imaging algorithm for subaperture data.The computer simulation results illustrate that the squint range model has less error and CA-ECS algorithm can be used to accomplish motion compensation with acceleration efficiently.