Main and auxiliary SAR image fusion method of distributed satellite SAR system

The invention belongs to the technical field of SAR image azimuth resolution ratio improvement and particularly relates to a main and auxiliary SAR image fusion method of a distributed satellite SAR system. The main and auxiliary SAR image fusion method comprises the specific steps of Doppler spectrum envelope correction, radar geometric method based image registration, terrain phase inversion, registration error and residual phase deviation estimation based on an SAR image maximum contrast ratio method, main and auxiliary SAR image fine registration and phase deviation correction and Doppler spectrum splicing. The main and auxiliary SAR image fusion method can conduct effective image fusion on main and auxiliary SAR images so as to improve azimuth resolution ratio and meet the performance requirement of high-quality InSAR processing under the situation that the Doppler spectrum overlapping degree of the distributed satellite SAR system along a long base line of the course approximates to zero.