Synthetic aperture radar processing using a novel implementation of fast factorized back-projection

Due to the heavy computational complexity, the efficiency of FFBP algorithm descends obviously. Thus, an approximate FFBP algorithm is proposed in this paper. With the imaging plane on the r - sinθ coordinate system, there is no need to calculate the arcsines of the back-projected angle. Meanwhile, the polynomial estimation method is introduced to obtain the approximate values of back-projected slant range and angle. As a result, the number of operations is further reduced. A detailed analysis of computation burden is given as well. At the end of the paper, dealing with the data of different wavebands, the simulation result of the point targets shows that the algorithm proposed is accurately and effective to give well focused images.